Bike Gear Calculator No idea on cadence, but it was high -- not 218 RPM, though! Gear If you multiply the primary gear ratio by the internal ratios for the highest and lowest gears, you get the following high and low ratios: Highest ratio: 2.5 * 1.467 = 3.668 Lowest ratio: 2.5 * 0.279 = 0.698 These numbers can now be compared directly to the ratios of derailleur gear combinations to compare the hardest and easiest gears. If you want to customize the colors, size, and more to better fit your site, then pricing starts at just $29.99 for a one time purchase. Beyond the big ring: Understanding gear ratios and why ... And for what it's worth, Gear Inches is the equivalent diameter of a penny farthing (or unicycle) wheel to the gear ratio selected. This handy little calculator can tell you that plus many more combinations! Like this: a 42 front x 21 rear: 42/21 = 2. a 36 front x 18 rear: 36/18 = 2. Enter Shift at RPM, select gear to shift to and hit Shift and Trace to run up through the gears recording shift point RPM and km/h - mph. I read Sheldon Brown's gain ratio definition. Here is my interpretation: Calculating Gear Inches takes wheel size into account. 1.25 1.5 1.75 1.95 2.00 2.10 2.125 2.20 2.25 2.30 2.35 2.40  other in. 24×1.75. 34 ÷ 32 = 1.06. Bike gears calculator allows you to choose cadence, tire size, crank length and more and determine gear ratio, gain ratio, speed, pedal rotations and much more. Bike eager : "I wrote to the developer, asking that he had cassette cogs up to 50 teeth, and he did it within … Comprehensive bicycle gear calculator 7 different tabs to choose from. The key element that will determine how hard you work is the difference in the number of teeth (the wee pointy bits that hook through the gaps in your chain) between the front chainring at the front and your selected rear cog. Gear ratio speed calculator bike Gear ratio speed calculator bike Brompton bikes can also be fitted with a 44t chainring reducing the ratios by 18% for very hilly conditions. Gear Ratio Speed Calculator. Table below: Shows table of all possible chainring/sprocket combinations with gear ratio. Change the cog in back, or the chainring in front, (or both), to achieve the desire ratio. Enter gear ratios, primary ratio, sprocket sizes and tire diameter, then drag RPM slider to calculate speed from RPM. Measure up the outer diameter of your rear wheel and work out your rollout. You'll need Excel to use it, though. Instead of referring to gear ratios, most cyclists express chainring and cog combinations by their respective number of teeth- 52/16, for example. On the more important point of touring bike gear ratios, you are best using a gear metric that is useful for comparison. This yields an 18.5 MPH speed at 90 RPM and allows for good acceleration and climbing. Get Bike Gear Calculator - Bike Gears, Cycling Gear Calculator, Bicycle Gear Calculator for iOS latest version. Classic BMX gearing evolved over the years to be 44/16 on most pro sized 20″ BMX bikes, which works out to approximately 55 gear inches. The RPM calculator should be used as a guideline for comparative purposes only. So if 50/13 is the biggest gear you need, that's a ratio of 3.85. Range: The difference between highest gear ratio and lowest gear ratio (high divided by low) expressed in percent. It is powered by a 124 cc BS-VI engine and has a user reported mileage of 45 kmpl. (mm)” boxes. Knowing your bike’s gear-inch measurement allows you to make better decisions when customizing your gearing. The quick ratio calculator exactly as you see it above is 100% free for you to use. If you know their numbers, just input them below and we’ll calculate it automatically for you! When you’re done using this page, check out my new bicycle gear ratio comparison page!Thanks for visiting! Fixie The measurement you will use depends on which measure is used for the bike, or rather which standard applies to the new bike. Bicycle Gears app helps you to determine whether you have the right bike but the wrong gears. This form allows you to calculate final drive ratios as well as see a comparison of speeds and RPMs within operating ranges of the vehicle. On the bike I ride this is 34 teeth at the front and 32 at the back – so really close. Bicycle Calculator - Graphically compare the frame size and geometry of different bicycles / calculate gear ratios, cadence and speed. The Couch Potato and Swank 65 Mountain Bike Races will be held Saturday and Sunday November 13 and 14 in Brevard, NC. Customize the bike gears calculator app to match your bike specs. Fixie If you know their numbers, just input them below and we’ll calculate it automatically for you! If you have any questions post them in this thread. Top. As I want to retain the spread of gears I'm not sure whether a 1 x 11/12 will do the job. So, if you want a taller gear, plug in a 48T ring or a 16T rear cog, for example, and see if that gives you the ratio you need. A 26″ 11-speed bike will have gears as low as 26-105″ and a 700c bike will go as low as 27-111″. Bicycle Gear Ratio Comparison Calculator How does a 3×9 compare to a 2×10 or 1×11 drivetrain? If you're using a Schlumpf Drive plus an internal-gear rear hub you should enter the actual number of teeth of the front chainring for the first chainring, and this number of teeth times the Schlumpf ratio for the second chainring. Let’s take my bike as an ex… Gear inches = wheel diameter in inches * (number of teeth in front chainring)/ (number of teeth in rear sprocket). Therefore a 26″ 8-speed bike will have gears as low as 26-79″ and a 700c bike will go as low as 27-84″. I've included a link to an online calculator later in the article. Also calculated is the new gearing you would need in order to return back to your original gear ratio when going to a bigger or smaller tire. Bike Gears calculator Calculates gear ratio of your setup and converts it to 26inch wheel setup (can be turned off in options) to be able to compare gear ratios among different wheel … Gears.mtbcrosscountry.com DA: 25 PA: 25 MOZ Rank: 89 You can either look at the decimal number, or you can multiply by a nominal wheel diameter in inches: 29 for a fat 700c wheel, 27.5 for a fat 650B wheel, or 26 for a fat 26-inch wheel. The original calculator page is here. 3 and 6 speed systems use a 50T chainring to give a wider overall range. The Sharpe Ratio is a commonly used investment ratio that is often used to measure the added performance that a fund manager is said to account for. The bicycle gear calculator displays graphically the gearing of derailleur gears and gear hubs. I went to Sheldon Brown's gear calculator. Contact Us. 24×1 3/8. Development = the distance (in inches) your wheel travels for one revolution of the pedals in any particular gear. Gear inches , or if your country has not put a man on the moon, gear development are the two most common metrics. Gear Calculator Dealer Locator Dealer Login. Bicycle Gears app helps you to determine whether you have the right bike but the wrong gears. Chainstay length: This distance is measured from the center of the BB to the center of the axle. The program will also calculate speed based on engine RPM, drive ratio,and wheel diameter. Currently, a third-party two-wheeler insurance policy is mandatory under the Motor Vehicle Act 1988. Use our tire size comparison calculator to find all your tire comparison needs. How to calculate bicycle gear ratio? It’s been modified along the way to a point we are extremely happy with the result and even converted it into an App for iPhone and iPad. The 16+ options give you a much more even progression through the gears. You can also create complete gear charts for your bike that you can store or share by email. 'Gear ratio' defines the number of drive shaft revolutions per propeller revolution. This is comparable to your 1×10 Front 30 rear cog 16 (4th gear) ratio 1.875. Contact Us. Frame size guide for mountain bikes (MTBs) Mountain bikes are generally designed to be more comfortable. You can try various combinations to come up with an appropriate combination of ring and pinion gear ratio and tire diameter for your vehicle. Why Traveling Cyclists Care Gear inches give you a way to compare the distance you travel with one revolution of the crank. Historically, bikes were fixed gear, meaning one revolution of the pedals was equal to one revolution of the back wheel, for a 1:1 ratio. Have fun! I'm try to compare the gear ratio of a IGH (Shimano Alfine 11) with a 10 speed cassette + 3 chainring setup. This would be the opposite end, the small ring on the front and the biggest on the back. Moving your mouse over the ratio will show speed you will achieve by pedaling at 100 rpm. Input your stock and new tires sizes along with your original gear ratio. It is common for 200-HP engines to have a ratio of 1.86:1. Enter Diff + Gear Ratios and Tire Diameter, then drag RPM slider to calculate speed from RPM. 87,982 in India. #1 Bike Gear calculator App. The program allows for up to three ratios in series. Two Wheeler Insurance or Bike Insurance is a plan that protects the owner of a bike from any possible damages in case of an accident, theft or natural disaster. It can in fact be said that front chainrings provide a wider gear ratio range, while rear sprockets provide differences in gear ratios of adjacent gears. So a 42T chainring with an 11-40 cassette would give you the gears you need. This form allows you to calculate final drive ratios as well as see a comparison of speeds and RPMs within operating ranges of the vehicle. 1 and 2-speed bikes come as standard with a 54t Chainring giving gears matched for speed. IE, pushing a ratio with 20 gear inches would feel the same as pedaling a unicycle with a 20" wheel. by brad.herder@gmail.com | posted in: Uncategorized | 0. Use the RPM calculator to determine what RPM your engine will run based on gear ratio, tire diameter, transmission and MPH. If you carry this to the extreme, the hub manufacturers' system would consider a singlespeed bike to have a gear "range" of 100%! To keep with the times Daryl has updated his chart to include … Apart from prices, you can also find comparison of these bikes based on displacement, mileage, performance, and many more parameters. Both relate to the size that a penny farthing wheel would need to be to produce the same gearing. This gear calculator should help you with the design of the derailleur system on your bicycle. Colors group similar values. New Pinion users often find themselves wondering which size front or rear sprockets to use with their Pinion gearbox, or how to compare Pinion gearing setups with a derailleur bike. For example, at 34-tooth chainring and 17-tooth rear cog have a 2:1 gear ratio. We’ve employed smaller chainrings with a consistent 13T difference, while giving the cassettes a 10T-start for wider range (up to 10-36, or 360%! 3+ is green, 2-3, blue, and below 2, red. About Us Introduction Why MFactory? ). Drag Max RPM slider to adjust the range of the RPM and km/h Gauges. Customize the bike gears calculator app to match your bike specs. #2. High gear ratios are useful when you’re moving quickly, such as in a sprint. gear ratio This is used to compare gearing. While you're at it, have a look at our RPM Calculator. The comparison in the Diff column is made between your chosen 1x cassette (orange), and the blue cells from your 2x setup. Gear Inches of Brompton with Single Speed, 2 Speeds, 3 Speeds and 6 Speeds. Bicycle Gears app helps you to determine whether you have the right bike but the wrong gears. As an all-around trail bike or for cross-country use, we still give the edge to alternatives like the Giant Talon or Co-op Cycles 1.2 above, but the Diamondback Line offers a compelling mix of toughness and price. Such a gearbox could provide a range of gears from 25 to 75 inches, or from 33 to 100, or any other 3:1 range that's altogether higher, lower, or in-between. Also take a look at our complete bicycle gear ratio chart below to see how your size compares to other gearing options. Be sure to measure the outside diameter of your wheel for accurate results. I'll calculate the best chainring/cog combinations and skid patches for your speed and cadence and what your speed will be at various cadences. Graphically compare the effects of cadence / gear calculating speed. 1 25 1 5 1 75 1 95 2 00 2 10 2 125 2 20 2 25 2 30 2 35 2 40 â ƒother in. Unique Ring the bell option. Gear Ratio: The final drive ratio that you would like to achieve. Bike eager : "I wrote to the developer, asking that he had cassette cogs up to 50 teeth, and he did it within a week. Hang on to your sanity as long as you can and stay well. 26 Mar 2020. Bicycle is driven by transferring pedaling force to the rear wheel. Bicycle Gear Ratio Chart & Calculator. This yields an 18.5 MPH speed at 90 RPM and allows for good acceleration and climbing. Our only motto happy customers. So a 42 x 21 and a 36 x 18 is the same goddamned gear. As such, if an engine has a gear ratio of 2:1, the engine drive shaft will turn twice for every propeller revolution. 2435. Surly ECR, 29+, Rohloff (34txRohloff 14s) 18.1 gear inches. Couch Potato and Swank 65 Mountain Bike Races. It's just a matter of choosing a number of teeth for Gear Inches are used to give a numerical value to how a particular front chainwheel, rear cog and tire combination will feel. For example, on a road bike with 18 gears, there are 2 chainrings and 9 cogs. Bicycle trail, the virtual line where the steering axis intersects the ground relative to the tyres contact point with the ground. The RPM calculator should be used as a guideline for comparative purposes only. Download Bike Gear Calculator - Bike Gears, Cycling Gear Calculator, Bicycle Gear Calculator App 1.5 for iPhone free online at AppPure. If you would like to compare it to a ratio you currently have, you can enter in your front chainring and rear sprocket. X-Range achieves wider range and tighter jumps by going to a 12-speed cassette, but also by moving some of the gear range from the front of the drivetrain to the back. In this setting, a minor difference in gear ratios (0.1m/1 gear inch) can affect how easily the rider can accelerate and the maximum speed … (Actually, I just checked an online cadence calculator, which suggests I was maybe doing 148 RPM.) Pinion gearing can be easily compared to external gearing using the internal gear ratios for the gearbox and the size of the front and rear sprockets. 3+ is green, 2-3, blue, and below 2, red. The speedometer will display 1 needle for each sprocket set. Thanks!" A SRAM 10-42 cassette has a very similar gear range, but with a 32T chainring the lowest gear has a ratio of 32/42 = 0.762 and the highest gear has a ratio of 32/10 = 3.200. Unique Ring the bell option. The two most commonly used measures of how big a gear is are the inch ratio, and the metre ratio. Have fun! Multiply the external (primary) gear ratio (front sprocket tooth count divided by rear sprocket tooth count) by the internal gear ratio (from the chart below) to get the overall ratio for a given gear selection. The ratios are 0.40 for the Mountain Drive, 1.65 for the Speed Drive, and 2.50 for the High Speed Drive. Low gear ratios move your wheel more slowly but with increased torque, ideal for climbs. It can be used to compare different setups to find the optimal gearing for all kinds of bicycles. If you have fewer just leave the unused ratios set to 1:1. Brompton folding bikes come in 4 gearing options, including the single speed, 2 speeds, 3 speeds, and 6 speeds. ‎#1 Bike Gear calculator App Only App Optimised for your latest bikes. Our tire size comparison calculator takes two tire sizes and directly calculates the differences between the tires diameter, width, sidewall, circumference and revolutions per mile. Gear Ratio Calculator. All level Cyclists now have access to an exciting new Bicycle Gear Calculator application. As an example from one of my bikes, if you have a 46t chainring and a 16t cog, dividing 46 by 16 gives you 2.875 which is a first multiplier. Details Gears on a bike make your rear wheel seem larger or smaller. The most common BMX gear charts are measured in gear inches. Simply put, your gear ratio compares the number of teeth in your front chainring to the number of teeth in your rear chainring. Bike Gears calculator You can add several bikes and compare side to side. Sharpe Ratio Definition. To check the gearing, count the teeth on the cogs and chainrings and create a chart with the rings on top and the cogs on the side. Choose your ideal gearing for your make of hub / gearsets / power or riding style. You can move the gear ratio up or down, but there is nothing practical you can do to change the overall ratio span (range) — unless you change the geared hub. So, moderate speed but reasonable hill climbing too. We started to create the bmxultra.com BMX Gear Calculator over a decade ago. The first quantity listed for each model is the overall range in percentage terms. Imagine riding on a flat, approaching a hill. Hi! Comparison between these bikes have been carried out to help users make correct buying decision between … The smallest bike gear ratio calculator is used when "climbing" (the smallest gear on the front plate corresponds to the largest gear on the rear flywheel). Request yours to be added as well. Bike gears calculator allows you to choose cadence, tire size, crank length and more and determine gear ratio, gain ratio, speed, pedal rotations and much more. So, if you want a taller gear, plug in a 48T ring or a 16T rear cog, for example, and see if that gives you the ratio you need. Graphically compare the effects of cadence / gear calculating speed. But the bike industry collectively decided to apply its own definition.) Bike gears calculator allows you to choose cadence, tire size, crank length and more and determine gear ratio, gain ratio, speed, pedal rotations and much more. Gear Ratios In simple terms, a gear ratio on a bike refers to how many times the back wheel will rotate for each full turn of the crank arms (pedals). If we have a chainring with 30 teeth and a sprocket with 30 teeth, there is no difference between the two; one full revolution of the pedals will result in one full revolution of the wheel. If you had to change to 30T chainring on the SRAM drivetrain, you would achieve similar gear ratios as the Shimano XT of 30/42 = 0.714 and 30/10 = 3.000. Cassettes marked with an * are made using either a OneUp 16+40 or 16+42 or Wolf Tooth 40 or 42 tooth conversion; The 16+ options give you a much more even progression through the gears This calculator is useful for planning your rig, allowing you to see what kind of performance to expect from different combinations. Gear Ratio. Transmission 1 - … Bicycle trail, the virtual line where the steering axis intersects the ground relative to the tyres contact point with the ground. Cadence is the number of revolutions of the crank per minute, this is the rate at which a cyclist is pedalling/turning the pedals. Min ratio: Ratio of the lowest gear of your setup. Gear inches = wheel diameter in inches * (number of teeth in front chainring)/(number of teeth in rear sprocket). The highest gear ratio is 28t with 12t; a ratio of 2.33:1. With 34/32 your smallest gear ratio, that's 1.06. Also calculated is the new gearing you would need in order to return back to your original gear ratio when going to a bigger or smaller tire. Not too long ago, Switchback Bikes posted an excellent gear ratio comparison chart that was put together by Daryl Smith. Enter Shift at RPM, select gear to shift to and hit Shift and Trace to run up through the gears recording shift point RPM and km/h - mph. Niner RLT 9 Steel, 700c/35mm, 2×11 (36x32t) 30.6 gear inches. Be sure to measure the outside diameter of your wheel for accurate results. It is available in 4 variants and 7 colours. Enter Shift at RPM, select gear to shift to and hit Shift and Trace to run up through the gears recording shift point RPM and km/h. Bicycle gear ratios speeds explained. You can try various combinations to come up with an appropriate combination of ring and pinion gear ratio and tire diameter for your vehicle. 78,564 - Rs. The Meaning of Ratio Calculator Top Ratio Calculator Secrets . Proposed by Sheldon Brown. When pedals are turned, front chainring draws the chain, which goes over the rear sprocket, turning it along with the rear wheel. Optimize your bike to suit your style. Description. Smaller gear inches mean more gear reduction. For anyone interested, I reworked my Excel gear calculator, with more information and, I think, easier to use. (I know- range should be [high-low]/low. The most popular gear ratios are pretty close to a 55 inch, which just seems to feel best for most people. The number is derived from a simple formula: (chainring size / cog size) X wheel size . Another popular unit for measuring gearing is Roll Out in inches. Bicycle Calculator - Graphically compare the frame size and geometry of different bicycles / calculate gear ratios, cadence and speed. However, for purposes of comparison, if you use the bigger numbers, it appears that Hub B has little more than twice as wide a range as Hub A, but in reality, Hub B has 15 times the range of Hub A! Just input any two tires, metric or standard, and click the button. Bicycle Gear Ratio Comparison Calculator – Berkshire Sports. 42/40 will give you a similar smallest ratio, even a little smaller at 1.05. Cadence is the number of revolutions of the crank per minute, this is the rate at which a cyclist is pedalling/turning the pedals. Calculators. Here is what you need to do: Then, if I am in the 6th gear of my hub, the table from the manufacturer says it gives me a 0.528 REDUCTION ratio. Table below: Shows table of all possible chainring/sprocket combinations with gear ratio. Sitemap. Ratio of the highest gear of your setup. Min ratio: Ratio of the lowest gear of your setup. Often, when doing a 2x to 1x conversion, a combination of a 1x chainring and a cassette is sought so that the ratios fall pretty much in line with what the rider is used to in the current 2x setup. Gear Ratio. Bicycle gear ratio calculator how to calculate bicycle gear ratio. The minimum gear ratio you can use with a Shimano hub is 1.9:1. Bicycle Gear Ratio Comparison Calculator – Berkshire Sports. The highest gear ratio is 28t with 12t; a ratio of 2.33:1. Add mm if required. 11 cogs on the rear cassette and two on the front chainring essentially gives you 22 different options (though some of these may cross over so not strictly true). If you have fewer just leave the unused ratios set to 1:1. Custom. How to calculate bicycle gear ratio? Knowing your bike’s gear-inch measurement allows you to make better decisions when customizing your gearing. Pedaling pace and the gear ratio directly influence the speed, the energy expended and distance. The reason for this is that they are the closest together, meaning you get a really low ratio. This gives you a way to compare gears on a single bike and also between bikes. your cranking along with your 2×10, front chain ring 38 (big ring) rear cog 21(6th gear) yielding a ratio 1.81. Skid Patches Enter Diff + Gear Ratios and Tire Diameter, then drag RPM slider to calculate speed from RPM. Say the chainrings on the bike are 48-38-28 and the cassette is a 9 speed one: 12-13-15-17-19-21-24-28-32. Each shows the bike, wheel size, and drivetrain on the left, then the granny gear ration (front x rear) and gear inches. Our only motto happy customers. Salsa Pony Rustler, 27.5+, 1×11 (30x42t) 20.7 gear inches. Calculators. The Bike Gear Calculator app will comparing the top gear (or any other gear) in each, expressed in various different ways including gear inches, gain ratios, development metres and your speed at a given cadence. If a bike with 20" wheels and a bike with 29" wheels both have the same gear ratio, the 29" bike will travel 45% farther with each revolution of the crank. You come around a turn, their in front of you is a steep windy climb, replete with bare slippery tree roots! Turn the pedals or control the pedaling rate with the button slider. Rohloff Hubs. Obviously, when Daryl put the chart together the new option packed XTR M9000 group was still under wraps, so the comparison to its 11-40 wide range cassette couldn’t be made. So, for every crank turn I have 2.875 times 0.528 = 1.518 wheel turns. Bicycle gear size and cadence/speed calculator Wheel size: 20" 24" 26" 700C 27" 650B 29" + tyre dia. Skid Patches Click on the board at the upper left or on the sprocket to change the number of teeth. The Easiest Gear. 0 20 mm 23 25 28 32 35 38 44 50 56 1.00 in. About Us Introduction Why MFactory? This ratio would be calculated as follows: divide the wheel radius by the crank length; this will yield a single radius ratio applicable to all of the gears of a given bike. The individual gear ratios are calculated as with gear inches, using this radius ratio instead of the wheel size. Gear Calculator Gear Ratio Compare Tool: Tools: Select Inputs : Wheel Information ... Gear Ratio: Numeric Ratio between the Gear Combination: Gain Ratio: The Ratio of distance the end of the crank arm travels to the distance the wheel travels by taking into account the length of the crank arm. Moving your mouse over the ratio will show speed you will achieve by pedaling at 100 rpm. Use our gear ratio calculator to find the effective gear ratio your vehicle will have with a new tire size. The gear inches are how big it seems. This online Sharpe Ratio Calculator makes it ultra easy to calculate the Sharpe Ratio. Colors group similar values. See the Diamondback Line 27.5 Mountain Bike Comparison Table Engines that have a smaller horsepower will have a higher ratio in the region of 2.33:1. The program allows for up to three ratios in series. Gear Inches is … Click the "Customize" button above to learn more! Simply adjust the data of the bike and then click on "Calculate tables and graph". I entered all the numbers from my bike and got this result. The metre ratio is its circumference in metres, or the distance moved by the bike in one complete pedal revolution. The result is that, for the sprocket sizes above we have a set of 21 gears ratios which cover a range between 1:1 and 4:1; The highest/hardest gear will result in us travelling four times the distance of the lowest/easiest gear for each pedal revolution. eCart GEAR RATIO CALCULATOR. For example, the default setup on the 700C sized Wabi bikes is 46T front ring and 18T rear cog. This handy application gives cyclists facts on-the-spot to improve their overall experience. To use the calculator below, select a wheel and tire size from the table or enter the wheel and tire size in mm in the “Dia. The bicycle gear calculator displays graphically the gearing of derailleur gears and gear hubs. Gear Ratio Speed Calculator. 2435. Motorcycle speed and sprocket calculator with bike database for gearing, sprockets, tires and chains of over 1600 bikes. For example, at 34-tooth chainring and 17-tooth rear cog have a 2:1 gear ratio. Transmission 1 - … A simple to utilize Aspect Ratio Calculator. Multiply that by 11 and you get a 42T chainring that you need. This calculator is useful for planning your rig, allowing you to see what kind of performance to expect from different combinations. Ratio of the highest gear of your setup. It can be used to compare different setups to find the optimal gearing for all kinds of bicycles. Useful tool for these considerations is the bicycle gear calculator. Input your stock and new tires sizes along with your original gear ratio. I got a KOM on one local Strava spring segment -- the segment's .3 miles, and I did it in 30 seconds even at 30.8 mph in my 42x16 ratio. Honda Grazia is a scooter available at a price range of Rs. For example, the default setup on the 700C sized Wabi bikes is 46T front ring and 18T rear cog. This allows you to see fairly complete information about chainring and cog choices, and the effects of the ratios. Example: 44/16 = 2. Gear Calculator Dealer Locator Dealer Login. Drag Max RPM slider to adjust the range of the RPM and Speedometer Gauges. For single speeds and geared hub bikes, ratio changes are pretty direct. If you have any questions post them in this thread. Simple, just divide your rear cog size from your front chainring size. [add 'mm' if required] If the highest gear, for example, is three times the lowest: that's a range of 300%. The program will also calculate speed based on engine RPM, drive ratio,and wheel diameter.
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