C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Rear Tires: 285 or 275

Old 07-26-2001, 09:18 AM
Polar LT4
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I have an 96 LT4. The current tires on it are 255/45-17 (17X8.5 rim) on the front and 285/40-17 (17X9.5 rim) on the rear. I was thinking about geting some Kumho ECSTA tires, but they don't make the 285/40-17. What would be the downside of going down to a 275/40-17 (down from the 285's) & keeping the 255's up front? I eventually would like to go to 275's on all four corners, but don't have the money for new rims for the fronts now.

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Old 07-26-2001, 10:29 AM
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You can do it if you must , but the bigger the better, I would think an LT4 would have a traction problem even with the 285's.....
I've run all the combo's and 285/315 is the best.......ZR1's run 285/ could try 275/285............but I found the road ruts are still a problem with this setup....going to 275 all four corner's gives you the "rotation" advantage....

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Old 07-26-2001, 10:41 AM
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Don't worry about it. I've run both 275 and 285 and the difference is negligible.

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Old 07-26-2001, 12:07 PM
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Okay, correct me if I'm wrong, but I thought ZR-1's ran 275's up front???

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Old 07-26-2001, 02:26 PM
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I did the EXACT same thing you are talking about PolarLT4, except I have an LT1. I'm very happy with my decision. The Kumho 275's look really good. I love how they don't stick out from the rim at all. I love the tires too. Mathematically your diameter is going to be a little bit smaller so your wheels are going to have to spin a little bit faster. It equals out to a few MPH on the speedo when you're going about 85. Not a big difference.

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Old 07-26-2001, 03:55 PM
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Originally Posted by R94 LT 1
Okay, correct me if I'm wrong, but I thought ZR-1's ran 275's up front???

You are correct ZR1's come with 275 front and 315 rear.

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Old 07-26-2001, 09:42 PM
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The difference between the two sizes is 10 millimeters, that's less than 1/2 inch.(from sidewall to sidewall) I don't think the difference in the tread would be too much, at least not enough to make a difference.
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