From reading posts about what I'm going to do with my 10" wide rims when I get them, 295 is as narrow as you could go on a 10.5" rim to have wheel protection, etc. I know 275's will fit on a 10" rim but it will leave little rim protection if at all, so a 285 would be very tight on a 10.5" rim. I'd look at 295's at least!
True. Sorry about that. Looks like you may have to go to sumitomo's with the 315 size. Hopefully someone else can help.
305 or 315. Don't skimp on rubber - thems all that keeps you from sliding into a ditch, off the track, or into the back of a car that suddenly brakes in front of you.
Thats a little too skinny for a 10.5" wide wheel in my opinion. Sumitumo 315's even still leave a little lip on the rim showing.