Shimano Ultegra FC-R8100 Ultegra 12-Speed Double Chainset Seatposts overlapping steel shells protect the

overlapping steel shells protect the internal steel cable

Serrated top pattern and bottom to anchor shoes even in wet conditions

It is compatible with both 10 and 11-speed freehubs

but can fit up to 40 mm tyres when you want more off-road versatility

Aero tube shaping

Shimano Ultegra FC-R8100 Ultegra 12-Speed Double Chainset Seatposts overlapping steel shells protect theDescription The HollowTech II 12 speed Ultegra chainset offers an ideal balance of light weight and stiffness, making it the perfect choice for both enthusiast and competitive riders HollowGlide hollow outer chainring gives vast improvements in rigidity by virtually removing outer chainring flex and hugely improves shift performance, even under high load The chainring teeth have been developed to work in conjunction with 12 speed HG chains for