You will need to change your rims either way if you want a set of Baer Brakes. There are 2 kits:
1) Sport with 12" rotors
OR
2) Track with 13" rotors
The minimum size wheel you can use with 12" rotors is 16". The minimum size wheel for the 13" rotors is 17".
I think I remembered you mentioning you wanted some larger wheels at the meet. If thats the case, then get the 13" brakes since they are only $10 more. Ill be getting mine this summer.
