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Tire size options

This is a discussion on Tire size options within the Wheels and Tires forums, part of the General Help category; I just picked up some z06 wheels and they are 17x9.5 front 18x10.5 rear with 245/45 front tires 275/45 rears. ...

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    Rice killa 01NavyBlueSLPSS's Avatar
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    Tire size options

    I just picked up some z06 wheels and they are 17x9.5 front 18x10.5 rear with 245/45 front tires 275/45 rears. The front tires look really funky since they are practically stretched onto the rim. I have a pair of 275/40 nittos I can swap onto the front. Can I get away with running 45's in rear and 40's in front without effecting ABS?

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    Moderator 98TransAmWs-6's Avatar
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    I would think so, I believe the rule for the aspect ratio is that they need to be within 5 of each other. So like 40 in the front and 45 in the rear should be fine. I have 245/30/20 in the front and 275/35/20 in the rear. Similar to your set up so I would think you should be fine.

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    Rice killa 01NavyBlueSLPSS's Avatar
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    Are your rims 18 in back and 17 in front?

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    Senior Member 2001camaroSS's Avatar
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    im running 275/35/18 front and 315/30/18 rear without issue.

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    It's not the aspect ratio, it's the overall height of the tire. You might have problems. 275/40-17 is about 25.6" tall. 275/45-18 is about 27.75". Did you have problems with the 245/45-17's? They would be the same height as the 275/40-17 if mounted on a 8.5" rim. 9.5 is too wide.

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    Senior Member tatertot91's Avatar
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    Yep, you want the overall tour height as close to stock. If you're not the speedometer, odometer, and abs will be off especially with diameters that far apart.

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    Rice killa 01NavyBlueSLPSS's Avatar
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    So is my current setup close to stock?

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    Rice killa 01NavyBlueSLPSS's Avatar
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    I plugged in my predator and calibrated it for the rear tire size. So my speedo shouldn't be affected

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    You can correct for speedo based on the rear tire height. But the difference in tire height F-R can't be corrected although there is a margin for error built in. Based on the tire sizes you posted, your fronts will spin 792 revs per mile. The taller rears spin 754 revs per mile.

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    Rice killa 01NavyBlueSLPSS's Avatar
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    Quote Originally Posted by tremiles View Post
    You can correct for speedo based on the rear tire height. But the difference in tire height F-R can't be corrected although there is a margin for error built in. Based on the tire sizes you posted, your fronts will spin 792 revs per mile. The taller rears spin 754 revs per mile.

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    Interesting. Looks like I'm gonna fork out the dough for 275/35 rears 275/40 in front. Went and got a quote. 950 bucks with labor. Ouch

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    Don't you already have a pair of 275/40-17 Nittos for the front? Just get the 275/35-18s for the rear.

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    Senior Member 98maro's Avatar
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    Quote Originally Posted by 01NavyBlueSLPSS View Post
    Interesting. Looks like I'm gonna fork out the dough for 275/35 rears 275/40 in front. Went and got a quote. 950 bucks with labor. Ouch
    wow thays alot,,, but my job i got quoted almost $1800 for all tires.

    275/40.17
    295/35/18//

    and thats the best sizes you can run on those rims..i got the same rims//c5 zo6

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    Senior Member tatertot91's Avatar
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    Check tire rack and discount tire, they usually gave good prices
    950 is a bit high
    And I would go with at least a 295 in the rear for a 10.5" rim

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    Smiles for 9.5 Years cammed goat's Avatar
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    17x9.5 wheels with 245s...that is insane. That's just asking for carnage.

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    Rice killa 01NavyBlueSLPSS's Avatar
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    Quote Originally Posted by tremiles View Post
    Don't you already have a pair of 275/40-17 Nittos for the front? Just get the 275/35-18s for the rear.

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    Yes I do but they already have 50% tread wear.....so I figure if I buy new rear tires I should get matching fronts

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