Shimano 12s FC-R7100 172.5mm 52-36T

Designed with optimized rigidity, strength, weight, and rotational performance. Hollowtech II construction reduces weight while maintaining strength for superior power transfer. Available in five crank lengths: 160, 165, 170, 172.5, and 175 mm. Two gear options: 50-34T and 52-36T. Q-factor: 148 mm