Great way to check Tire Diameter

[hammersley]

This is a great site to check tire diameter --



http://www.pepboys.com/tires/tirediameter.shtm.



My calculations show the following:



245 30. 46850394

265 31. 6496063

285 32. 83070866



As such speedo errors are induced by this amount and mileage should be adjusted accordingly.

 

[illflem]

The way I do it is to mark the bottom of the tire and a mark at the same place on the ground, roll the tire one revolution till the mark is on the ground again then measure the distance. If you need to get more accurate do five revs, measure and divide by five. This method will measure the exact diameter, many different tire manufactors sizes don't jive with the diameters, they all seem to be a little different.

 

[hammersley]

You're right

This is the best method to be precise, In fact when I get new tires I'm going to do this and when they're wore out - the same for kicks and giggles.

 

[Blakers]

Originally posted by illflem

The way I do it is to mark the bottom of the tire and a mark at the same place on the ground, roll the tire one revolution till the mark is on the ground again then measure the distance. If you need to get more accurate do five revs, measure and divide by five. This method will measure the exact diameter, many different tire manufactors sizes don't jive with the diameters, they all seem to be a little different.

This will measure the tire circumphranse... divide this by 3. 14159 to get the diameter.

 

[Stranger]

Check both sides!

To see how much stagger you have. Oo.



Do this before and after leaving the local "establishment" to see if you'll stagger home.



Life is not a journey to the grave with the intention of arriving

safely in one pretty and well preserved piece, but to skid in broadside,

thoroughly used up, worn out and defiantly shouting "Wow, what a ride!!!".

'96 3500 slammed (2/4drop) Piped, EGT and boost. Alloys X4.

Driftwood, complete DTT treatment.

A few other goodies. Stock? Maybe, well, ummm; no .

2002 35' Wilderness (35 5Y) 13K triple slide 5'er. Husky 24K hitch.

Fat and happy, draggin 10 tons of fun!

That's my story, and I'm stickin' to it. Officer

Life Member NRA, USAF Vet

 

[illflem]

Congrats Blakers, right after I posted I realized I left pi out of the equation. Figured what the heck, lets see if anyone notices.

 

[Joe Mc]

So once you figure the diameter then how do you figure out the difference in the odometer reading & figure your mileage out?



I'm asking cause I just put new skins on?

 

[willyslover]

Joe Mc... when you hear and see the red light / siren you'll know your head'in down the road tooo damnn fast