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tire rim sizing

 
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Old 29 Dec 2010, 01:48 am
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Default tire rim sizing

i am gonna run 17s on my pt but i have read that the tire size will make the speedometer read faster than what your going or slower. so whats a good tire size for 17s? and any suggestions on tires it self what brand.
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Old 29 Dec 2010, 04:36 am
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Default Re: tire rim sizing

...I'm just a blathering idiot...

Last edited by Chromenut; 01 Jan 2011 at 05:41 am.
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Old 29 Dec 2010, 09:08 am
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Default Re: tire rim sizing

I have 17"ers and 215/45R17 tires. They actually are exactly the same size as the original stock 16" tires, and show 2 to 3 miles too fast on the speedometer.

This means I'm actually driving slower than what my speedometer tells me.

I would suggest getting 215/50R17 tires on your rims (if they fit). These tires should give you the correct speed readings.
You could go upto 215/55R17, or get between 225/45R17 and 225/55R17, or get 205/50R17 to 205/55R17's.

If you have the same rims as I this would be the fitting tires. Don't know if your rims will have the same size though...

All of them would fit, and actually, most of the 55's above show the actual speed, meaning, on the original tires you'd be driving 40mph, any device measuring your speed like a GPS or cops with a speedometer will see you drive 37mph.
The 55's will show you exact speed, but you'll need to be careful not to go 42 or 43mph; where before you'd be driving 40, now you are actually driving 42 or 43. Not that cops will say anything,but if they have a bad day, they can give you a ticket for it!

In any case, when the thread wears off your tires decrease in size, and you could lose another 1mph in your benefit. I'd stick with 215/50R17's or greater.
215/45R17 are too hard to drive.

Last time I had a flat tire, and did not even notice it, because the tire itself has so little air in them!
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Old 29 Dec 2010, 01:49 pm
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Default Re: tire rim sizing

...I'm just a blathering idiot...

Last edited by Chromenut; 01 Jan 2011 at 05:41 am.
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