What I have been told is go one size up from your existing 26" set up in the front. The rear is less dependent. I run 160's on my 26er, so I would get a 160 for the rear and 185 for the front, for instance. I weigh 160 or so and ride mainly xc-ish stuff. Hope that helps. Also check in with the peeps on the 29er forum.rivrmutt said:What size rotor is best for a 29er? I found 185's and 203's on ebay, just not sure which way to go.
By the way anyone ever here of Gatorbrakes? Pricepoint has them for 30 buckz