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I've got a 29er Riba with standard XT brakes so I guess that is 165mm rotors and the mounts are international standard.
What do I need to do if I want to get a bigger rotor on there, it is just a matter of an adapter and a bigger disc or do I need to do something more complicated?
no bigger disc and adapter check the maximum rated size for your fork and swa[ pver. Make sur eyou know whther the brak enad mounts are IS or post
Brake is IS mount. How do I know what adapter to get?
What type of mount is on the fork?
What type of mounting on the caliper?
If both are IS then [url= http://www.chainreactioncycles.com/Models.aspx?ModelID=13736 ]this[/url] will allow you to run a 185mm disc
Various adaptors here depending on the combination
http://www.chainreactioncycles.com/Categories.aspx?CategoryID=563
Follow up question:
I ride/race XC but I am about 15 stone - hence wanting more stopping power. Should I get 180mm or 203mm rotors?
I'm heavier than you and find 180 front/160 rear more than enough.
personal choice 203 is bigger has more stopping power but also a weight penalty.
I think I'll probably go for the 180s, just thought I'd ask.
Somehow it seems odd to put 203 on a hardtail 29er XC race bike anyway 🙂
Now to find out about that adapter...
Just an aside, if you're fitting a bigger disc its probably worth being a bit more rigorous cleaning/servicing the fork.
When I eventually wore my Rebas out, it was on the disc brake side (I like stoppies...) so I imagine a bigger disc/bigger wheel would accelerate this. Cleaning and re-lubing the lowers on Rebas is even easier than on foxes, so its worth keeping on top of.
I was considering servicing them but I haven't managed to find any suspension grease yet (judy butter) and it is a very easy job to keep putting off...
203mm Juicy Threes on my Rebas with no problems.
I run 203mm Shimano rotors on both my 29er Reba forks with no problems. i weigh the same as you. I have 180mm on my Rigid SS which seems ok but i still prefer the biggest discs i can fit on generally. That's a personal choice though.