Pinion User Manual
Contents
1. do not use any impact tools hammer etc Screw in center screw 1 and tighten to a tightening torque of 10 N m 89 Ibf in Tighten the two clamp screws 2 in stages and alternately until both screws have reached a tightening torque of 6 N m 53 Ibf in gt The chain ring has been replaced 25 INSTALLATION WORK 26 CHAIN LENGTH amp CHAIN TENSION The correct length of your bicycle chain depends on various factors The number of teeth on the sprocket and chain ring after replacement it may be necessary to reset the chain tension Suspension travel and type of spring rear hub of your bicycle frame follow the manufacturer s instructions Type of chain tensioner or tensioning system horizontal dropout ends with clamp screws follow the manufacturer s instructions The basic rule for the length of your bicycle chain is as short as possible and as long as necessary The function and adjustment range of your chain ten sioner and the complete suspension of the rear triangle must not be impaired NOTICE Accelerated wear of the complete drive because of excessively high chain tension For direct tension horizontal dropouts with clamp screws make sure that the chain has approx 10 15 mm play fig 32 P1 18 p n on 4 T30 Yor 6a INSTALLATION WORK INSTALLING TRANSMISSION NOTICE Incorrect installation may distort and damage the transmission Make sure that all fou2. If the instructions in this manual are not observed this may result in accidents with fatal consequences or serious injury SYMBOLS The pointing finger prompts you to carry out an action gt The arrow shows results or requirements O This instruction gives you additional information or tips A WARNING This instruction warns of a hazardous situation which if not avoided may result in death or serious injury A CAUTION This instruction warns of a hazardous situation which if not avoided may result in minor or moderate injury NOTICE This instruction warns of potential material damage NOTICE ENVIRONMENT This instructions warns of potential environmental damage P1 18 p n on EN INTRODUCTION Keep this manual for other users of your Pinion product Make sure that every user reads understands and observes this manual If you ever sell or give away your Pinion product give this manual to the new owner The illustrations in this manual may be different from your Pinion product but the required work steps are the same for all models and variants unless other wise specified The type name of your Pinion bicycle transmission is stamped on the left side of the transmission above the transmission cover fig 1 Please note that the transmission will have a different feel compared to a chain transmission Familiarize yourself with your new Pinion bicycle transmission and the differences in
3. 16 01 When shifting up from 06 to 07 and from 12 to 13 always release the pressure on the pedal 11 INSTALLATION WORK fe 2mm 12 INSTALLING ROTARY SHIFTER A WARNING Incorrect installation may restrict braking and steering and cause accidents Make sure that the position of the rotary shifter does not interfere with the full range of operation of the brake lever Make sure that the derailleur cables do not interfere with the handlebar movement Incorrectly mounted handlebars may fail and cause an accident Make sure that the clamp ring 1 is present the clamp screws 2 do not act directly on the handlebar surface fig 6 Always follow the manufacturer s directions for carbon handlebars The Pinion rotary shifter is generally correctly positioned in the adjusting screws 3 with the derailleur cable pointing down and slightly forward i e in the 4 5 o clock direction fig 5 In this position you can best see the current gear and the derailleur cables do not interfere with the brake lever G In the event of a fall it is advantageous if the brake lever and rotary shifter can twist This reduces the danger of irreparable damage including the handlebar Tighten the clamp screws of the brake lever and rotary shifter just tight enough so they cannot be twisted by hand Use carbon mounting paste on the clamp area for carbon handlebars Attaching rotary shifter to the handlebar Attach rotary
4. shifter 4 and if applicable bar end to the handlebar fig 5 Push rotary shifter onto the handle of the handlebar to the stop and rotate to the correct position Tighten the two clamp screws 2 alternately in stages do not exceed the maximum tightening torque of 1N m 9lbf in under any circumstances fig 6 gt This completes the installation of the rotary shifter P1 18 p n on 2mm 0 25 N m 2 Ibf in max INSTALLATION WORK INSTALLING OR REPLACING THE DERAILLEUR CABLE G Your Pinion bicycle transmission is operated with one pulling cable even though it appears at first glance to have two derailleur cables The clamps for both pulling cable ends are in the rotary shifter You can order the prepared long pulling cable directly from Pinion If you wish to use your own pulling cable always use one with the following dimensions 1 2mm length 3000 mm An end nipple is not necessary Unscrew the housing screws 1 of the cover 2 on the rotary shifter Remove the cover The clamp screws are easily accessible at rotary shifter positions Ol and 18 Slacken clamp screws 3 2x per cable end Pull the ends of the pulling cable out of the rotary shifter Hold the adjusting screws 4 in position and slacken the lock nuts 5 fig 7 Screw the lock nuts to the stop on the heads of the adjusting screws First screw in adjusting screws completely then unscrew three revolutio
5. a back pedal brake for use with a rear cassette freewheel hub with spacers for setting the correct chainline for use with a suitable chain tensioner system for the maximum approved rider weight see Tecunicat Data page 6 Pinion bicycle transmissions must never be used in combination with a rigid single gear rear wheel hub A back pedal brake cannot be used with the freewheel integrated in the transmission BASIC SAFETY INSTRUCTIONS Always remember that cycling can be dangerous for the rider and other people and also for the bicycle and its components Accidents resulting in death or serious injury may happen even with the best protective equipment and all required safety devices Use your common sense and avoid dangerous actions Installation amp maintenance A WARNING A transmission damaged as a result of faulty or non approved installation may cause an accident Don t overestimate your technical ability Have all installation and maintenance work done by a specialist workshop for bicycles That is the only way to be sure that the work is done correctly Installation work that is not described in this owner s manual e g opening the transmission etc must be done exclusively by a specialist workshop authorized by Pinion or by the Pinion company itself Do not attempt work of this type yourself you will not only endanger your own health but you may be exposed to liability claims Never modify
6. alculating your individual ratio at www pinion eu 34 11 2 2 8 9 2 7 4 24 3 6 6 21 7 6 0 19 7 5 4 17 7 4 8 15 7 4 3 14 1 3 8 12 5 3 1 10 2 J j 222 il PEPE EEE EEE 12 13 14 15 16 17 18 TIGHTENING TORQUES Transmission retaining screws Central crank screws Crank clamp screws Chain ring lock ring Shift box housing screws Rotary shifter clamp screws Rotary shifter cover housing screws Cable clamp screws Oil screw plug TECHNICAL DATA 8 3 27 2 Tightening torque in N m Ibf in max 10 89 with threadlocker 10 89 dry 6 53 with threadlocker 30 266 greased 1 5 13 dry 1 9 dry 0 25 2 dry 0 25 2 dry 3 27 dry SAFETY INTENDED USE A WARNING Use other than as intended may cause accidents resulting in death or se rious injury Pinion bicycle transmissions are designed and intended exclusively for installation on bicycle frames designed for the purpose with rigid rear triangle and a transmission bracket in the area of the bottom bracket for installation on bicycle frames designed for the purpose with suspension rear triangle and a transmission bracket in the area of the bottom bracket and if necessary in combination with a suit able chain tensioner system that compensates for the distance between the chain ring and sprocket that varies with the move ment of the suspension for use with a single gear rear freewheel hub without
7. chain disengages more noise if only one of these parts is replaced We recommend replacing all three parts if one needs replacing Remove chain Unscrew center screw 1 Slacken both clamp screws 2 on the crank Pull the crank from the input shaft Hold chain ring with chain whip Unscrew lock ring 3 clockwise left hand thread with the Pinion lock ring tool 4 Remove chain ring P1 18 p n on 30 N m 266 Ibf in max INSTALLATION WORK Make sure that the gears 5 and contact surfaces on the transmission side and the chain ring 6 and lock ring 3 are clean and free from old grease Lightly grease gears 5 Hold chain ring with chain whip Install chain ring Lightly grease contact area and thread of lock ring 3 Screw in lock ring counterclockwise left hand thread with the Pinion lock ring tool 4 Hold chain ring with chain whip Tighten lock ring 3 to a tightening torque of 30N m 266 Ibf in If necessary install new chain see CHAIN LENGTH amp CHAIN TENSION Page 26 To protect the gears 7 on the input shaft and cranks from one sided loads it is a good idea to remove both cranks regularly 1x a year and to replace them offset by 1 2 teeth and with fresh grease Make sure that the gears 7 on the input shaft and crank are clean and free from old grease Lightly grease gears Position crank and push it manually on the input shaft to the stop
8. continues to rotate because the sprocket or rear wheel hub does not move easily during freewheel may cause an accident Before every ride make sure that sprocket and rear wheel hub freewheel smoothly Rotate the crank backwards the chain must not move with the sprocket and rear wheel hub during freewheel P1 18 p n on R b na SHIFTING CORRECTLY G The mark 1 on the fixed part of the rotary shifter shows the selected gear fig 4 You can shift through several gears with one movement e g from 06 to 02 You cannot shift directly from O1 to 18 or from 18 to 01 You can shift at a standstill or with the crank rotating backwards and this protects the transmission Downshifting 18 17 16 01 under load is possible to a limited extent To protect the transmission the shift is not executed if the pressure on the crank or pedal is too high e g during out of the saddle pedaling A mechanism in the transmission allows upshifts 01 02 03 18 under load This is possible during all shifts except when shifting from 06 to 07 and from 12 to 13 At these points the pressure on the pedal must be momentarily released You may hear a more or less unobtrusive clicking sound in gears 07 and 13 This is normal and there is no reason for concern Always reduce the pressure on the pedal during downshifts 18 17
9. ft is less immediate Synchronizing position of rotary shifter Shift rotary shifter clockwise 01 02 03 18 to the stop towards posi tion 18 fig 38 Check that the symbol for position 18 is centrally placed beside the mark 4 Screw in adjusting screw 1 4 revolution clockwise Unscrew adjusting screw 2 1 4 revolution counterclockwise gt The rotary shifter scale moves counterclockwise towards position 17 or Unscrew adjusting screw 1 revolution counterclockwise Screw in adjusting screw 2 1 4 revolution clockwise gt The rotary shifter scale moves counterclockwise towards position 01 Check setting and repeat procedure if necessary Hold adjusting screws 1 2 and tighten lock nuts 3 to a tightening torque of 2 3 N m 18 27 Ibf in fig 37 29 MAINTENANCE WORK 30 OIL CHANGE Every 10000 km 6 200 miles or 1x per year the oil in your Pinion bicycle transmission must be changed Use original Pinion gear oil exclusively Fill volume see Tecunicat Data page 6 NOTICE ENVIRONMENT Dispose of used lubricants and oils correctly and in accordance with the applicable regulations never dispose of waste in the sewage system or in the ground Unscrew housing screws 1 of the transmission cover 2 Remove the transmission cover Unscrew the screw plug 3 in the filler opening Have a drainage tray ready Place bicycle on its side Dra
10. g 20 q 18 9 Insert the right end of the pulling cable through the outer sleeve of the derail leur cable Insert the right end of the pulling cable through the outer adjusting screw towards the end of the handlebar 13 rotary shifter housing and clamp 14 Keep the right end of the pulling cable under tension fig 21 Make sure that the end of the derailleur cable outer sleeve are firmly in the stops on the adjusting screw and transmission housing Tighten the two clamp screws alternately to a tightening torque of 0 25N m 2 Ibf in Cut off the right end of the pulling cable as close as possible to the clamp with a sharp wire cutter oeg 1 5mm 0 25 N m 2 Ibf in max 20 P1 18 pinion MADE IN GERMANY INSTALLATION WORK Position cover 2 Tighten housing screws 1 to a tightening torque of 0 25 N m 2 Ibf in Test shifting function if necessary adjust cable tension with the adjusting screws see Apuustine sHirtins page 29 Position transmission cover 7 Tighten housing screws 6 to a tightening torque of 1 5N m 13 Ibf in gt The replacement of the derailleur cable is complete 25mm 1 5 N m 13 Ibf in max 21 INSTALLATION WORK INSTALLING PINION CHAIN TENSIONER A WARNING If a chain tensioner fails because of improper use it may cause an accident The Pinion chain tensioner is designed and intended exclusively for use with a Pinion bicycle transmissi
11. he ends of the pulling cable Make sure that the PTFE sealing ring 9 is correctly seated in the transmission housing fig 10 Insert pulling cable helix into the transmission housing fig 16 Make sure that the insertion hole of the pulling cable helix is centrally positioned between the transmission housing holes Maintain tension on the ends of the pulling cable 17 INSTALLATION WORK Keep the left end of the pulling cable under tension fig 17 Rotate the sun gear 10 8 clicks clockwise or to the stop with a 3mm Allen wrench gt 1 gear is engaged Insert the left end of the pulling cable through the outer sleeve of the derailleur cable 18 P1 18 pinion MADE IN GERMANY INSTALLATION WORK Switch rotary shifter to positionO1 fig 18 ei5mm Insert the left end of the pulling cable into the internal towards the center of the handlebar adjusting screw 11 rotary shifter housing and clamp 12 Keep the left end of the pulling cable under tension fig 19 Make sure that the ends of the derailleur cable outer sleeve are firmly in the stops on the adjusting screw and transmission housing Tighten the two clamp screws alternately to a tightening torque of 0 25N m 2 Ibf in Cut the left end of the pulling cable as close as possible to the clamp with a sharp wire cutter 080 S 19 INSTALLATION WORK Rotate rotary shifter clockwise 01 02 03 18 to position 18 fi
12. in used oil completely from the filler opening into the drainage tray Place the bicycle upright or replace on repair stand Add fresh oil fill volume see Tecunicat Data page 6 Replace screw plug 3 in filler opening and tighten to a tightening torque of 3N m 27 Ibf in Position cover 2 Tighten housing screws 1 to a tightening torque of 1 5 N m 13 Ibf in gt The oil change is complete P1 18 p n on LIABILITY The legal liability requirements apply for damage to material and workmanship The liability period starts on the date of initial pur chase This does not include components that are subject to normal wear e g shift cable with external sleeve Damage caused by improper use unintended use or improper instal lation or maintenance is not included We also do not accept liability for immediate or consequential damages arising from negligence In case of damage first contact the dealer from which you purchased your Pinion product The dealer will contact the bicycle manufacturer distributor or us directly to discuss the procedure on your behalf Do not return a defective Pinion product directly to us without prior consultation LEGAL INFORMATION 31 Pinion GmbH 2012 All rights reserved Printed in Germany 07 2012 Umschlag amp Inhalt www technische redaktion de Pinion GmbH Heerweg 15A 73770 Denkendorf phone 49 711 217491 51 fax 49711217491 79 info pini
13. ns gt This ensures an adequate adjustment range for subsequent adjustments of the transmission 13 INSTALLATION WORK 14 Unscrew the housing screws 6 of the transmission cover 7 Remove the transmission cover Remove the pulling cable helix 8 with the cable from the transmission housing Make sure that the PTFE sealing ring 9 is correctly seated in the transmission housing Remove the pulling cable from the pulling cable helix P1 18 pinion MADE IN GERMANY INSTALLATION WORK Hold crank and chain ring in position Xx CLIC Rotate sun gear 10 clockwise to the stop with a 3mm Allen wrench gt 1 gear is engaged Hold crank and chain ring in position 8x CLIC Rotate sun gear 10 8 clicks counterclockwise with 3mm Allen wrench gt 9 gear is engaged 15 INSTALLATION WORK Insert new pulling cable through the hole in the pulling cable helix Leave the pulling cables hanging with equal lengths fig 13 Wind the pulling cable ends revolution around the pulling cable helix fig 14 Press the pulling cable at the bends into the guide of the pulling cable helix with a small screwdriver Hold the pulling cable with the pulling cable helix with one hand so the pulling cable cannot unwind 16 P1 18 pinion MADE IN GERMANY INSTALLATION WORK Insert the ends of the pulling cable through the holes in the transmission housing fig 15 Maintain tension on t
14. on Always install the Pinion chain tensioner on the retaining positions on your Pinion bicycle transmission only The Pinion chain tensioner can be mounted on your Pinion bicycle transmis sion in one of two different positions A or B fig 24 The selection of the correct position depends on the installation position se lected by the manufacturer of your bicycle for the Pinion bicycle transmission Make sure that your Pinion chain tensioner transfers the tension effect in full to your bicycle chain in the position that you select but also cannot contact the chain stay or tire of your bicycle at any position Remove chain Remove crank and chain ring see Reptacine chain RING Page 24 Tighten retaining screws 1 to a tightening torque of 4N m 351bf in Install crank and chain ring see Rep1acine chain RING page 24 Position chain and guide it through the tension mechanism fig 25 Connect chain Your chain has the correct length if the tension mechanism of the chain ten sioner is pretensioned 2 but can still be moved upwards 3 fig 25 gt The Pinion chain tensioner is installed P1 18 p n on INSTALLATION WORK ADJUSTING CHAIN TENSION PINION CHAIN TENSIONER If your chain frequently hits the chain stay on your bicycle frame it may be necessary to increase the chain tension If the chain or cranks continue to rotate although the rear wheel freewheel operates correctly o
15. on eu www pinion eu
16. pinion Owner s MANUAL pinion MADE IN GERMANY CONTENTS INTRODUCTION Foreword Symbols Technical DATA Development Tightening torques SAFETY Intended use 8 Basic safety instructions 8 R p na Before every ride Shifting correctly LO ss Al INSTALLATION WORK Installing rotary shifter 12 Installing or replacing the derailleur cable 13 Installing Pinion chain tensioner oo eee 22 Adjusting chain tension Pinion chain tensioner 23 Replacing chain ring 24 Chain length amp chain tension b Installing transmission 27 MAINTENANCE WORK Frequency 28 Adjusting shifting 29 Oil change iain SO LEGAL INFORMATION Liability ccsitincecasesneices 31 INTRODUCTION FOREWORD You are now the owner of a modern Pinion bicycle transmission made in Germany This owner s manual is a part of your Pinion product and contains information on how to operate adjust install and maintain your product safely Read this manual carefully before using your Pinion product Always observe and follow all instructions in this manual and also the user instructions from other manufacturers whose products are used on your bicycle chain wheels quick release skewers etc Remember that the mechanic is responsible for the suitability and compatibility of all components that interact with your Pinion product A WARNING
17. r if the chain tensioner rattles it may be necessary to reduce the chain tension Remove chain and remove it from the chain ring and sprocket Disconnect the spring leg 1 at the tension mechanism 2 Rotate the tension mechanism forward The screw 3 of the spring shaft is accessible Unscrew the screw 3 of the spring shaft 4 Move the spring end pin 5 counterclockwise gt The chain tension is increased Make sure that the square head of the spring shaft is in the same position in its opening in the base plate 6 as before Screw in the screw 3 of the spring shaft 4 and tighten to a tightening torque of 4N m 35 Ibf in Position the chain on the chain ring and sprocket Attach spring leg 1 to tension mechanism Check the setting and repeat the procedure if necessary 23 INSTALLATION WORK 10mm 10 N m 89 Ibf in max y g 2 4mm 6N m 53 Ibf in max gy 30 N m 266 Ibf in max 24 REPLACING CHAIN RING G If you need to replace the chain ring of your Pinion bicycle transmission be cause of wear different gear ratio you can order it and the required tool directly from us See www pinion eu for a selection of different chain rings Another method of changing the gear ratio is to replace the sprocket on your rear wheel G Chain ring sprocket and chain always wear on opposite sides during use This means that the drive stop working without problems
18. r key sleeves 1 fig 33 34 are installed flat in their seats in the transmission housing if necessary press in with a parallel pressing tool e g screw clamp suitable clamp etc fig 33 Follow the sequence and tightening torque fig 34 Make sure that all contact points between the transmission and bicycle frame bridge are clean Apply fresh screw locking fluid medium to the transmission retaining screws Position transmission in the bicycle frame bridge Position all screws Tighten screws in the specified sequence fig 34 to a tightening torque of 10N m 89 Ibf in gt The transmission is installed MAINTENANCE WORK FREQUENCY The frequency of use and weather conditions determine the frequency of maintenance work on your Pinion bicycle transmission l Carry out the following maintenance operations more frequently if you use E your bicycle under extreme conditions rain dirt long distances etc NOTICE O Corrosion and material damage by penetration of water 7 Never use a pressure cleaner or steam cleaner to clean your bicycle the seals tn _ E in the bicycle components cannot withstand this pressure 8 amp A 1 Be careful even if you use an ordinary hose Never direct a spray of water Nu Ey directly at the area of a seal fig 35 Clean the transmission housing with water detergent and a brush Clean the chain chain ring sprocket and if necessary the roller of
19. ssion In this case have your Pinion bicycle transmission checked by a specialist workshop for bicycles Do not ride with your Pinion bicycle transmission in temperatures below 15 5 F or above 40 C 104 F Incorrect riding behaviour or improper equipment may cause accidents Always obey the traffic regulations of the country where you are riding your bicycle lights reflector etc and also the regulations governing off road mountain biking Always wear a good quality undamaged bicycle helmet e g ANSI certified and clothing that is close fitting but does not hinder movement Ride your bicycle only when you are in good physical condition and your bicycle and all its components are in good condition RiDiNG 10 BEFORE EVERY RIDE A WARNING Component failure may cause accidents Before every ride make sure that the quick release system of your wheels is correctly installed and that your wheels cannot be accidentally released Before every ride make sure your brakes are operating correctly and the brake pads are not excessively worn Before every ride make sure your chain is correctly tensioned Never ride with your Pinion bicycle transmission if damage to the transmis sion housing cranks etc is visible unusual noises can be heard or if you have any doubts the condition of the transmission Have your Pinion bicycle transmission checked by a specialist workshop for bicycles A chain that
20. the chain tensioner Oil the chain lightly Check that all screw fasteners have the required tightening torque and adjust if necessary Check the tension and smoothness of the derailleur cable see Adjusting shift ing page 29 Check chain tension see Chain length amp chain tension page 26 Adjust chain tension if necessary see Adjusting chain tension Pinion chain ten sioner page 23 Check that the chain tensioner rollers move smoothly and inspect for wear excessive play loud running noises replace rollers if necessary fig 36 T20 2N m 18 Ibf in max 28 P1 18 p n on MAINTENANCE WORK ADJUSTING SHIFTING Your Pinion bicycle transmission is correctly adjusted if it shifts immediately cable tension all 18 gears can be selected with minimum force cable tension the display on the rotary shifter matches the selected gear synchronization Hold adjusting screws 1 2 and slacken lock nuts 3 fig 37 Adjusting cable tension The cable tension is in the correct range if the ends of the derailleur cable outer sleeves are within the stops on the transmission and rotary shifter with out play and are not under tension Unscrew both adjusting screws 1 4 revolution counterclockwise gt Cable tension is increased gt Force required is increased Or Screw in both adjusting screws Y revolution clockwise gt Cable tension is reduced gt Shi
21. your Pinion product in any way e g grinding drill ing painting etc Always use a torque wrench designed for the required torque at installation steps that require a specific tightening torque Keep your bicycle in good technical condition at all times Unsuitable accessories and additional components may cause accidents Use original Pinion parts and lubricants exclusively Use a rear wheel quick release system that reaches the required closing pressure of at least 4000N exclusively It is best to use a rear wheel hub that is permanently fastened with axle nuts in the rear triangle P1 18 p n on Use exclusively a bicycle chain with a width of 6 6 6 8mm 9 s or any other chain approved by Pinion see www pinion eu and an appropriately sized sprocket SAFETY Riding A WARNING Component failure may cause accidents Before every ride make sure that the quick release system of your wheels is correctly installed and that your wheels cannot be acci dentally released Before every ride make sure your brakes are operating correctly and the brake pads are not excessively worn Before every ride make sure your chain is correctly tensioned Never exceed the maximum approved rider weight see TecnnicaL Data page 6 Never ride with your Pinion bicycle transmission if damage to the transmission housing cranks etc is visible unusual noises can be heard or you have any doubts about the transmi
22. your transmission during your initial rides See www Pinion eu for many more tips and more information on your Pinion product We wish you all the best with your leisure and competitive riding The Pinion Team TECHNICAL DATA EES f O th or a Aen ne B gt optional additional chains approved by Pinion see www pinion eu Rider backpack etc 6 Type name Chainline A Q factor B Crank length C Crank hub Chain ring D Thickness chain ring E Dimension chain F Gears via rotary shifter Gear ratio total Gear steps constant Ratio in 1 gear at 21 24 Ratio in 18 gear at 21 24 Oil volume type Rider weight max mm Teeth mm ml oz kg Ib Qi a P1 18 54 174 175 170 Pinion Standard 24 2 6 6 6 8 9 speed 18 636 11 5 1 59 0 25 60 2 0 Pinion 110 243 P1 18 PINION m ft 0 29 5 0 26 2 7 0 23 0 0 19 7 4 0 13 1 3 0 9 8 2 0 6 6 1 3 4 3 1 5 4 9 1 0 3 3 4 I 1 2 3 4 5 6 0 16 4 4 j 1652 1869 2066 DEVELOPMENT G The specified values in m ft per crank revolution correspond to the recommended ratio for sprocket back chain ring front 21 24 0 875 The calculation fig 3 is based on tire size 26x2 2 55 559 You can find an Excel table for c
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