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The Tire Rack's Tire & Wheel Forum
Use this forum to discuss anything in relation to wheels to tires to offsets.
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Old 05-17-2011, 07:21 AM   #1
logical
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Aspect ratio out of control?

30+ years ago when I was first driving, you rode on 78 or 75 series tires. My first Mustang in the mid 80's had outrageous "low profile tires"...they were 60 series on 15 inch wheels. Around that time I think the Corvette went to 50 series and people thought the world was coming to an end.

I know it's somewhat technology advancement that allows it, part performance advantage and no doubt a styling thing but to me it just seems to have gone too far. I drive an xi and it's my daily driver for 25-30,000 miles per year on all kinds of roads. The 50 series tires on 17 inch wheels are about as far as I'd want to go and in the winter pothole season I've got a 55 series 16 inch set-up.

Once you get below a 50 series is there really a handling payoff. I'm just curious, I think you should run what you want and if 35 series floats your boat, great...they do look cool I suppose.
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Old 05-17-2011, 12:52 PM   #2
Penguin Koolaid
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The sidewall ratio means nothing without knowing the width of the tire. 205/50R17 is the same height as 225/45R17.

Additionally, you need to consider the brakes (most notably the calipers) on a vehicle when determining wheel size. I cannot fit a 16" wheel on my car without hitting the calipers. There are some cars out there with brakes so large they require larger wheels, and thus tires with lower profiles.
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Old 05-17-2011, 01:54 PM   #3
logical
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Quote:
Originally Posted by Penguin Koolaid View Post
The sidewall ratio means nothing without knowing the width of the tire. 205/50R17 is the same height as 225/45R17.

Additionally, you need to consider the brakes (most notably the calipers) on a vehicle when determining wheel size. I cannot fit a 16" wheel on my car without hitting the calipers. There are some cars out there with brakes so large they require larger wheels, and thus tires with lower profiles.

Yeah, I understand the math and the practical need to clear larger brake components. The point is the general trend toward more wheel and less sidewall height. Stock run of the mill E46 tires are a little over 25 inches diameter whether 205/50/17 or 205/55/16 and both front and rear M3 225/45/18 and 255/40/18 tires are still only about 26 inches diameter. I don't think even those with 19 inch wheels are going to a tire that's significantly larger diameter....and even if it is an inch bigger it's as much as 3 inches more wheel involved.
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