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Old 05-20-2009, 04:13 PM   #26
littlewhitewagon
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Quote:
Originally Posted by mosc View Post
First off, I never said there was a problem with the height of a 235/40/17 tire for a 06-07 WRX. The difference is exactly .22" which, btw, is more than 1/8th inch. Not that it's a problem, I'm just correcting your math which you seem to have forwarded to imply that I don't know something.

245/45/17 is 45 sidwall. It can handle up to a 30% stretch in spec. 245 on a 7.0" rim is 37.8% stretch, as we said before. It's a lot CLOSER to spec on an 45 sidewall but STILL out of spec.

Sorry if you don't like the word "stretch" being used to imply a wider tire than rim but it's fairly obvious what I mean and I cannot think of a more appropriate term.
The difference in height will vary from tire to tire, I should say that I used the Toyo T1R as a reference since they have a variety of sizes. You are correct that if you only use the math to find the height, then the difference (in raw) is 0.22".

I talked with someone at Toyo yesterday (because I can walk there from my office, or Nitto for that matter), and the practical effects of an ill-fitted tire (without getting into how to calculate everything since it is different for all cars since the vehicle weight and load is a variable) are:

Contact patch distortion
Sidewall rollover
Heat build up

However, in order to quantify all these things, we are going to get into lots of engineering work and measurements that most people will not understand or have the tools to take.
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Old 05-26-2009, 06:15 AM   #27
KaliKarver
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I don't want ppl to think that running a 235/40/17 is fine on a 17x7 if you are trying to do any sort of track duty. I bought it because A:I wanted to build up the rest of my car and B: needed some tires for the mean time. The KDW's are great tires, regarding their treadwear. For those that have posted, I'm not an idiot, and knew they would fit, as well as knew there would be a compromise for the width. I still love the rubber. It is the same reason I got Cobb springs. I wanted a great look while I saved the money to get my car to turn on a dime. The tires have been great, a little loud like I knew, but great wet handling. Cobb springs suck, but we knew that. Got the drop I wanted. If ppl want to throw 235's on a 7" rim they will work fine, depending on offset. Stock=straight. The KDW's have the XL load on the 235/40 sidewall which helps on the stretch.
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