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Old 06-17-2013, 08:09 PM
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wider tires in the rear

My 1981 Firebird has posi traction rear end with a 3:73 rear gear and I have been wondering if it would be worth wild to put a little bit wider wheel like a 205 75 15 I have 205 70 15 on it now and I am just think on the back put the wider tires thanks

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Old 06-17-2013, 08:19 PM
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70 to 75 just make the tire taller not wider
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Old 06-17-2013, 08:59 PM
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Oh my bad then. If went to a 225 would that make a different it has Pontiac rally II rims
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Old 06-17-2013, 10:35 PM
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Check the manufacturer of the tire you want to put on the car. They usually have a list of how wide a tire you can go for a certain size rim.

How wide is the rim? 7"? 8"?

If you go too wide or narrow it can significantly reduce the life of the tire and cause unwanted handling side effects. In other words unsafe.

The list will also have the heights of the tires which you probably want to keep the same as what was originally on the car.
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Old 06-17-2013, 10:45 PM
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Here is a list from General Tire on their Altimax HP to give you an idea what kind of chart to look for. Tire sizes should be very close for different manufacturers using this chart.

AltiMAX HP

It lists recommended rim widths and heights also. I couldn't even find a 70 series tire. That's pretty tall!
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Old 06-18-2013, 07:32 AM
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make sure you match the spare(height wise) to the rear tires,just for convenience. take into consideration that height also affects the gear ratio.there are lots of tire and wheel combos available (some cheap) for that car.
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Old 06-18-2013, 08:29 AM
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My rims are I think 15x7 I put a 205 75 15 on yesterday because I had a RIM from a night. on and I looked at it and it looks good with it on. the. guy who had it before me put really wide I think they was like 235 60 15 but I traded them because I want to go back to the original look because they was summit rims thanks
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