The inter-8 hub has increased its gear ratio to 307%, compared to 244% of the Inter-7 hub. The Inter-8 hub also incorporates a closer gear ratio allowing a more efficient and comfortable pedaling cadence. A trully "all conditions" internal hub has arrived.

  • Highest Shimano internal hub efficiency
  • Double roller clutch engagement for smoother, quiester shifting
  • Center Lock rotor mount
Model Number SG-S501
Speeds 8-speed
Silent Clutch Yes
Gear Change Support
Shifting Power Modulator Yes
Driving Efficiency High
Shifting Lever SL-S500
Coaster Brake -
Roller Brake Compatible -
Dust Cap for V-Brake
Disc Brake Rotor Mount Yes
Hub Shell Material
Hub Shell Finish
Gear Ratio Total Difference 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
Gear Ratio 9
Gear Ratio 10
Gear Ratio 11
Axle Length 135mm
Over Locknut 187mm
Spoke Holes 32, 36H
Spoke Size 92.6mm
Sprocket Options 16, 18, 19, 20, 21, 22, 23T (16T: for Outward assembling only)
Chain Line 41.8mm
Cassette Joint CJ-8S20, CJ-8S40
Average Weight
Flange Distance (mm)
Spoke Hole PCD (mm)
Flange Diameter (mm)
Flange Width (mm)
Sprocket Thickness (mm)
Chain Size
Shimano Recommended Chain
Dishing Distance (mm)
Shifting Switch
Motor Unit