Hope I don't sound stupid but when you state shim does this mean adding space between the wheel/hub and frame rails? Is this something like a washer of sort but for wheels?You'll likely need shim(s) to get the 275/60/15's off the frame rails with the 5" backspace.
probably means thin spacer, i have seen 1/4 inch spacers crack i'd imagine that a 1/8 would also crack maybe easier and faster.Hope I don't sound stupid but when you state shim does this mean adding space between the wheel/hub and frame rails? Is this something like a washer of sort but for wheels?
That is going to depend on how much power your car makes. What are your current 60' times ? Does your car spin at the line now ? You will be able to hit the tires harder with the 275/60/15 due to the sidewall being taller.PLEASE Someone Give Me Info..... I have 17x10 on Rear tires 295/45/17... I have these new race star 15x10 and putting Hoosier D/R 275/60/15.... Is there a big difference in the two Tires at the track.... I mean this is going to run about 1500 extra for the entire package???? Please what will I gain???
Take a look at Bryan's picture. See how the rear tires are flattened out and the sidewall narrowed? Can't do that as well with a 50, 45, 40 or 35 series sidewall. Some can hook with thinner sidewalls but I haven't seen many. That squish is what makes the tires grab for a good 60'. For the track, you could just find 2 inexpensive aluminum 15x8 rims and mount the 275/60/15 dr's on them. No need to drop $1500 on a set of rear track tires/rims for a few days at the track.