SHIMANO SG-S7051-11 Silver, 187 mm

The Shimano Alfine S7051-8 Hub Offers A Wide 307% Gear Range Actuated By Shimano Di2 Electronic Shifting And An Improved Internal Structure For Better Gear Engagement. It Is Approved For E-Bike And Non E-Bike Use And Is Available In Black And Silver. Features: - Higher shifting performance even under high chain tension induced by E-bike motors - Improvement is suitable for both E-bike and non E-bike use Specifications: - Average weight: 1670 - Bike Type_Mount Type: CENTER LOCK disc brake - Speeds: 8 - Gear ratio_Total: 307% - Gear ratio_1: 0.527 - Gear ratio_2: 0.644 - Gear ratio_3: 0.748 - Gear ratio_4: 0.851 - Gear ratio_5: 1 - Gear ratio_6: 1.223 - Gear ratio_7: 1.419 - Gear ratio_8: 1.615 - Shifting power modulator: yes - Spoke hole_32H: yes - Spoke hole_36H: yes - Axle length (mm)_187: yes - Shifting Structure: DI2 - Driving efficiency: High - Flange diameter (mm): 104.3 - Flange width (mm)_Left: 3.2 - Flange width (mm)_Right: 3.2 - Gear change support mechanism: yes - O.L.D. (mm): 135 - Offset (mm): 3.15 - P.C.D. (mm): 92.6 - Silent clutch: yes - Spoke size: #13/#14 - Flange distance (mm): 57.3 Technology: Center Lock: - The center lock system makes an easy rotor installation possible with spline mount and a lock ring. the lock ring mounting system reduces the total working hours by shortening the amount of time of both installation and de-installation. in addition, the secure fixing by the spline mount enhances precision and rigidity while improving braking efficiency. Power Modulator: - As for the front roller brake, the braking POWER MODULATOR system is built in the hub side to ease sudden lever power input for easy and stable braking control.