Post of all Rims and Tires out there!

[deermagnet]

H3, the only thing that will affect will be your speedo and odo. They both will be very slightly wrong. Not much at all. There are online tire calculators that will give you the exact percentage they'll be off by.

Mark

[H3_VX]

H3, the only thing that will affect will be your speedo and odo. They both will be very slightly wrong. Not much at all. There are online tire calculators that will give you the exact percentage they'll be off by.

Mark

Really? With only half an inch. I figured it wouldn't make any difference at all. Thanks.

[deermagnet]

Well I did say very slightly, not much at all. The 1/2" may be so small it doesn't matter. There has to be some difference.

Mark

[H3_VX]

Well I did say very slightly, not much at all. The 1/2" may be so small it doesn't matter. There has to be some difference.

Mark

I hear ya.

I'm thinking of picking up some NTG's @ 255/60/18. Good price and good looking tire. Also heard from many it has long life.

[Vendetta]

I hear ya.

I'm thinking of picking up some NTG's @ 255/60/18. Good price and good looking tire. Also heard from many it has long life.

Compared to the OEM 245/60/18s on your 2001, your new tires will yield a negligible 1.59% reduction in reported speed and distance traveled. You'll be going ever so slightly faster and farther than your speedo and odo tell you.

Probably within industry standards.

-V

[tom4bren]

Really? With only half an inch. I figured it wouldn't make any difference at all. Thanks.

Remember that the speedo is really just measuring the RPM of the tire & converting that to rate for distance traveled. Likewise, the ODO is just measuring the number of revolutions of the tire & converting it to distance traveled. It all boils down to the circumference of the tire which is directly proportional to the diameter (c=d*pi).

So ... the easiest way to wrap your mind around it is that the % increase you make tire diameter, your speedo & odo will be off by the same % (going from a 30" tire to a 33" tire will throw your guages off by 10%).

As a matter of fact, if you were to calibrate your speedo against a GPS with new tires, then again when the tires are used up, you should see a difference (small but measurable).