86FirebirdV8350

just wondering if 215/65/15's in the front and 255/60/15 in the back would be ok on my car (dont know why the guy had 215's in teh front, but they're new so im gonna keep them for now, but the backs are shot...can i put the 255/60's on the back?

iroczrockz

The 215/65/15's are what come stock on the car probably. I know they came stock on my 90RS Camaro. I believe your question will have to be answered with another question. How wide is your rim? If your rim can handle it the only concern I would think, on the back, would be the speedometer. The 215/65/15's have a tire diameter of 26". Stick close to that and you will be fine. For a reference a one inch taller tire will give you a reading of 62 mph when your speedo says 60. Personally I plan on getting a 17x9.5 rim and using a 275/40/17 or a 285/40/17 on back. It comes down to rim size though. Hope that helps.

iroczrockz

Sorry about the double post but I just did a search on www.tirerack.com and I used an average tire, BF Goodrich Rad. T/A 255/60/15 and it said you can use a rim width of 6.5"-10" and the overall diameter is 27.1" diameter. So your back tire would be 1.1" taller than your front tire. If you go to that site and view the specs on a tire you like it will tell you all of that info.

86FirebirdV8350

ok thanx i have the stock starburst(20 slot mag aluminum) ones that came with the car. when the guy gave me the backup rims they had the 255/60/15's on them so i know they'd fit cuz he did use them