Is Tire PSI Change Necessary?
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Thread: Is Tire PSI Change Necessary?

  1. #1
    Greenhorn
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    Lightbulb Is Tire PSI Change Necessary?

    Going from the stock 225/40R18 tire to a 235/45R17 tire. Will this require a change in how much air I should have in the tires? Should I keep it at the stock recommended psi?
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  3. #2
    Big Timer!!! homegrown's Avatar
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    I'm not certain if there's a hard and fast rule for this.
    Probably the best thing to do would be to set it at the same pressure as recommended from the factory on the door jamb sticker, and adjust as necessary according to the wear pattern on the tires.
    scottyrocks likes this.

  4. #3
    Greenhorn
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    Quote Originally Posted by homegrown View Post
    I'm not certain if there's a hard and fast rule for this.
    Probably the best thing to do would be to set it at the same pressure as recommended from the factory on the door jamb sticker, and adjust as necessary according to the wear pattern on the tires.
    Yea - that's what I've had in my mind to do but then figured if I'm changing tire size then perhaps pressure should change along with it. I've been trying to dig for answers but nothing concrete as come up yet.
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    Top Dawg!! bfaided1984's Avatar
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    I have been in the business of aftermarket wheels and tires for a long time. We always set them to factory specs. Even if we put something huge on like 37x13.50R22.
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  7. #5
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    Quote Originally Posted by bfaided1984 View Post
    I have been in the business of aftermarket wheels and tires for a long time. We always set them to factory specs. Even if we put something huge on like 37x13.50R22.
    That's exactly what I did. I'll keep an eye on the tire wear and adjust psi as needed.
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  8. #6
    Big Pimping!!! Squidward's Avatar
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    It depends on the tire you have and what you're doing with it. For most any normal application you can't go wrong with ~30 PSI.
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