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Tire size Calculator

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I don't think so. Check out www.tyrestretch.com though fore an idea of where the tire will be in relation to the wheel (if your're thinking of a moderate to major stretch)

 

Yeah I've been there lots, I'm just wondering about overall diameter to try and keep the speedo accurate.

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That is very true, never thought of it like that. You're saying stretching the tire is in a sense decreasing the aspect ratio by bringing the tread of the tire closer to the wheel? Makes sense to me, still not 100% sure if that's true or how much it would effect the speedo. Best way to find out is to go through radar traps or use a GPS and compare speeds, then you can just do the <5MPH or whatever calculation in your head.

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