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Surly OD Bottom Brackets
} Allows the use of a 7 speed Shimano cassette on an 8 or 9 speed Shimano cassette body
Installs simply with one hand and is quick and easy to change between bikes
Low profile design with narrow carbon fiber injected shell for stiffness and light weight
available in 68mm or 73mm
SRAM X1 Type 2.1 11sp Rear Der Medium Cage Blk MFPN=11.6218.030.270 Surly OD Bottom BracketsSRAM X1 Rear Derailleur 11 Speed Medium Cage Black. The X1 group has all the important features of the high priced spread with a modest increase in weight. Wide tooth narrow tooth pulley wheel maximizes chain control by fitting inner and outer chain links perfectly X Horizon design maintains constant chain gap across all gears and eliminates ghost shifting Roller bearing clutch eliminates derailleur bounce and chain slap Cage Lock feature simplifies
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