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#47972 Sep 24, 10:46pm
Joined: Aug 2003
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2000 Toyota Celica GT
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Hi all I have a question. I think I already know the answer but I would just like to make sure. I recently went from a 15 to a 16" rim. I know not that much of a difference but I got it for cheap. I want to know will this affect my spedometer reading or will it reconfigure itself to the correct speed. Please let me know whaty ou think. thumbsup thumbsup

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unless you changed the overall size of the wheel and tire a lot, it will only be off by a little bit (probably about 2-3mph). but i could be totally wrong, so someone back me up. also, you could search for a wheel speedo calculator thingy and it will tell you how far off it is.

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Yea that is kind of what I was thinking as well. I just didn't want to be a freaking retread whenever it came to this. Thanks for your reply though.

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dikitzaps
1974 Toyota Celica
dikitzaps
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it wont be off by anyhting...if your that worried about it you can get someone with a diagnostic plug in to set your wheel size.

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I'm not really worried about it I just thought that I might be off a little being a new size rim but thanks for the input though. thumbsup

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ev3
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hmm...wasnt aware of this problem actually...im probably gonna go for a bigger change...from 16s to 19s. How much of an issue will that be?

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ThE iRoN mAiDeN
2003 Toyota Celica GT
ThE iRoN mAiDeN
2003 Toyota Celica GT
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If your wheel and tire size (the combo) is larger or smaller than stock (24.1", I think) the your speed will read slower or faster than it should.

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If you stick with the stock tire size for the 16" rim (20/50/16) you will only be off by 0.4% from your stock 15".

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Originally Posted by ev3
hmm...wasnt aware of this problem actually...im probably gonna go for a bigger change...from 16s to 19s. How much of an issue will that be?

the speedo will only be off if the overall diameter of the wheel and tire is quite a bit bigger than stock. its really only a problem for things like hondas that have stock 15" wheels and then the ricer owner throws some bling bling 20s on. if you abosolutely have to know how far off it will make it be, sue the calculator on the link. it will set you straight thumbsup thumbsup

http://www.mr2.com/FORMS/tire.html

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Nice link silver. It states that i'm only off by like .9238479837% or some small number like that. But thanks for all the replies though.
Bartiks

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yeah that would mean that when the speedo says 60, you're really going like 61. you're fine... thumbsup

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2000 Toyota Celica GT
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Oh well like 1 more mile per hour is gonna hurt me. ECELICA.COM rules. Thanks for all of the posts guys. thumbsup thumbsup thumbsup goodjob goodjob

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Originally Posted by Bartiks
ECELICA.COM rules. thumbsup thumbsup thumbsup goodjob goodjob

it does indeed. cheers goodjob

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