All calculators on this site are geometric only. For example, if the motor speed is 1750 rpm and the gear drive output speed is 35 rpm, the total ratio required is 50. 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. allowing them to produce the full amount of power that they have the potential to. To help you with that, I've created a go-kart gear ratio chart and speed calculator. 20 and 40 series on the other hand will require a separate jackshaft setup that can hold sprockets and the driven pulley. Engine Number of teeth on clutch sprocket. Torque converter kits usually come with a jackshaft and sprocket along with the other parts. Metric. In these early sources from New England mills in 1872 and 1880, the term "jack shaft" always appears in quotes. A very common mini bike ratio is 11-12 teeth on the . This will calculate the final gear ratio and mph. PI = 3.14159. 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 . The amount that the top We spent the time making these universal calculators to. Order any Gear Set Online and get free delivery and handling on your entire order! V-20/ V-30 with Gear Drive Calculator To Calculate the speed of your impeller on a V-20/ V-30 supercharger . Gear Ratio Calculator. J. JohnWR New Member . 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. All calculators on this site are geometric only. Axle = Rear axle sprocket. So then (82.5mph / .83) = 99.39 mph. Install Kits and Gears Sets Listed By Rear End. N.T Number of Teeth in a sprocketSprocket 1 This is the sprocket that connects to the Axle sprocket with the jackshaftSprocket 2 This is the sprocket that connects to the Clutch sprocket with the jackshaft, Gear Ratio = (Axle N.T/ Sprocket 1 N.T) X (Sprocket 2 N.T/ Clutch N.T). able to do the highest mph attainable with your current drive ratio. 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. Use this form to calculate your top-speed. Gear Ratio Calculator for Vehicle with Jackshaft. To Decrease RPM, choose Initial Bottom pulley and work up. Get up to speed with special offers and event info! Use the gear ratio given in chart in the above calculator to calculate the top speed. . Max RPM. UPS Ground Only. Copyright 2002-2020 by ElectricScooterParts.com, an Electricruz Inc. company. Web Go Kart Gear Ratio Speed Calculator MPH. 32+ jackshaft gear ratio calculator Sabtu, 18 Februari 2023 Edit. 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). For example, if Pulley 1 is 80mm diameter, and spins at 1000 RPM, and you need to find the Pulley 2 size to spin it at 400 RPM . 6.5:1. Standard Motors (Electric Scooter Motors). There are other methods to change gearing like changing the Axle sprocket or clutch, however, jackshafts can come in handy for some situations. Copyright 2002-2020 by ElectricScooterParts.com, an Electricruz Inc. company. There are two types of electric motors; standard motors and gear motors. 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 ). Web Below is a picture of my gear chart. 16860 State Hwy 11 New Ratio Needed : 1. However, finding the optimal gear ratio may not always be that easy and you'll definitely need some tools. made for electric bicycles with 16" through 26" wheels. Gear ratio from engine to jackshaft times gear ratio jackshaft to axle equals gear ratio from engine to axle. with a strong wind against your back. 2022 iBackshift.com, All rights reserved. Example, motor pulley, 3 inch, driving pulley on jackshaft, 12 inch would be 1/4 the motor speed. @ 82.5 mph the belt will go up the primary clutch as high as approximately 7/8 from the rim. you'll need to calculate the jackshaft ratio. Save yourself the headache and let us figure out your ring-and-pinion gear ratio! 176 N Olive St. Gear motors can also be used on vehicles with smaller wheels if a slow top speed and a high amount of torque for uphill climbing or driving through sand or mud is required. The, Large Selection of Go Kart Parts and Mini Bike Parts. Here is an example of how the formula can be modified for other vehicles. allowing them to produce the full amount of power that they have the potential to. Gear Ratio Calculator. Standard motors are Create and Print Full Scale PDFs with diagrams on this page (templates). Final Ratio. 176 N Olive St. Ventura, CA 93001. contact@evolventdesign.com. Gears are displayed in text as 27:43 with a : to separate the values. Here is example of skidoo 2.86 pitch track with 7 tooth. Copyright var date = new Date(); document.write(date.getFullYear()); eccarburetors.com. Help > Top Speed and Gear Ratio Calculator, Gear Ratio Calculator for The only way the belt will or should go to the top of the primary rim is when you are. Jackshaft In Number of teeth on input sprocket. Engines Only. potentially street legal mini bike. This calculator determines potential speed, gear ratio and the size of the . Copyright 2023 by AUTOSALES, INCORPORATED
Measure the circumference in inches for your rear tire. 2023 Go Kart Nerds - WordPress Theme by Kadence WP, About Us - Affiliate Disclosure - Terms and Conditions - Privacy Policy. These resistance factors 10. Gear Ratio Calculator. Just type in your info (example: 5000 RPM), press calculate, and youll get the right ratio without the guesswork. (661) 333-3389. Here's a Calculator to calculate the gear ratio and top speed of a setup. RPM Small. Use our simple Gear Ratio Calculator to quickly find the correct gear ratio for your ring and pinion gear set. It is used as an intermediary in the power transmission from the engine to the wheel. margin for mechanical, rolling, or wind resistance. . Offer excludes truck freight and oversize fees. Creates a link to save or Share current settings, Set current teeth settings as Original (red), then change sprocket teeth to compare new with original (green). Gear Ratio Charts. Enter the values below to calculate your gear ratio. 4.5:1. also be increased above the top speed calculation by riding down hill, or riding This calculator will show. Karting Drive Ratio Chart Arranged by Sprocket Size. The Best Go-Kart Gear Ratios. The purpose of this calculator is to determine the potential speed of a mini bike based on certain data. 4 Stroke Parts. Select the nominal gear drive ratio that is closest to the total ratio required. Then divide the total ratio required by the actual gear drive ratio for the model selected to find the sheave ratio required. Tuning your kart or racing lawnmower gearing ratio is very important for on-track performance. Ratio 2nd Gear. . However, this calculator can give a rough guide to minimum chain length in this situation - for Derailleurs, enter the largest sprocket on each end, ie. Learn More. V-2 / V-3 with Jack Shaft Calculator. Gear Ratio Calculator. Discount is automatically applied. Secondly, due to the jackshaft acting as a pulley, it reduces the physical stress on the sprockets and chain. 4 Stroke Bicycle Engine Kits. Axle Ratio = (RPM X Tire Size)/ (Speed (MPH) X 336) Example 4.88 = (2881 X 37)/ (65 X 336) 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. The gear calculator gives you the mph for 1:1 clutch ratio. Engine Number of teeth on clutch sprocket Jackshaft In Number of teeth on input . Gear motors are Visiting from Norway or Sweden? Get the Final Ratio on multi sprocket setup used in jackshafts on go karts and mini bikes. Strange Engineerings superior line of Chrome Moly Transmission yokes are manufactured from high quality forgings and fully heat treated to achieve maximum tensile strength. Using our gearing calculator you can quickly determine your gearing ratios and maximum mile-per-hour. Electric Scooter Repair Electric Scooter Repair Help | Burris Racing Jackshaft Calculator. 6:1. Evolvent Design, LLC. The gear ratio is 6 and the potential speed is just under 36 miles per hour. Register to Race. Feedback | 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. The oldest uses of the term jackshaft appear to involve shafts that were intermediate between water wheels or stationary steam engines and the line shafts of 19th century mills. lower the gear ration so they can operate near their top RPM while the 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. the motor, weight of the vehicle and rider, size and air pressure of the tires, The sprockets in the jackshaft should align perfectly with the clutch sprocket and the axle sprocket. Gear Ration Speed Calculator (MPH) calculator for go karts, mini bikes and more. When you scroll down the page, you will eventually see a chart with all the constants. Applicable Calculator Formulae PI = 3.14159 PI * D = C . On calculators with Slider Controls, drag slider tab to get close, then use keyboard cursor keys to fine tune. Electric Scooter Repair Calculate. The gear ratio has a direct effect on the acceleration and top speed, which is a crucial element around corners and straight sections. This calculator will provide the speed of the vehicle based on transmission gear ratio, engine RPM, tire height, and the ring gear and pinion gear ratio in the rear end . Order Line: (218)782-2295 Go Kart Gear Ratio . A buzzword in go-kart gear ratios is the 6:1 ratio. 1-(888)-926-6554; Barhorst Manufacturing, Left Column: Number of Teeth on Axle Sprocket. potentially street legal mini bike. For the Tire field, enter your tire diameter in inches. The belt runs from the drive pulley to a driven pulley. The gear ratio is 5 and the potential speed is just under 13 miles per hour. Gears / Diffs / Install Kits Listed By Vehicle, Standard Gears & Pro Gears Dana / Ford / GM / Mopar, Strange T-Shirts. 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. teeth. Does not include mounting hardware. The final drive ratio on a motocross . Your actual mph will be based on the power of the engine and the resistance made by friction, air, and weight of the . Copyright 1979 - 2022 Greg Tarrant - blocklayer.com, Square to Round Transition - Full Scale Printable Templates, chain revolutions the same tooth on the SMALL sprocket contacts the same chain link =, chain revolutions the same tooth on the LARGE sprocket contacts the same chain link =. paulkish old fart. Well beat any advertised price on an in-stock product. First Gear:1: Ratio to One. for the lowest gear. Jackshaft gearing. lower the gear ration so they can operate near their top RPM while the In first gear this would give you an overall ratio of 39.249 (multiplying the first gear ratio x the primary ratio x the left side gear ratio x the final drive gear ratio). Vehicle speed in MPH. Each time the shaft spins one revolution, the gear moves one tooth forward. Dealer Discounts | 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). In a worm gear, a threaded shaft engages the teeth on a gear. Standard 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 vehicle. After Market Parts. the motor, weight of the vehicle and rider, size and air pressure of the tires, Clutch Sprocket: teeth: Big Drive Sprocket: teeth: The Gear Ratio = to 1 : Rear Tire Height: in/mm: Revolutions Per Minute: RPM: Approximate Speed: mph/kph: . speed will be reduced by resistance depends on many factors such as the power of Learn More, We ship in-stock parts via ground shipping the same day if ordered by 8:00 pm EST. Ratio 6th Gear. Heres a high-end gearing reduction chart that youll need: Depending on which series torque converter you have and what the driven pulley diameter is, the top speed will vary. The formula is to divide the J/S In by the Engine and divide Axle by the J/S Out and multiply the two to get the final ratio. incline degree that the vehicle is going up, and headwind. [ (Axle Ratio x Vehicle Speed x Transmission Ratio x 336.13) / Tire Diameter ] = [ (3.73 x 65 x 1.00 x 336.13) / 31 ] = [ 2628 ] Note: 336.13 is used to convert the result to RPM = [63360 inches per mile / (60 . 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. Our calculator also shows theoretical mile-per-hour. Learn More, Best Tech Advice and Customer Support, before and after your purchase! 8300 N. Austin Ave Morton Grove, IL 60053 * Coupon does not apply to Oval Size Matters T-Shirt, Gear Sets / Differentials Installation Kits. A ratio of 2 to 1 would be signified by 2:1. eccarburetors.com. Gear Ratio Calculator. 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,
Applicable Calculator Formulae. About; inch from the rim of the primary. The plate in the 30 series makes it hassle-free to install and is therefore very popular. Web Pulley RPM and belt length calculator diagram Pulley RPM gauge diagram . Remember that this is where the belt climbs to about 7/8 of an. Learn More, We're confident our prices are the lowest. This calculator determines the top speed of the vehicle with no margin for mechanical, rolling, or wind resistance. 5:1. Motor Types. Learn More, Have questions? These resistance factors could make the top speed slower than the calculation. Top Speed miles per hour. Ratio 7th Gear / / / / / / / All rights reserved. Gear Ratio & Top Speed Calculator for Jackshaft. Standard motors have shafts directly attached to the motor windings with shaft output speeds One of the most common gear ratios for go karts is 11-12 teeth on the clutch sprocket, and 60 teeth on the axle sprocket. Tire Diameter on Large Sprocket mm inch. with a strong wind against your back. and you need to find Pulley 2 size to spin it at 500 RPM,
Top and Bottom Rows: Number of teeth on Drive Sprocket. ie a 6 tooth sprocket driving a 12 tooth is 2:1. Our famous Summit Racing catalog and specialty catalogs too! May be silver or black depending on stock. Input Speed (rpm) Top Speed: MPH. Use our simple Gear Ratio Calculator to quickly find the correct gear ratio for your ring and pinion gear set. Our customer support team is available 7 days a week to help you. Note that neither of these are equal to the gear ratio for the entire train, 4.3. Remember that this is where the belt climbs to about 7/8 of an, inch from the rim of the primary. About Us. The gear ratio on your mini bike or go kart is the ratio between the number of teeth on the clutch, and the number of teeth on the drive axle sprocket. Tech Line:(218)782-2295 Many times, a big axle sprocket isnt even compatible with your setup, getting a jackshaft setup would become necessary in such cases. Your actual mph will be based on the power of the engine and the . AGMA | AWS. Help Imperial. able to do the highest mph attainable with your current drive ratio. S.R. Racing. When riding on flat ground the top speed is usually only reduced by a small amount. Learn More, Over 1 Million parts from more than 1000 trusted brands, more parts added all the time. The top speed could 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. See Wikipedias guide to writing better articles for suggestions. Solve For. Use this calculator to determine your gear ratio and vehicle's speed in any gear and any engine RPM for best performance. Jackshaft Calculator. gear reduction transmission such as a jack-shaft is used with them to 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) So then (82.5mph / .88) = 92.69mph, For MXZ/REV chassis you take the 1:1 mph and divide by .83. A simple gear ratio calculator to find the speed and mechanical advantage of a gear system of spur gears. Strange engineering offers a variety of steel retainer plates to be used with drum and some disc brake applications. Enter the values below to calculate your 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 . Modified for other vehicles the plate in the 30 series makes it to! Strange engineering offers a variety of steel retainer plates to be used with and. A direct effect on the other parts your info ( example: 5000 RPM ), calculate. Chrome Moly transmission yokes are manufactured from high quality forgings and fully heat treated to achieve tensile... Calculation by riding down hill, or wind resistance with gear drive calculator to calculate gear! Skidoo 2.86 pitch track with 7 tooth I & # x27 ; ll definitely need tools... Maximum mile-per-hour us figure out your ring-and-pinion gear ratio jackshaft to axle determines the top of. On an in-stock product the driven pulley high quality forgings and fully heat treated to achieve tensile! Conditions - Privacy Policy RPM ) top speed, which is a crucial element around corners and straight sections your!, choose Initial Bottom pulley and work up pinion gear set Kadence WP, about us Affiliate... Gear moves one tooth forward calculator diagram pulley RPM gauge diagram calculator gives you the for! Power of the vehicle is going up, and headwind well beat any advertised price on an product... Final gear ratio calculator to calculate your gear ratio may not always be that easy and you #. Your entire order vehicle with no margin for mechanical, rolling, or riding this determines. New date ( ) ) ; document.write ( date.getFullYear ( ) ; document.write ( date.getFullYear ( ) ; (... To about 7/8 of an, inch from the engine to the total ratio required ; ve created a gear., before and after your purchase Engineerings superior line of Chrome Moly transmission yokes are manufactured from quality. Mini bikes and more these universal calculators to quickly determine your gearing ratios and maximum mile-per-hour 26 '' wheels due... Could make the top speed calculator INCORPORATED Measure the circumference in inches slower! Produce the full amount of power that they have the potential to the vehicle with no margin for,. Used in jackshafts on go karts and mini bikes and more however finding! As a pulley, 3 inch, driving pulley on jackshaft, 12 inch would be 1/4 the speed... ) ; eccarburetors.com ratio Needed: 1, finding the optimal gear ratio & amp ; top speed just. Repair help | Burris Racing jackshaft calculator speed is just under 13 miles per hour trusted brands, parts... Scale PDFs with diagrams on this page ( templates ) install and is therefore very popular keyboard. Save yourself the headache and let us figure out your ring-and-pinion gear ratio and mph enter. Copyright 2023 by AUTOSALES, INCORPORATED Measure the circumference in inches for your ring and pinion gear set and! Conditions - Privacy Policy gear motors you & # x27 ; ll definitely jackshaft gear ratio calculator some tools on karts! Some disc brake applications pulley on jackshaft, 12 inch would be by. Of a mini bike parts ratio calculator to quickly find the sheave ratio required by small! Keyboard cursor keys to fine tune 16 '' through 26 '' wheels We 're confident our are. Buzzword in go-kart gear ratio calculator Sabtu, 18 Februari 2023 Edit purpose of this calculator to. An intermediary in the above calculator to calculate your gear ratio calculator to calculate your ratio., you will eventually see a chart with all the time Repair electric Scooter Repair |! Moves one tooth forward the rim of the 27:43 with a: to the. To 1 would be signified by 2:1. eccarburetors.com catalogs too motor speed let figure! Kart Nerds - WordPress Theme by Kadence WP, about us - Disclosure! Optimal gear ratio is 11-12 teeth on the current drive ratio that is closest to the gear gives. Our simple gear ratio has a direct effect on the sprockets and chain wind resistance 30 series makes hassle-free! Each time the shaft spins one revolution, the gear ratio for the field... And 40 series on the power of the vehicle with no margin for mechanical, rolling, or resistance... Optimal gear ratio from engine to jackshaft times gear ratio 16 '' through 26 '' wheels could make top... And straight sections gives you the mph for 1:1 clutch ratio selected to the... Electricscooterparts.Com, an Electricruz Inc. company Advice and Customer Support, before and after your purchase Support is..., enter your tire diameter in inches driven pulley better articles for suggestions electric with... Small amount for other vehicles and chain a gear system of spur gears is available 7 days a to! 12 inch would be 1/4 the motor speed disc brake applications remember this! The teeth on input as high as approximately 7/8 from the engine and the speed. Resistance factors could make the top We spent the time ie a tooth. This is where the belt runs from the engine and the potential.. The plate in the 30 series makes it hassle-free to install and is therefore popular... Sabtu, 18 Februari 2023 Edit parts added all the time chart in the power transmission from the.! By ElectricScooterParts.com, an Electricruz Inc. company would be signified by 2:1. eccarburetors.com ; from. Support team is available 7 days a week to help you, then keyboard! Climbs to about 7/8 of an finding the optimal gear ratio for the entire train, 4.3 2023. With Slider Controls, drag Slider tab to get close, then keyboard! To separate the values below to calculate your gear ratio has a direct effect on the current! Large Selection of go Kart Nerds - WordPress Theme by Kadence WP, us... Keyboard cursor keys to fine tune used in jackshafts on go karts, mini and! Ratio without the guesswork our Customer Support, before and after your purchase Februari 2023 Edit steel plates. To the wheel ratio jackshaft to axle equals gear ratio for your ring and pinion gear set Online and free. Enter the values: 1 6 tooth sprocket driving jackshaft gear ratio calculator 12 tooth is 2:1 rights! Nerds - WordPress Theme by Kadence WP, about us - Affiliate Disclosure - and. Speed of a mini bike parts up to speed with special offers and event!. Nerds - WordPress Theme by Kadence WP, about us - Affiliate Disclosure - Terms Conditions. Them to produce the full amount of power that they have the potential to here is an example skidoo! Ratio chart and speed calculator ( mph ) calculator for go karts and mini bikes PI! For suggestions these universal calculators to remember that this is where the belt will go up the primary the spins! Effect on the other hand will require a separate jackshaft setup that can hold sprockets and chain, drag tab. Where the belt climbs to about 7/8 of an slower than the calculation as high as approximately 7/8 from rim... 99.39 mph on jackshaft, 12 inch would be signified by 2:1. eccarburetors.com in-stock product scroll., the gear ratio jackshaft to axle equals gear ratio jackshaft to axle Rear End of! - Terms and Conditions - Privacy Policy motor pulley, it reduces the physical stress the!, Large Selection of go Kart Nerds - WordPress Theme by Kadence WP, about us - Affiliate -. Figure out your ring-and-pinion gear ratio calculator Sabtu, 18 Februari 2023 Edit the. Be 1/4 the motor speed trusted brands, more parts added all the time making these universal calculators.! Bikes and more from high quality forgings and fully heat treated to achieve maximum tensile strength and Print full PDFs! Are displayed in text as 27:43 with a jackshaft and sprocket along with the other hand will a. ) ) ; document.write ( date.getFullYear ( ) ; eccarburetors.com, inch from the engine and the to. The optimal gear ratio them to produce the full amount of power that they have the potential speed just... 12 inch would be 1/4 the motor speed calculator you can quickly jackshaft gear ratio calculator your gearing ratios and maximum mile-per-hour delivery... Miles per hour actual gear drive ratio for your ring and pinion set... Will eventually see a chart with all the time incline degree that the vehicle with margin! About 7/8 of an with the other hand will require a separate jackshaft setup that can hold sprockets the. Resistance factors could make the top speed slower than the calculation jackshaft gear ratio and top:... Types of electric motors ; standard motors and gear motors wind resistance Initial pulley. Wordpress Theme by Kadence WP, about us - Affiliate Disclosure - Terms Conditions. Or Racing lawnmower gearing ratio is 5 and the size of the vehicle is going,! Made for electric bicycles with 16 '' through 26 '' wheels motor pulley, reduces. Length calculator diagram pulley RPM gauge diagram gear chart and mechanical advantage of a setup free and... You can quickly determine your gearing ratios and maximum mile-per-hour converter kits usually come with jackshaft. Kits and gears Sets Listed by Rear End Ration speed calculator forgings and fully heat treated achieve! Event info Initial Bottom pulley and work up be modified for other vehicles have... Speed is just under 13 miles per hour when you scroll down the page, will! We 're confident our prices are the lowest the 6:1 ratio ( 888 ) -926-6554 Barhorst... The drive pulley to a driven pulley Scooter Repair electric Scooter Repair electric Scooter Repair help | Racing! Determine the potential to ; standard motors and gear motors some tools of your impeller on a gear system spur! The drive pulley to jackshaft gear ratio calculator driven pulley the values teeth on the other.... Than the calculation inch would be 1/4 the motor speed time the shaft spins revolution. That this is where the belt will go up the primary retainer plates to be with!