They support up to an 11s cassette. I will also include the Carbon rim specific brake pads which are still in good condition with plenty of braking surface left.
Like most (but not all) of Mavic's existing Cosmic wheels, the Cosmic Pro Carbon SL Cs have 40mm deep rims, but these are a new rounded shape based on a NACA (National Advisory Committee for Aeronautics) profile. The rims are wide - 25mm external, 17mm internal. The idea is to integrate well with the wider tyres that most people are using now. Mavic recommends tyre widths from 25mm to 32mm. The Cosmic Pro Carbon SL Cs don't flex much at all when you fling the bike about out of the saddle or corner hard, 18 straight-pull elliptical spokes at the front and 24 at the rear holding them firm.
The wheels incorporate the Instant Drive 360 freewheel system (Shimano/SRAM fitted to this set) The design features a 40-tooth dual ratchet system that provides engagement in 9°. In other words, you start to drive the rear wheel almost immediately on resuming pedalling after coasting. Lightweight and fast full-carbon clinchers with excellent braking in both wet and dry conditions.This item is in the category "Sporting Goods\Cycling\Bike Tyres, Tubes & Wheels\Wheels & Wheelsets". The seller is "kecstain911" and is located in this country: GB.