Wider Tires on stock IROC 15" rim
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Wider Tires on stock IROC 15" rim
Does anyone know what tire size I would need to get a wider profile on the stock 15" IROC rim? I currently have the stock 215/65/15's but think they're too narrow and I want the wider look of 245/50-16's. While of course making sure there is no rubbing and the car still handles well.
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From: SO CAL
Car: '88 Firebird Z20
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Re: Wider Tires on stock IROC 15" rim
I've been looking at 245/60/15 also in the last couple days for the rear of my Bird, they're getting pretty worn, they should fit fine being that I had 285/30/19 on there a couple months ago. Later.
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Re: Wider Tires on stock IROC 15" rim
i am running 255/60 15 on the front and 275/60 15 on the rear.
they fit fine. 255 is as big as i can get on the front and 275 is max for the rear with stock rims. actually 255 is perfect for the rims - 275 is a little big as minimum rim width is supposed to be 7 1/2 inch and im only at 7.
pics in my profile.
they fit fine. 255 is as big as i can get on the front and 275 is max for the rear with stock rims. actually 255 is perfect for the rims - 275 is a little big as minimum rim width is supposed to be 7 1/2 inch and im only at 7.
pics in my profile.
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Re: Wider Tires on stock IROC 15" rim
I'm running 235/60/15 up front and 245/60/15 out back. Here's a pic, more in the sig as well:
14215387.jpg?t=1243096882
14215387.jpg?t=1243096882
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Re: Wider Tires on stock IROC 15" rim
I've used 245/50/15 on stock 15" camaro rims with no problems. Exact same size tire you're looking at, just for a 15" rim. Obviously the first number is tire width, but as I understand it, the second number, which I BELIEVE is the aspect ratio, determines the height of the sidewall. The number is a percentage of the tire width, so assuming you do nothing to the width, decreasing the second number, decreases the profile of the sidewalls. So....If you currently have 215/65/15, as you increase the first number, or tire width, by 10 (I believe cm, but I have NO clue) you should decrease the aspect ratio, or second number, by 5, (%) assuming you'd care to keep the stock tire height of course. 215/65/15, 225/60/15, 235/55/15, 245/50/15...should all be very close to stock height.
Last edited by cavazos31; May 25, 2009 at 06:34 PM. Reason: wrong wording
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Car: '85 Z28
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Re: Wider Tires on stock IROC 15" rim
I've used 245/50/15 on stock 15" camaro rims with no problems. Exact same size tire you're looking at, just for a 15" rim. Obviously the first number is tire width, but as I understand it, the second number, which I BELIEVE is the aspect ratio, determines the height of the sidewall. The number is a percentage of the tire width, so assuming you do nothing to the width, decreasing the second number, decreases the profile of the sidewalls. So....If you currently have 215/65/15, as you increase the first number, or tire width, by 10 (I believe cm, but I have NO clue) you should decrease the aspect ratio, or second number, by 5, (%) assuming you'd care to keep the stock tire height of course. 215/65/15, 225/60/15, 235/55/15, 245/50/15...should all be very close to stock height.
215/65/15: 26.00"
245/60/15: 26.57"
245/50/15: 24.65"
Here's a good link for calculating tire height:
http://www.wallaceracing.com/tire-aspect-calc.php
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Re: Wider Tires on stock IROC 15" rim
When I bought my car the previous owner had 295/50/15 on the stock rims? wtf? I still have them sitting in my shed. havent bothered to have the tires removed from the rims yet. My old car was running 235/60/15 front and 255/60/15 rear and fit good. My current car is running 275/40/17 all the way around on Konig 17X9 rims and fit great!
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