Too small. Some 315's even look small on 10.5's. My buddy has 315 Sumitomo HTR ZI's on his 10.5 bullitts and you can still see the inside of the lip of the rim.
315s would be the best choice for a 10.5" rim but its a good idea to look at actual sizes of the different brand of tires. Tirerack.com has actual measurements of their tires and what size rim they recommend it fit on.
yep get 315s the first time, i got 275s(!!!) when i first got my 10.5 inch rims and now i have 315 F1 gs/d3s, should got those in the first place, the 275s where a waste of money.
For all of you who have the Goodyear GS-D3's how many thousand miles did you get out of them! and I have had three sets of tires on these 10.5 inch rims 2 sets of sumitomas and one set of Nitto 555r drag radials. So I am looking for a tire that last a little longer the treadwear on the sumitomas are 160! The 285's will fit on a 11" rim