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The 10-50t 12-speed cassette offers an optimal 500% gear range with significant weight savings in a 1x system
FD/Shifter Compatibility Dura-Ace 7970 Di2 FD/Shifter Compatibility Shimano Ultegra Di2
5 Crank Arm Material Aluminum Chainring BCD 104 Chainrings Included No Spindle Material Steel Defined Color Black Bore 24
}Surly Single Cassette Cog 3/32" Splined 16t
Campy 12sp
Bosch Design Cover Performance Line Left Bottom (BDU33YY) - The smart system MFPN=63624 The 10-50t 12-speed cassette offersBosch Design Cover Performance Line Left Bottom BDU33YY The smart system Compatible. Bosch Performance Line drive unit replacement covers
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