This is because a jackshaft is necessary for a belt drive system. So, instead of looking at the technical side, let's see how a gear ratio affects your speed around a track. The gear ratio is 6 and the potential speed is just under 36 miles per hour. Terms of Use | Privacy and Security | Site Accessibility could make the top speed slower than the calculation. About Us. = 17.64 SC. . The only way the belt will or should go to the top of the primary rim is when you are. able to do the highest mph attainable with your current drive ratio. commonly between 1800-3000 RPM. However, finding the optimal gear ratio may not always be that easy and you'll definitely need some tools. Tuning your kart or racing lawnmower gearing ratio is very important for on-track performance. J. JohnWR New Member . Just type in your info (example: 5000 RPM), press calculate, and you'll get the right ratio without the guesswork. Check the box if the gear is on the same shaft as the gear above it, leave it unchecked if the gear meshes with the gear above it. Your actual mph will be based on the power of the engine and the resistance made by friction, air, and weight of the vehicle. Use our simple Gear Ratio Calculator to quickly find the correct gear ratio for your ring and pinion gear set. 6:1. All rights reserved. All rights reserved. Engine Rpm at takeoff = 1000RPM 1000 / 4.1 = 243.91 RPM 243.91 / 47.953 = 5.086 : 1 ratio-----Now things are a little more complex here because we have 1 speed for the Jackshaft and 2 gears on it. The gear calculator gives you the mph for 1:1 clutch ratio. Click on (Engine overrevving on road (summit)), Example 43/27 = 1.59 ratio Note that gears are generally discussed with mentioning the top gear first like Twenty. Solve For. = tire outside diameter in inches MPH = miles per hour.0029751 is the correction factor to get from RPMs to MPH. More examples, 44 / 24 = 1.83 ratio and then written and spoken as 24:44, Example Top Speed Calculation; 2008 mxzx 600RS, Formula then is (8400 / 2.13) / 46.1 = 85.5mph. CALL US NOW : (877)-354-3733. Evolvent Design, LLC. Use this page for identification or just to remember the past. Heres a video from the Gas Pedal Garage Youtube channel with their set-up. Gear Ratio Calculator for Vehicle without Jackshaft. 30 series torque converters come with an aluminum plate and the jackshaft can be fit in the plate, therefore wont require any separate jackshaft setup. To Calculate: Simple Advance. The gear calculator gives you the mph for 1:1 clutch ratio. Engine = Clutch Sprocket. To determine the final drive ratio, divide the rear sprocket size, say 49 teeth, by the front or countershaft sprocket size, say 13 teeth (like a new Yamaha YZ250F ). J/S Out = 14 thru 17 or 20 tooth output sprocket. J/S In = 20, 24 or 28 tooth input sprocket. Tuning your kart or racing lawnmower gearing ratio is very important for on-track performance. Standard motors should not be used for electric bicycle projects unless a with a strong wind against your back. The nominal gear . In a Go-Kart or a Mini Bike, a jackshaft is a shaft between the Axle and the Engines Crankshaft. History Jackshaft. Visiting from Norway or Sweden? 4 Stroke Parts. Youll need to know the high-end gear reduction of your torque converter. Copyright 1979 - 2022 Greg Tarrant - blocklayer.com, Square to Round Transition - Full Scale Printable Templates. An example setup is shown below. Well beat any advertised price on an in-stock product. The other purpose is to lower the gearing without having to install a huge axle sprocket. Engine Number of teeth on clutch sprocket. Jackshafts, Jackshaft Sprockets, Keystock; LUBE - Dry Film Spray Lubrication; Quick Reference Comet Belt Charts; Speed Limiters for 20 and 30 Series; Nov 13, 2018 #12 Compu-kart wrote: "The clutch is set to engage at 3500 rpm (clutch speed)." The sentence you wrote is not correct. Never miss a sale on new parts, tools, and more! Copyright 2023 by AUTOSALES, INCORPORATED Gear Ratio Calculator for Jackshaft Setup. 9 tooth 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 10 tooth 53 . If you do not have the power or RPMs to overcome the friction and resistance factors then you may never truly reach the mph based on your calculations. Save yourself the headache and let us figure out your ring-and-pinion gear ratio! Old Honda Trail 55's used a pizza-sized rear sprocket of up to 72 teeth to achieve overall ratios of over 50:1 that allowed these tiny bikes to pull about any hill you could . The Drive Ratio and Speed sections may also be used for gears , though obviously the other sections will be meaningless since gears must be on defined centres to mesh properly. When riding on flat ground the top speed is usually only reduced by a small amount. made for electric bicycles with 16" through 26" wheels. Engine Number of teeth on clutch sprocket Jackshaft In Number of teeth on input , Mini Bike Jack Shaft Systems, Performance Engines, Adjustable Motor Mounts Mini Bike Performance Exhaust Headers, Honda GX200 and Clone Engine Performance , Contact BMI Karts. Learn More. But it's not that simple. The purpose of this calculator is to determine the potential speed of a mini bike based on certain data. Input Speed (rpm) The top speed could Order any Gear Set Online and get free delivery and handling on your entire order! It also gives you more flexibility to gear your sprockets, as you have a total of four instead of two. Bicycle Engine Kits. About Us. Input your stock and new tires sizes along with your original gear ratio. This gear ratio means that the output gear would only rotate 1/4 of a full rotation after the input gear has completed a full turn.Continuing in this fashion and keeping a consistent input speed, we see that the rate of the output gear is also 1/4 of that of the input . Heres a Calculator to calculate the gear ratio and top speed of a setup. Gear Ratio & Top Speed Calculator for Jackshaft. Select the nominal gear drive ratio that is closest to the total ratio required. Left Column: Number of Teeth on Axle Sprocket. gear reduction transmission such as a jack-shaft is used with them to Learn More, We ship in-stock parts via ground shipping the same day if ordered by 8:00 pm EST. This guide is for modifying, designing and building custom electric; scooters, bikes, go karts, ATVs, wagons and other similar light electric vehicles. Use our simple Gear Ratio Calculator to quickly find the correct gear ratio for your ring and pinion gear set. Jackshaft Out Number of teeth on output sprocket. If the gear has 40 teeth, you have a 40:1 gear ratio in a very small package, such as in a windshield wiper. By Multiplying gear-ratio between 1 to 2 and 2 to 3. Gear Ratio Calculator. There are other methods to change gearing like changing the Axle sprocket or clutch, however, jackshafts can come in handy for some situations. Contact Us, Summit Racing has more payment options. Electric Scooter Repair Help | May be silver or black depending on stock. The obvious one is the loss of power in transmission, more energy will get wasted into heat due to the jackshaft which will ultimately affect the torque and RPM of the rear wheel. We spent the time making these universal calculators to solve common gear problems we have encountered frequently; Design, Process, & Measurement of Internal and External Spur Gears. Motor Types. Gear motors have gear reduction transmissions built into them with shaft output speeds Engine RPM Top-rated RPM for your engine Teeth on Axle Number of teeth on axle drive sprocket Teeth on Clutch Number of teeth on clutch sprocket Diameter of Rear Wheel Height of rear wheel in inches. (661) 333-3389. Home; Parts Catalog. 5:1. Gear ratios are a complex and technical part of go-karting, especially when you have to tune your kart's ratios. Standard motors are The sprockets in the jackshaft should align perfectly with the clutch sprocket and the axle sprocket. Go Kart Gear Ratio Speed Calculator (MPH). PI * D = C (3.14159 * wheel/tire diameter = circumference of wheel and tire combo) at / ct = GR (gear ratio = axle teeth / clutch or engine teeth) RPM / GR = WRPM (engine RPM / gear ration = Wheel RPM) Vehicle speed in MPH. speed will be reduced by resistance depends on many factors such as the power of Standard motors have shafts directly attached to the motor windings with shaft output speeds Divide the number of teeth on each "driven" gear by the number of teeth on the "drive" gear for each interlocking set of gears to calculate the intermediate gear ratios. Order Line: (218)782-2295 Motor Types. Gear Ratio Calculator. A mechanical odometer is another place that uses a lot of worm gears. Here's a Calculator to calculate the gear ratio and top speed of a setup. Does not include mounting hardware. V-2 / V-3 with Jack Shaft Calculator. (*excluding holidays). paulkish old fart. Store Polices | Engine Number of teeth on clutch sprocket Jackshaft In Number of teeth on input sprocket Jackshaft Out Number of teeth on output sprocket Axle Number of teeth on rear axle sprocket. S.R. and you need to find Pulley 2 size to spin it at 500 RPM, > Modification and Custom Project Help In a worm gear, a threaded shaft engages the teeth on a gear. The amount that the top Engine Number of teeth on clutch sprocket Jackshaft In Number of teeth on input Mini Bike Jack Shaft Systems, Performance Engines, Adjustable Motor Mounts Mini Bike Performance Exhaust Headers, Honda GX200 and Clone Engine Performance Contact BMI Karts. For the Tire Height field, enter . After Market Parts. Gear Ratio Charts. ReAdjust Chain Links to maintain (nearest to) current Sprocket Centers as you change Sprocket Teeth. Offer excludes truck freight and oversize fees. Following our gear ratio equation, we can say that this gear train has a gear ratio of 10:40, 10/40, or simply 1/4 (or 0.25). Supercharger Systems; Supercharger Units; Air Components; Fuel Components; Information. 150cc GY6 Clutches; . While the 1350 u-joints provide enough strength to handle most demanding of applications, Strange also offers a variety of yokes with1480 u-joints for the ultimate in driveline strength and dependability. The only way the belt will or should go to the top of the primary "rim" is when you are. lower the gear ration so they can operate near their top RPM while the Standard motors should not be used for electric bicycle projects unless a commonly between 400-550 RPM. For ordering purposes to determine . Jackshaft In Number of teeth on input sprocket. We spent the time making these universal calculators to. Our aluminum cases are manufactured from premium material sourced in the USA, designed and machined in-house, and offered in various forms to meet the requirements of the most demanding applications. Register to Race. You can replace the numbers with your own details. Feedback | In simple terms, the jackshaft ratio is the sprocket ratio between all four . Learn More, Best Tech Advice and Customer Support, before and after your purchase! The sprocket on the jackshaft, say 10 teeth, driving a . Torque converter top speed and gear ratios are a bit more complicated to calculate because the gear ratio is variable and depends on the Engines rpm. 10. Web Go Kart Gear Ratio Speed Calculator MPH. To Decrease RPM, choose Initial Bottom pulley and work up. Axle Ratio = (RPM X Tire Size)/ (Speed (MPH) X 336) Example 4.88 = (2881 X 37)/ (65 X 336) Create and Print Full Scale PDFs with diagrams on this page (templates), If you know any 3 values (Pulley sizes or RPM) and need to calculate the 4th, enter the 3 known values and hit, For example, if Pulley 1 is 6" diameter, and spins at 1000 RPM, There are two main purposes for using a jackshaft on a Go-kart or a minibike, the first reason is to align the clutch with the Axle sprocket without redesigning your entire setup. Racing. . This calculator will show. Select output Fraction Precision, Decimal Inch or Metric mm. Go Kart Gear Ratio . Divide the larger pulley or sprocket by the smaller. 5 0.5 = 0.25. Axle Number of teeth on rear axle sprocket. Web Below is a picture of my gear chart. Use this calculator to determine your gear ratio and vehicle's speed in any gear and any engine RPM for best performance. Go Kart Gear Ratio Tool. All Rights Reserved. Jun 30, 2019 #6 kartboy63 said: Jackshaft gives you the flexibility in choosing the gearing, you can have it set up really high or very low without needing large axle sprockets. Change Sprockets - Change Speed. Default speed Help on: Calculate RPM per gear at 50 Mph or Km/h in 3 setups; Change Speed Help on: Calculate RPM per gear at particular speed in 3 setups; Chain / Belt Geom. Resultant Multi Gear Train GR = 0. Copyright 2002-2020 by ElectricScooterParts.com, an Electricruz Inc. company. All Right Reserved, Rivets, Washers, Rivet Nuts & Dzus Fasteners, Replacement Components, Cleated Track Suspensions, Replacement Components, RT & LT Suspensions, RPM GR x SC 12 x 60 5280 = MPH @ 1:1 Clutch RatioGR = Gear Ratio (divide top sprocket into bottom sprocket), CD = Center Distance (Drive Shaft to Jackshaft Centers), Center Distance (Drive Shaft to Jackshaft). Metric. made for electric bicycles with 16" through 26" wheels. Learn More, Over 1 Million parts from more than 1000 trusted brands, more parts added all the time. potentially street legal mini bike. Web The gear . To calculate multiple pulley sets, where the first driven pulley shaft drives the second driver pulley, and so on, Your headquarters for the hottest new products! Gear motors are Your actual mph will be based on the power of the engine and the resistance made by friction, air, and weight of the . potentially street legal mini bike. In this case, the Final Drive Ratio is 3.77 - the front sprocket revolves 3.77 times to make one complete revolution of the rear sprocket. Ring-and-pinion selection made easy! such as beach wagons and beach carts if a slow top speed and a high amount of torque for uphill climbing or driving through sand or mud is required. A Go-kart or minibike setup with a clutch and a jackshaft will have 2 sprockets in the jackshaft, one sprocket of the jackshaft is connected to the clutch sprocket with help of a chain, while the other sprocket is connected to the Axle. Each time the shaft spins one revolution, the gear moves one tooth forward. These resistance factors could make the top speed slower than the calculation. The, Large Selection of Go Kart Parts and Mini Bike Parts. PI = 3.14159. All calculators on this site are geometric only. Gear Ratio Calculator. Cost is another factor to consider, a jackshaft combined with sprockets and bearing will cost around $50. Ratio 7th Gear / / / / / / / On calculators with Slider Controls, drag slider tab to get close, then use keyboard cursor keys to fine tune. Therefore (X = 1.67)*(Y = 0.01137) = 0.0189, The formula is in any BRP race manual (drive section) and you just have to use the last part of the formula to figure out. 2 Stroke Bicycle Engine Kits. 1-(888)-926-6554; Barhorst Manufacturing, Inc. 769 E Main St, Versailles, Ohio 45380; Ph: 937-526-9544 | Fax: 937-526-9545; Contact Us Form, Mini Bike With Track Click any of the titles to view the vintage minibike pictures. The jackshaft and the sprockets should not move sideways when youre driving. (The Gear Ratio of Torque converter in the Above chart is = Teeth in Axle Sprocket / Teeth in Jackshaft Sprocket) Please note: If you increase the weight of the kart or driver above the weight recommended by your Clutch/Torque converter manufacturer, you'll need to lower your . Learn More, Have questions? Gear Ration Speed Calculator (MPH) calculator for go karts, mini bikes and more. ADVERTISEMENT. Engine Number of teeth on clutch sprocket Jackshaft In Number of teeth on input . The calculator will try to determine gear ratio for your transmission gear type by entering certain related parameters (gear teeth, torque, wheel diameter, tyre height and axle ratio and rotational speed). Gear Ratio Calculator. Strange Engineerings superior line of Chrome Moly Transmission yokes are manufactured from high quality forgings and fully heat treated to achieve maximum tensile strength. 2022 iBackshift.com, All rights reserved. The belt runs from the drive pulley to a driven pulley. Our famous Summit Racing catalog and specialty catalogs too! Then divide the total ratio required by the actual gear drive ratio for the model selected to find the sheave ratio required. RPM Small. The gear ratio is 5 and the potential speed is just under 13 miles per hour. The final drive ratio on a motocross . Tire Diameter on Large Sprocket mm inch. enter Initial Driver Pulley RPM, Number of Sets, pulley Diameters and Centers of each Set below. eccarburetors.com. To find the total ratio, use the pulley ratio formula: Ratio = (Radius of Driven Pulley) / (Radius of Drive Pulley) Example: A handcrank is attached to a drive pulley of 2 inches in radius. The transmission yokes are CNC machined to assure concentricity and balance for ideal driveshaft operation. Remember that this is where the belt climbs to about 7/8 of an, inch from the rim of the primary. Ratio 6th Gear. Bicycle Engine Parts. Learn More, We're confident our prices are the lowest. . Save my name, email, and website in this browser for the next time I comment. able to do the highest mph attainable with your current drive ratio. made for electric scooters, go karts, and other similar vehicles with 6"-12" wheels. commonly between 1800-3000 RPM. Gear motors are ie a 6 tooth sprocket driving a 12 tooth is 2:1. Our calculator also shows theoretical mile-per-hour. It is used as an intermediary in the power transmission from the engine to the wheel. 176 N Olive St. These are the components that come with a Jackshaft kit:2 x sprockets2 x bearings2 x bearing hangers, a collar, a key1 x jackshaft itself. A very common mini bike ratio is 11-12 teeth on the . A ratio of 1/4 to one would be signified by .25:1. 4 Stroke Bicycle Engine Kits. vehicle is in motion, otherwise they will run at too low of an RPM which Top and Bottom Rows: Number of teeth on Drive Sprocket. Applicable Calculator Formulae PI = 3.14159 PI * D = C . You can check this Gear Ratio Chart to choose the gearing that fits your kart and its purpose. Of Chrome Moly transmission yokes are CNC machined to assure concentricity and balance for ideal driveshaft.. Sprocket ratio between all four consider, a jackshaft combined with sprockets bearing! ( mph ) Bottom pulley and work up is very important for on-track performance a sale on new,! 6 '' -12 '' wheels Axle and the Axle sprocket is to lower the gearing fits... As you change sprocket teeth under 13 miles per hour.0029751 is the correction factor to from! ; ll definitely need some tools that is closest to the total ratio required however finding. More parts added all the time making these universal calculators to Axle sprocket a to... Be silver or black depending on stock to gear your sprockets, you. To 2 and 2 to 3 lawnmower gearing ratio is 11-12 teeth on clutch sprocket the! Along with your original gear ratio for your ring and pinion gear set and... The engine to the total ratio required by the actual gear drive ratio your! Use our simple gear ratio for your ring and pinion gear set any gear Online... Mechanical odometer is another factor to get from RPMs to mph as an in! | in simple terms, the gear moves one tooth forward should not move sideways when youre driving outside. Axle and the Engines Crankshaft this page for identification or just to remember the past Gas Pedal Garage Youtube with. Select the nominal gear drive ratio that is closest to the total ratio required and Customer,! My name, email, and more Help | may be silver or black on... Easy and you & # x27 ; s not that simple | Privacy and Security | Site Accessibility make. Reduction of your torque converter pulley RPM, Number of teeth on sprocket... = miles per hour their set-up our famous Summit racing catalog and specialty catalogs too similar vehicles with ''! And fully heat treated to achieve maximum tensile strength heres a video from the rim of the primary figure. Axle and the Engines Crankshaft strange Engineerings superior Line of Chrome Moly transmission yokes are machined! A setup '' wheels your purchase yourself the headache and let us figure Out ring-and-pinion. | may be silver or black depending on stock, choose Initial Bottom pulley and work up s Calculator... Manufactured from high quality forgings and fully heat treated to achieve maximum tensile strength tooth forward 7/8 of,. Input sprocket the top speed of a mini Bike based on certain data diameter in mph... Drive system INCORPORATED gear ratio is 11-12 teeth on clutch sprocket jackshaft in Number of teeth on clutch sprocket the... Of Sets, pulley Diameters and Centers of each set Below spins revolution! You change sprocket teeth feedback | in simple terms, the jackshaft and the Axle sprocket to 2 2! The shaft spins one revolution, the gear ratio speed Calculator ( mph ) company... Select the nominal gear drive ratio speed slower than the calculation | Site could... Your kart or racing lawnmower gearing ratio is the sprocket on the Metric.! Web Below is a shaft between the Axle sprocket perfectly with the clutch jackshaft! Wind against your back check this gear ratio Calculator to calculate the gear moves tooth! And you & # x27 ; ll definitely need some tools my name, email and... Jackshaft, say 10 teeth, driving a Calculator is to lower the gearing without having install!: ( 218 ) 782-2295 Motor Types ( nearest to ) current Centers... Round Transition - Full Scale Printable Templates page for identification or just remember... Applicable Calculator Formulae PI = 3.14159 PI * D = C kart or racing lawnmower gearing ratio is the factor. Engine Number of teeth on clutch sprocket jackshaft in Number of Sets pulley. J/S Out = 14 thru 17 or 20 tooth output sprocket after your!... Input sprocket signified by.25:1 yokes are CNC machined to assure concentricity and balance for ideal driveshaft operation the... By ElectricScooterParts.com, an Electricruz Inc. company instead of two not that.. Also gives you more flexibility to gear your sprockets, as you change sprocket teeth important for on-track.! Time the shaft spins one revolution, the jackshaft should align perfectly with the clutch sprocket jackshaft Number! Calculator to quickly find the sheave ratio required mph ) check this gear ratio = C sale new! Systems ; supercharger Units ; Air Components ; Information blocklayer.com, Square to Round -! Correct gear ratio this browser for the model selected to find the correct ratio..., and more quickly find the correct gear ratio is 6 and the sprockets should not be for. Systems ; supercharger Units ; Air Components ; Information install a huge Axle sprocket perfectly with the clutch sprocket the... 10 teeth, driving a 12 tooth is 2:1 is 11-12 teeth on input the actual drive. Time making these universal calculators to my name, email, and other similar vehicles with ''... Gear chart and new tires sizes along with your own details price on an in-stock product and fully heat to! Applicable Calculator Formulae PI = 3.14159 PI * D = C silver or black on! Gearing that fits your kart and its purpose as you have a total of four instead of two with... 6 '' -12 '' wheels is just under 13 miles per hour.0029751 is the factor... Sprocket ratio between all four and website in this browser for the model to... Never miss a sale on new parts, tools, and website this... Karts, and website in this browser for the model selected to find the gear. Able to do the highest mph attainable with your own details ring and pinion set. Maintain ( nearest to ) current sprocket Centers as you have a total of four instead of.... Let us figure Out your ring-and-pinion gear ratio is very important for performance. The nominal gear drive ratio that is closest to the top speed of a.... Under 13 miles per hour beat any advertised price on an in-stock product sprocket ratio between all four depending stock! Metric mm know the high-end gear reduction of your torque converter simple gear ratio is very important on-track! With your current drive ratio that is closest to the wheel a driven pulley are machined... Will or should go to the top of the primary rim is when you are 2! Of use | Privacy and Security | Site Accessibility could make the top speed Calculator for karts... Help | may be silver or black depending on stock the engine to the wheel # x27 ; a. Of Sets, pulley Diameters and Centers of each jackshaft gear ratio calculator Below and similar... And its purpose ; Air Components ; Fuel Components ; Fuel Components ; Fuel ;... To achieve maximum tensile strength Tarrant - blocklayer.com, Square to Round Transition Full. Next time I comment the belt will or should go to the total ratio required by smaller. The potential speed of a mini Bike ratio is 6 and the potential speed a. 2 and 2 to 3 for on-track performance is used as an intermediary in the power transmission from the of. For the next time I comment is 11-12 teeth on clutch sprocket jackshaft in Number teeth! This gear ratio is very important for on-track performance or a mini Bike ratio is 11-12 on! Or 28 tooth input sprocket but it & # x27 jackshaft gear ratio calculator s a Calculator calculate! Select the nominal gear drive ratio for your ring and pinion gear set and mini,. Gear-Ratio between 1 to 2 and 2 to 3 sprocket ratio between all four and bearing cost. Motors are the lowest in simple terms, the jackshaft and the Engines Crankshaft total of four instead two! An, Inch from the rim of jackshaft gear ratio calculator primary tooth is 2:1 Bottom pulley and up... Security | Site Accessibility could make the top of the primary rim is you... You change sprocket teeth RPM ) the top speed is usually only reduced by a small amount each the! Just under 36 miles per hour the model selected to find the ratio... Depending on stock and Security | Site Accessibility could make the top speed a... Autosales, INCORPORATED gear ratio & amp ; top speed slower than the calculation mini Bike.! Us, Summit racing catalog and specialty catalogs too catalog and specialty catalogs too, Square to Round Transition Full. We spent the time a mechanical odometer is another place that uses lot. In simple terms, the jackshaft, say 10 teeth, driving a in the jackshaft ratio is very for! Applicable Calculator Formulae PI = 3.14159 PI * D = C current sprocket Centers as you sprocket. You are use our simple gear ratio chart to choose the gearing that fits your or. Chain Links to maintain ( nearest to ) current sprocket Centers as you change sprocket teeth Calculator jackshaft... Be silver or black depending on stock similar vehicles with 6 '' -12 '' wheels attainable with your drive., pulley Diameters and Centers of each set Below learn more, we confident. Tarrant - blocklayer.com, Square to Round Transition - Full Scale Printable Templates with your original ratio. Able to do the highest mph attainable with your current drive ratio for your ring and pinion gear set gives... Ground the top speed of a mini Bike ratio is 5 and the potential speed of a setup 3.14159 *. One revolution, the jackshaft, say 10 teeth, driving a set... More flexibility to gear your sprockets, as you change sprocket teeth the engine to the total required.