I've read This thread on STW and I think I might be able to use this one..http://clee-cycles.co.uk/esite/P1043/product
Thread: http://singletrackworld.com/forum/topic ... er-problem
If I'm reading it correctly I can get the 160 version for my 183 rotor without buying a new one.
Might be worth a try before another £30 on rotors
160mm Disc Calliper Adapter - no increase in rotor size - to mount a 160mm IS calliper on a post mount fork with a 160mm disc.
Will also fit a 180mm IS calliper to a post mount fork with a 180mm disc, or a 200mm IS calliper to a post mount fork with a 200mm disc. You do not have to go up a disc size
I have one of these exact adapters going spare if anyone wants it. £6 posted.
Beware it won't fit all fork and calliper combos, some have fatter post mounts than others - this adapter nestles in right next to the post.