[Guest]

Hi guyz...

I've asked this question once before on another forum but didn't really get an answer I was looking for...

My MR2 originally had stock 14" wheels, now it's got 17" up front and 18" under the rear, I have a feeling this has to have an effect on your speedometer, question is, what effect would it have, and would it have to be recalibrated?

Greetz
*ZR*

 

[Silver Supra]

Depends on the diameter (circumference) of the tire, not the wheel.
If the tire circumference changes, the speedometer calibration will be off since it is measuring rotation, not distance traveled.

And this should be in Tech.

 

[Ray745]

And this should be in Tech.

isnt this the tech section?

 

[Flavio]

What size tires did the car have originally and what size are you running now? Then you can calculate the difference.

Since most stock speedos are too optimistic usually with a slightly bigger tire they become more accurate and there is no need to recalibrate the speedo.

Flavio

 

[yasir]

Plus sizing your wheels and tires is the best way to improve both the performance and appearance of your vehicle. By using a larger diameter wheel with a lower profile tire it's possible to properly maintain the overall diameter of the tire, keeping odometer and speedometer changes negligible. By using a tire with a shorter sidewall, you gain quickness in steering response and better lateral stability. The visual appeal is obvious, most wheels look better than the sidewall of the tire, so the more wheel and less sidewall there is, the better it looks.
The key is to keep the "over all" diameter of the wheel & the tire as close to stock as possible.
Later, Yasir

 

[Guest]

Hey

Thx for all the good info guyz, I appreciate it!

Hey Flavio, nice to see we've got an awesome supra riding our Dutch little roads!

 

[Silver Supra]

isnt this the tech section?

yeah, after I moved the post.............

 

[supra_10]

"...the more wheel and less sidewall there is, the better it looks."

And the less sidewall the stiffer the ride... and it's perfectly OK as long as one is aware and willing to "relay" to his/her behind & back all the road imperfections... especially when it's a daily driver...
Jay