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Dynamal alloy used in the extrusion has high tensile strength and yield without affecting fatigue life
Fits up to 700x48c or 650x2
B17 is Brooks flagship model and has been on the market for over 100 years 1st appearing the 1898 catalog
Flexible mesh back
absoluteBLACK Premium Oval Road Chainring 4x110BCD 50T - Blk MPFN-DROPOUT-322 Dynamal alloy used in theabsoluteBLACK Premium Oval 110 BCD Road Outer Chainring for Shimano Dura Ace 9000 50t 110 Shimano Asymmetric BCD 4 Bolt Black. absoluteBLACK Premium Oval 110 BCD Road Chainrings utilize absoluteBLACKs top tier design features to greatly improve traction and speed. They are designed for Shimano 4 bolt cranks like Dura Ace 9000 Ultegra 6800 105 5800 and others. Optimized with smooth shifting in mind premium chainrings have a 6 point ramp and recess
