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Joined: Aug 2004
Posts: 992
Jace
2000 Toyota Celica GT
Jace
2000 Toyota Celica GT
Joined: Aug 2004
Posts: 992
just wondering if 18" wheels mess up the spedo or odo. anybody know?

Joined: Dec 2003
Posts: 84
Member
2000 Toyota Celica GT
Member
2000 Toyota Celica GT
Joined: Dec 2003
Posts: 84
It depends on the size your tires. http://www.miata.net/garage/tirecalc.html lets you figure out what the change is. But I did the work for you. The stock 195/60/R15 makes 833 revs/mi, and the 215/35/R18 makes 843 revs/mi. So your new wheels are smaller in overall circumference. The difference is 1.2% and that means when your speedo reads 60 you'll be going 59.3mph.

Joined: Nov 2003
Posts: 2,223
oas
Specialist
Specialist
Joined: Nov 2003
Posts: 2,223
good question never thinked of that spineyes thumbsdown

Joined: Jan 2004
Posts: 1,227
Likes: 1
Specialist
2002 Toyota Celica
Specialist
2002 Toyota Celica
Joined: Jan 2004
Posts: 1,227
Likes: 1
if you recalibrate the spedo does it fix that? I've always wondered

Joined: Feb 2003
Posts: 1,408
Specialist
2000 Toyota Celica GT
Specialist
2000 Toyota Celica GT
Joined: Feb 2003
Posts: 1,408
it will mess up both... just go to toyota and see if one of the techs is nice and will A) let your reprog you ecu for bigger wheels/tires, B) do it for you, with out causing much trouble. or you can take it to say walmart or pep boys, and see if they can do it, its not hard and it should cost alot, so they might be nice and if you buy some shit at the store do it for you for free

Joined: Aug 2004
Posts: 992
Jace
2000 Toyota Celica GT
Jace
2000 Toyota Celica GT
Joined: Aug 2004
Posts: 992
thanks for the help. wave

Joined: Oct 2003
Posts: 1,226
Specialist
Specialist
Joined: Oct 2003
Posts: 1,226
Isn't the calibration for tire size listed at this site? No need to recalibrate anything. Your going 18" don't worry about a MPH or 2 off below 100. If you need to worry about that on 18's don't race or be wary of the long arm of the law and follow the speed limit. They allow for at least a margin of 5MPH give or take or more depending on the cop. Don't waste your time with calibrations on your speedometer. Don't mess with your ECU!!!! Especially at Toyota. You'll be fine. Just slower for obvious reason, but fine. Don't worry.

Joined: Oct 2003
Posts: 1,226
Specialist
Specialist
Joined: Oct 2003
Posts: 1,226
Toyota or any body won't recalibrate you ECU, PERIOD. Toyota won't change your speedo for tire size either or can, PERIOD. You'll be fine on the 18" unless you got a tire size in an aspect of 60 on 18's. Read OneShotUno reply again or try it out yourself. Don't waste your time or money going to Toyota or somewhere else to fix a MPH difference. They will take your money and won't fix anything.

Joined: Sep 2003
Posts: 189
Member
2002 Toyota Celica
Member
2002 Toyota Celica
Joined: Sep 2003
Posts: 189
Just use the tire calculator to match your stock size..
With 18's you can go with 215/35/18 tire.. it's pretty close to stock size...(little under stock)
Also you have go with 225/35/18 that's little over stock..

You do not want to go size too small nor big... cause it'll unbalance the power transfer compare to engine and rotation mass and gear ratio.. etc... what ever it's designed for... sorry.. can't think of right names...

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