Shimano Alfine Di2 SG-S7051-11 Center Lock Disc Internally Geared Hub

Alfine Di2 SG-S7051-11 Internally Geared Hub by Shimano – quiet and highly efficient
With the Shimano Alfine Di2 SG-S7051-11 internally geared hub you can shift 11 gears electronically. It convinces with maximum efficiency (range over 400%) and silent operation. The SG-S7051-11 internally geared hub is designed for use on touring, city and e-bikes with Center Lock disc brakes. A shift servo and a power modulator facilitate operation.
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 S7050Application:City & TouringGears:11-speedBrake Type:Center Lock DiscAxle Type:10 mm bolt-on axleOver Locknut Dimension:135 mmSpoke Hole Count:32 hole, 36 holeTechnical Information:Range:409 %Material:AluminiumTechnology:Inter-11Axle Length:187 mmSpoke Size:13 gauge (2.3 mm) / 14 gauge (2.0 mm)Pitch Circle Diameter:92.6 mmFlange Diameter:104.3 mmFlange Width:3.2 mm right, 3.2 mm leftFlange Distance:57.3 mmOffset:3.15 mmCompatibility:Small Parts Set:SM-S705Motor Unit:MU-UR500 (with cable EW-SD50), MU-UR510 (with cable EW-SD300)Chain Tensioner (for vertical dropouts):CT-S500, CT-S510Sprocket:CS-S500, SM-GEARCrank:FC-S501Chain:CN-HG93, CN-HG71E-Bike:EP8 EP801, EP8 EP800 for Urban / Touring, EP6 for Urban / Touring, STEPS E6100, E6180, E5000, E5080Features:for Di2 shiftingoptimised inner construction for better gear changesbetter performance on e-bikes and conventional bicyclessilent freehubshift servoshift power modulatorhigh efficiencyanodisedTechnology:Inter-11
11-speed gear hubs from Shimano with Inter-11 technology are designed for disc brakes. They feature helical gearing for a smooth and comfortable ride. The roller clutch enables low-noise operation. The needle bearing delivers high drive efficiency as well as durability and is very easy to maintain. Inter-11 gear hubs are characterised by a wide gear ratio range, which makes them suitable for different types of terrain.

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-SGS705111BLsliver 32 hole:I-SGS705111BSblack 36 hole:I-SGS705111ALsliver 36 hole:I-SGS705111ASContents:1 x Shimano Alfine Di2 SG-S7051-11 internally geared hub1 x Shimano Center Lock cover