honestly just based it on everyone else’s sizing on the forum. i later thought about why i didn’t go 295 instead of just following what everyone else was running...but it ended up working out because there is a chance you will run into a clearance issue up front. not with the fenders but with the inner tire and some of the suspension components. i believe there are two of us who ran into this issue running bridgestone 285’s which i guess have sidewalls that protrude more than usual. supposedly easily solved with a 3mm spacer. so id imagine you’d probably have to do that with 295’s