Group shimano grx 810 11v mecha double, 170 mm, 48x31t , 11-32this group contains:ifdrx810f - shimano grx front derailleurs fd-rx810-f double down swing braze-on color seriesirx8102dlf6sc100a - shimano grx brake (kit) brrx810ktstrx810st left / front resin with fin assembled front bracket for 160 mm 1000 disc (black)ifcrx8102cx81 - shimano grx crankset fc-rx810-2 11 speed 170.0 mm 48-31t color seriesirx8102drrdsc170a - shimano grx brake (kit) brrx810ktstrx810st right/rear resin with fin without adapter, for 25 mm rear mounting thickness 1700 (black)icsr800011132 - shimano ultegra cassette cs-r8000 11-speed 11-12-13-14-16-18-20-22-25-28-32tirdrx810 - shimano grx rear derailleur rdrx810set 11-speedicnhg70111116q - shimano chain cn-hg701-11 hg-x11 e-bike rated 116 quick-link linksCrankset teeth: 48x31TCassette teeth: 11-32Crank length: 170 mm