Shimano Ultegra® FH-6600 Rear Freehub

While the grade of materials and the surface treatment of the races may change between groups, one thing is constant.  Shimano hubs exclusively use a cup and cone bearing system in all of its hubs. Cup-and-cone bearings offer greater strength than sealed cartridge bearings due to their ability to displace lateral and vertical loads more effectively for super smooth rotation in real world riding conditions.

Cup-and-cone bearings also allow for easier maintenance, adjustability and serviceability.

Features:

●  Both 10-speed and 9-speed compatible.

●  Smooth rolling: Super polished ball races for high precision, durability and smooth rotation.

●  Internal Grease Sleeve: Helps increase durability.

Specifications:

●  No. of Sprockets - 10,9,8-speed

●  Over Locknut 130mm

●  Axle Length 141mm

●  Spoke Holes 36/32/28/24, 24 (aero)

●  Spoke hole Circle - 45mm

●  Sealing labyrinth and contact seals

●  Freehub Body - steel

●  Hub Shell - forged aluminum/anodized

●  Center to Flange - Right : 20.8mm, Left:38.4mm

●  Average Weight (QR Weight) 347g (64g)