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Will different tire diameters cause problems?

This is a discussion on Will different tire diameters cause problems? within the Wheels and Tires forums, part of the General Help category; I'm planning to put P245/45-17s on front (outside diameter 25.5") and P275/40-18s on back (outside diameter 26.6'). I have a ...

  1. #1
    Member sjgreen6's Avatar
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    Navy Blue
    2002 Trans Am WS6 Conv

    Will different tire diameters cause problems?

    I'm planning to put P245/45-17s on front (outside diameter 25.5") and P275/40-18s on back (outside diameter 26.6'). I have a 2002 TA with traction control. Is the difference in diameter between the front and rear going to cause me any problems with the ABS or traction control? I could drop down to a P275/35-18 (outside diameter 25.4") on the rear but there is a cost increase in the tire price that I'd like to avoid if the size differences aren't likely to cause problems.

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    Junior Member The Machinist's Avatar
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    NBM
    2001 Camaro SS SLP# 2646

    I got 40 up front 35 rear with no problems here. Haha that rhymed

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    James Bond Spikito's Avatar
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    2001 3.8 Black - sold
    2000 SS Black M6

    shouldn't be an issue, but there are some tire size calculators out there that will help. traction control works off of percentage difference, I THINK ours is 10%. your problem being larger in the rear, is that youll already be using several of those percentage points, so even just a little slippage with set off traction control, I think I ran 275/40 up front and 295/35 in the rear...whatever it was, my rear was actually a bit smaller, even though it was offset 17" and 18" like yours....So I could spin quite a bit more before I got shut down.


    Just say F-it and get traction control tuned out, lol

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    Smiles for 9.5 Years cammed goat's Avatar
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    Phantom Black Metallic
    2004 GTO M6

    I would go with the 35s in the rear. I have the factory 245/45ZR17 on my factory wheels and run 245/40ZR18 on the front and 275/35ZR18s on the rear of my summer wheels.

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    Member sjgreen6's Avatar
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    2002 Trans Am WS6 Conv

    Thanks all, very helpful responses. My difference is right at 5% between the two tire sets. I think I'm going to take the risk and go with the 40 series in the rear. Totally on me if it doesn't work out. Will post when I get them installed and tested.

  6. #6
    Member sjgreen6's Avatar
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    Navy Blue
    2002 Trans Am WS6 Conv

    Got the tires installed and put on the wheels. Decided to go with Nitto 555s P245/45-17 front and P275/35-18 rear. Very happy with the ride and look.

    paxside-1.jpg
    Last edited by sjgreen6; 04-21-2013 at 02:31 PM.
    Blackwing Lid, SFCs, Y-pipe, LM2, Frost Tune, Corvette N73 Magnesium Wheels, 4th Circle Designs Stripe and Overlay kit

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