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HOLLOWTECH II is a technology that allows the integration of the lower support axle into the right crankset. This translates into increased stiffness and better balance, increasing the comfort of your ride.
1-row
The single-row crank stands for high strength and high reliability. It provides effective support on ascents and allows maximum speed on level ground. It positively influences the comfort from the activity.
Hollowtech II is a technology developed by Shimano to improve crank mechanisms. This technology makes the mechanisms lighter, stronger and more efficient. A characteristic feature is the integration of one of the crank arms into the axle.
Shimano GRX crankset FC-RX820-1 40T 12rz 175mm black
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