Tread width VS. Section width?
#16
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Joined: Aug 2005
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From: St. Charles, IL
Not sure if tire size limits is an issue in what you are doing but if a wider tire comes with a weight penalty, you may want to stay on the narrow tire.
This has been my mentality with SCCA Street Mod. With a 2.0L motor and 275 wide tires, you can run the car down to 2620 pounds. This is ~76.3 pounds/inch of tire width in the front. To match that grip ratio at the 2820 pound minimum means a 295-305 wide tires which means aftermarket fenders and lots of clearance issues. Even then, I have a feeling that 200 pounds less weight is going to be more beneficial in the end then a 305 tire.
This has been my mentality with SCCA Street Mod. With a 2.0L motor and 275 wide tires, you can run the car down to 2620 pounds. This is ~76.3 pounds/inch of tire width in the front. To match that grip ratio at the 2820 pound minimum means a 295-305 wide tires which means aftermarket fenders and lots of clearance issues. Even then, I have a feeling that 200 pounds less weight is going to be more beneficial in the end then a 305 tire.
You make a great point, however it doesn't apply to what I am doing. Due to the fact that I am full weight, have a turbo upgrade, catless, ext wg dump and a diffuser I am basically not competitive in any class that I am legal to run in.
Like I stated before, width clearance issues won't by my main problem; I have a 3 finger gap between my rear fenders and my 17x10 +18 w/ 255/40/17's right now and about the same up front and the car is lowered. The only thing I am really concerned with is the height of the tire.
Don't lie, you love that thread.
#17
Clearance was a huge issue for me on 275/35/18 and 18x9.5 +22. I have a 2 finger gap between the tire and fender and yet I've still caught the fender twice with the tire. Caught it once running -2.5* camber and caught it the second time running -4* of camber.
The clearance issue up front for me was mostly the fender lining and the front of the side skirt. I had to cut out most of the plastic on the side skirt that goes into the wheel well also had to bend some metal ut of the way that attaches the side skirt. There is also a seam that sticks out that had to be bent in. Other then that, I have the front of the fender spaced out 3/8" and have probably pulled the fender another 1/4". In the back, tight roll + 1/4" pull got it so that I just get minor tire scuffing.
The clearance issue up front for me was mostly the fender lining and the front of the side skirt. I had to cut out most of the plastic on the side skirt that goes into the wheel well also had to bend some metal ut of the way that attaches the side skirt. There is also a seam that sticks out that had to be bent in. Other then that, I have the front of the fender spaced out 3/8" and have probably pulled the fender another 1/4". In the back, tight roll + 1/4" pull got it so that I just get minor tire scuffing.
#18
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