Check AE Bike. You need to know your bolt circle diameter in order to specify the correct ring. Go with a 46 or 48 ring and you should be fine. If your front derailleur is any less than Deore you will probably have to upgrade it, has to do with the amt. of swing they have...
EDIT: IIRC, the angle of swing on the cheaper fr der.s won't handle the larger diameter of the ring... so not the amt. of swing, but the relationship of the diameter of the ring to where the pivots are located on the der.
Last edited by Buzzbomb; 06-23-05 at 09:49 AM.