SM-BB90 - Bike Components
Contents
1. of chain cannot be used If the chain keeps coming off the chainrings during use replace the chainrings and the chain You should periodically wash the chainrings in a neutral detergent and then lubricate them again In addition cleaning the chain with neutral detergent and lubricating it can be an effective way of extending the useful life of the chainrings and the chain Parts are not guaranteed against natural wear or deterioration resulting from normal use For maximum performance we highly recommend Shimano lubricants and maintenance products For any questions regarding methods of installation adjustment maintenance or operation please contact a professional bicycle dealer Technical Service Instructions SM BB90 Specifications SI 1L80A 001 Bottom Bracket Applicable front chainwheel FC M970 FC M770 Bottom bracket shell width 68 73 mm Thread dimensions BC1 37 68 73 mm Installation of the adapter Use the TL FC32 36 special tool to install the right adapter counterclockwise thread the inner cover and the left adapter clockwise thread Tightening torque 35 50 N m 305 435 in Ibs Left hand adapter Inner cover E Spacer installation method 1 Check whether the width of the bottom bracket shell is 68 mm or 73 mm 2 Next install the adapter while re Right hand adapter erring to the P P 68mm illustrations bel2. General Safety Information A WARNING Before riding you should carefully check your crankset to make sure that there are no cracks and if you find any sign of a crack or any other unusual condition do NOT use the bicycle Be careful not to let the cuffs of your clothes get caught in the chain while riding otherwise you may fall off the bicycle Check that the tension of the chain is correct and that the chain is not damaged If the tension is too weak or the chain is damaged the chain should be replaced If this is not done the chain may break cause serious injury If the inner cover is not installed correctly the axle may rust and become damaged and the bicycle may fall over and serious injury may occur as a result Obtain and read the service instructions carefully prior to installing the parts Loose worn or damaged parts may cause the bicycle to fall over and serious injury may occur as a result We strongly recommend only using genuine Shimano replacement parts Obtain and read the service instructions carefully prior to installing the parts If adjustments are not carried out correctly the chain may come off and this may cause you to fall off the bicycle which could result in serious injury Read these Technical Service Instructions carefully and keep them in a safe place for later reference Note Make sure that the chainring combination matches the front chainwheel tooth con
3. figuration in the Product specifications table If other combinations are used the distance between the chainrings will be incorrect and the chain might slip off and get caught in between them When the chain is in the position shown in the illustration the chain may contact the front Front il i chainrings or front derailleur and generate chainrings noise If the noise is a problem shift the chain onto the next larger rear sprocket or the one Rear after i sprockets l ji ll I If the bottom bracket shell is not parallel gear shifting performance will drop Before riding the bicycle check that there is no play or looseness in the connection Also be sure to retighten the crank arm fixing bolt at periodic intervals BB FC FC PD If a squeaking noise is heard coming from the bottom bracket axle and the left crank arm connector apply grease to the connector and then tighten it to the specified torque If you feel any looseness in the bearings the bottom bracket should be replaced In addition if pedaling performance does not feel normal check this once more Do not wash the bottom bracket with high pressure jets of water When installing the left and right adapters be sure to install the inner cover too otherwise the waterproofing performance will drop Apply grease to the left and right adapters before installing them To ensure the best performance be sure to use only the specified type of chain The wide type
4. ow 73mm 68 mm Band Type 68 mm Bracket Type 2 5 mm 2 5 mm 2 5 mm Lao 2 5 mm T E E E type bracket 73 mm Band Type 73 mm Bracket Type 2 5 mm E ja P TT For bracket type Install as shown in the illustration Front Derailleur Front Chainwheel p _ Adapter oO Adapter Tightening torque 35 50 N m 305 435 in Ibs Be sure to read the service instructions for the Front Drive System in conjunction with these service instructions SHIMANO SHIMANO AMERICAN CORPORATION One Holland Irvine California 92618 U S A Phone 1 949 951 5003 SHIMANO EUROPE B V Industrieweg 24 8071 CT Nunspeet The Netherlands Phone 31 341 272222 SHIMANO INC 3 77 Oimatsu cho Sakai ku Sakai shi Osaka 590 8577 Japan Please note specifications are subject to change for improvement without notice English May 2008 by Shimano Inc XBC SZK Printed in Japan
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