Trying to make a tire decision HELP!!

[stoney667]

I just picked up some 15x8 3.5 backspacing weld prostars. What tire would fit the best? MT ET Street Radial 275/50 or 275/60. Going on an 84 cutlass that has a 4 link, qa1's, and other goodies from dick miller racing. Rear is SOLID does not move much at all.

 

[LS1GN]

Is the 60 narrower than the 50? Usually is. Remember that section width (inflated) is wider than tread width. I run the 255 50 Mickey Ts on an 8 inch rim - tire a little too wide for the rim. I think the 275 would be really wide. You might need a spacer to pull the sidewall away from the frame. The backspace is good though, which puts the tire farther out.

I'd mount an empty rim on there and grab a tape measure.

 

[stoney667]

The 275/60
Tire Tread Width: 9.5''
Tire Section Width: 11.0''

The 275/50
Tire Tread Width: 10.5''
Tire Section Width: 11.3''

So yea I guess it is slightly skinnier. I don't really see anyone running the 3.5 backspace with the 275's. I see most ppl running a 4 or 4.5.

They don't make the Welds in 4 though. Its 3.5 or 4.5. I think the 4.5 and then putting a spacer might of been the better choice now that i'm thinking about it. If its 3.5 I can't space it out anymore. After searching this for ever I still don't get the result I want.

Anyone running this combo?