To mount an IS caliper onto a post mount fork and increase your rotor diameter by 20mm (for example, IS caliper for 160mm rotors, fork with post mount for 160mm rotors, use this adaptor and you can use 180mm discs) Came on a set of brakes I bought off here. anodising is worn off in a few places, used condition. £8 posted. Let me know if you want it!
Cheers.
