Ultegra SL HollowTech II chainset offers a fine balance of light weight and rigidity with incredible shifting performance
The Features of the Shimano Ultegra SL HollowTech II Double Chainset FC6601 are:- HollowTech II allows the bottom bracket bearings to be spaced wider apart (outboard the frame) enabling the use of larger bearings and an increased axle diameter
- Their is also the benefit of easier installation , adjustment and maintenance
- Lightweight and rigid steel bottom bracket axle
- SG-X aluminium anodized chainrings
- Available in 165 mm, 170 mm, 172.5 mm and 175 mm
- Aluminium chainring bolts
- Weight 797g (53 / 39T, 170 mm including bottom bracket)
- Bottom bracket not supplied