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

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.

Specifications:

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

Compatibility:

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

Crank:

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

Features:

• 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

Technology:

Inter-8
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

Contents:

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