Take your e-bike to the highest level of comfort and performance with the Shimano Alfine SG-S7051 Di2 . This 8-speed hub combines the proven Alfine platform with electronic Di2 shifting , ensuring smooth, precise, and low-maintenance shifting under all conditions.

 🔧 Technical specifications

 
 Number of gears : 8
 
 Brake type : Disc brake (Centerlock)
 
 Axle length : 187 mm
 
 Installation width : 135 mm
 
 Spoke holes : 36
 
 Flange distance : 57.3 mm
 
 Flange diameter : 104.3 mm
 
 Pitch circle diameter : 92.6 mm
 
 Hub material : Aluminum
 
 Color : Black
 
 Model code : SG-S7051
 
 Shimano group : Alfine Di2


 ⚙️ Shift range & ratios
 The Alfine Di2 offers a total gear range of 306% , ideal for urban use, hilly terrain and touring.
 The gear ratios are:
 0.527 – 0.644 – 0.748 – 0.851 – 1.000 – 1.223 – 1.419 – 1.615
 Including direct drive in fifth gear for optimum efficiency.

 🔌 Di2 – Electronic shifting
 This hub is designed for use with Shimano's Di2 (Digital Integrated Intelligence) system:

 
 Switches electronically and silently
 
 Always accurate – no cable wear
 
 Compatible with automatic shifting on e-bikes with Shimano STEPS


 🔗 Compatibility

 
 Recommended chain : CN-HG93, CN-HG53, CN-HG50
 
 Recommended gears : CS-S500, SM-GEAR
 
 Can be used with belt drive or chain


 🚲 Found on top bikes such as:

 
 Gazelle Chamonix S8
 
 Sensa Cintura
 
 Koga Supermetro 8 / F3
 
 Riese & Müller UBN Seven
 
 Trek District
 
 Giant Anytour
 
 Cube Editor FE
 
 Liv Allure CS


 ✅ Perfect for:

 
 Luxury city bikes and commuter bikes
 
 E-bikes with Shimano STEPS system
 
 Cyclists who value comfort, low-maintenance technology and smooth shifting