What is the standard tire diameter for 2008 altima coupe 3.5SE?

[Khaled]

I guess there is an error in my speedometer due to my tires size, that's why I need to know the standard tire diameter, to calculate the speedometer error %

Khaled.

[Plastics]

26.3 inches

[Khaled]

My tires are 215/55R17 which is almost equal to the standard tire diameter for the A/C!What is the source of error in my speedometer then?

[kuhan]

My tires are 215/55R17 which is almost equal to the standard tire diameter for the A/C!What is the source of error in my speedometer then?

use this tire calculator to find out

http://www.discounttire.com/dtcs/infoTireMath.dos

[Khaled]

There is about 10% error (more than actual speed) in my speedometer reading. Is this normal?I've checked my tier and it got the same standard diameter for the A/C! Why do I have this error?

Is it possible to reduce it? should I take my A/C to the dealership in order to fix this error?

Khaled.
Modified by Khaled at 10:32 AM 1/18/2009

[mikegtr06]

yep. if the tire size is not the problem call the stealership and they will prolly tell you to bring it in.....

[Khaled]

yeah I guess it's not a tire issue because I did not change them, they are still stock.

[dangeris]

How do you guys know that your speedo is off? Are you using a GPS to see your actual speed?

[Khaled]

For me:

1. I passed a speed camera and I was exceeding the speed limit (according to my speedometer reading) by about 10kmp. the camera did not flash. Happened with me many times!

2. I fixed my A/C speed with my friend's IS300 speed (both 160kph). He was going faster than me

3. Finally, I tired my GPS and the actual speed of the GPS was lower by about 10% from the speedometer reading