Shimano Alfine Di2 SG-S7051-8 Center Lock Disc Internally Geared Hub

Item number: 50303
Alfine Di2 SG-S7051-8 Center Lock Disc Internally Geared Hub - black/32 hole
Alfine Di2 SG-S7051-8 Center Lock Disc Internally Geared Hub - black/32 hole
Alfine Di2 SG-S7051-8 Center Lock Disc Internally Geared Hub - black/32 hole
Alfine Di2 SG-S7051-8 Center Lock Disc Internally Geared Hub - black/32 hole
  • 100 day return period
  • Online since 1998
  • Trusted Shop 4.89 / 5.00

Alfine Di2 internally geared hub SG-S7051-8 by Shimano - high efficiency

The Shimano Alfine Di2 SG-S7051-8 electronic internally geared hub convinces with its high range (over 300 %), optimum efficiency and narrow gradation. This is an 8-speed internally geared hub for Center Lock disc brakes. The shift servo ensures pleasantly low operating forces. The SG-S7051-8 is available in black and silver and will also cut a fine figure on your city, touring or e-bike.

Guidelines for Replacing E-bike Components:

Before you replace components on your e-bike, please read through the guidelines for component replacement for CE-marked e-bikes/pedelecs with pedal assistance.


Series: Alfine Di2 S7050
Application: City & Touring
Gears: 8-speed
Brake Type: Center Lock Disc
Axle Type: 10 mm bolt-on axle
Over Locknut Dimension: 135 mm
Spoke Hole Count: 32 hole, 36 hole

Technical Information:

Range: 307 %
Material: Aluminium
Technology: Inter-8
Axle Length: 187 mm
Spoke Size: 13 gauge (2.3 mm) / 14 gauge (2.0 mm)
Pitch Circle Diameter: 92.6 mm
Flange Diameter: 104.3 mm
Flange Width: 3.2 mm right, 3.2 mm left
Flange Distance: 57.3 mm
Offset: 3.15 mm


Small Parts Set: SM-S705
Motor Unit: MU-UR500 (with cable EW-SD50), MU-UR510 (with cable EW-SD300)
Chain Tensioner (for vertical dropouts): CT-S500, CT-S510
Sprocket: CS-S500, SM-GEAR
Cranks: FC-S501
Chain: CN-HG93, CN-HG71
E-Bike: EP8 EP801, EP8 EP800 for Urban / Touring, EP6 for Urban / Touring, STEPS E6100, E6180, E5000, E5080


- silent freehub
- shift servo
- shift power modulator
- high efficiency
- anodised
- optimised overall riding comfort and efficiency
- higher shifting capacity even with the high chain tension typical for e-bike motors
- optimisation: suitable for both e-bikes and conventional bicycles


Shimano 8-speed gear hubs with Inter-8 technology have a total gear ratio of over 300 percent. Due to the close gradation of the gears, they enable a smooth, efficient cadence and thus greater comfort while riding.

Gear Change Support
Gear Change Support is a shift servo technology on Shimano gear hubs. It ensures that you can downshift quickly, precisely and without using a lot of force, as it uses part of the pedal force for this process. The pedal force acts against the shift cylinder to overcome its counterpressure and execute the gear change. The shifting force is thus reduced by 40 %.

Manufacturer Numbers:

black 32 hole: I-SGS70518BL
black 36 hole: I-SGS70518AL
sliver 32 hole: I-SGS70518BS
sliver 36 hole: I-SGS70518AS


- 1 x Shimano Alfine Di2 SG-S7051-8 internally geared hub
- 1 x Shimano Center Lock cover


  • black/32 hole: 1670 g


  • black/32 hole, out of stock
  • black/36 hole, in stock
  • silver/36 hole, in stock

Rate this product

Be the first and leave your opinion!

Customer Reviews

no reviews yet

Your opinion counts!

Be the first and leave a comment!