do 285/40YR17 fit?? - Team Camaro Tech
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post #1 of 5 (permalink) Old Mar 22nd, 04, 03:42 AM Thread Starter
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Josh
 
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In my quest for a slightly taller tire I am looking at a 285/40YR17 and wondering if it will fit. I have 5.5" back spacing on a 9.5" rim. The car is slightly lowered...1.5" in the back. Tire rack shows the section width to be .5" wider than the 275/40. What do you think?

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post #2 of 5 (permalink) Old Mar 22nd, 04, 03:58 AM
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Chevy HP says the maximum you can use is a 275/40 without major modifications. Even a 275/40 usually needs the outer lip pushed in as much as possible to prevent rubbing. So a 285 is not going to fit without other modifications or severe rubbing.

Chevy HP Rear Maximum
17 inch wheel, 5.50 backspace, 9.5in width, 275/40 tire

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post #3 of 5 (permalink) Old Mar 22nd, 04, 05:46 AM
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Using the Nitto 555's I have as an example

255/45 = 25.95" tall, 10.08" sect
275/40 = 25.59" tall, 11.02" sect
285/40 = 25.95" tall, 11.38" sect

Looking at BFG G-Force it's about the same...

255/45 = 26.1" tall, 10" sect
275/40 = 25.7" tall, 10.9" sect
285/40 = 26.0" tall, 11.4" sect

With a taller tire you are putting more of the section width into the area of the fender lip and will want less section width to fit without rubbing. The 255/45 is my safe choice and I agree the 275/40 is the limit, and then may require fender lip modification... You're asking for trouble with a 285/40...

...Dennis

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post #4 of 5 (permalink) Old Mar 22nd, 04, 02:06 PM
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Hey J,

I will be putting 285/40/17 on my 69 with Hotchkis leafs in the near future. I know most say go with 275 but the BFG KDW's were on sale $155 each. I have talked to a couple of guys and they have no problem at 5.5 bs. Here is a link to one from the pro-touring.com site although he is using an 18 inch tire, the width should be the same.http://www.pro-touring.com/featured_..._69_camaro.htm

Just copy and paste I can't get it to work.
Let us know how you make out if you go ahead with your plan. [img]graemlins/waving.gif[/img]

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post #5 of 5 (permalink) Old Mar 22nd, 04, 03:05 PM
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285/40/18's have an 11.4" sect width and are 27" tall. That's the same sect width as the 285/40/17's. That will leave you about 1/8" of clearence on the inner fender wall if everything in your rear suspension is perfect... You will gain some with disc's over drums but will loose that on the outside... 275/40/17's are a tight fit, Please post back once you've been around the block, I hope you can make them work...

Edit: I went to the link posted,
http://www.pro-touring.com/featured_..._69_camaro.htm

John is running 285/35/18's which is almost identical overall measurments to the 275/40/17

...Dennis

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