Group shimano deore xt m8100 4 pistons, 170 mm, 32t, 10-45 i-spec evthis group includes:im8120jrrxsa170 - shimano deore xt brake (kit) brm8120ktblm8100 right / rear resin with fin without adaptor 1700 (black)irdm8100gs - shimano deore xt rear derailleur rd-m8100-gs 12 speedifcm81001cxx - shimano deore xt crankset fcm81001set 12 speed 170.0 mm without chainring colour seriesim8120jlfxsa100 - shimano deore xt brake (kit) brm8120ktblm8100 left / front resin with fin without adaptor 1000 (black)ismcrm85a2 - shimano deore xt chainring sm-crm85 12 speed 32ticsm8100045 - shimano deore xt cassette cs-m8100-12 12 speed 10-12-14-16-18-21-24-28-32-36-40-45ticnm8100126q - shimano chain cn-m8100 hg 12 speed e-bike rated 126 links quick-linkislm8100irap - shimano deore xt gear shifter slm8100rsetCrankset Teeth: 32TCassette Teeth: 10-45Crank Length: 170 mm