Specifications:

• Shimano Alfine SG-7051-11 Internal Geared Rear Hub
• Di2 electronic shifting
• 11 Speed
• Center lock disc
• 32h
• 135mm OLD
  
• Black
• Does not include shifter, cog, cog snap-ring, axle nuts, non-turn washers & cassette joint (Small Parts Kit)
• Compatible with Nexus cogs
  
• New in box