setup and tire circumference

[dsmithwc04]

I'm using the flag system and need to measure ride height and toe. I won't be using my old worn out tires as reference and won't have new tires until the race weekend at the end of June. What is the height of the FE Hoosier tire front/rear? How is the height changed via adding a single psi of air(need this for ride height).

[2BWise]

I suspect you'll be better off using worn tires and padding your measurements by 3-4mm than to try and measure an unmounted wheel/tire assembly. The loaded diameter will be different.

You can also use the worn tire to evaluate ride height changes per change in tire pressure. The relative change is all you're looking for.

Lastly, getting ride perfect is an unlikely proposition because once you get to corner weighting the car you will end up modifying the ride heights a bit.

[dsmithwc04]

I suspect you'll be better off using worn tires and padding your measurements by 3-4mm than to try and measure an unmounted wheel/tire assembly. The loaded diameter will be different.

You can also use the worn tire to evaluate ride height changes per change in tire pressure. The relative change is all you're looking for.

Lastly, getting ride perfect is an unlikely proposition because once you get to corner weighting the car you will end up modifying the ride heights a bit.

I was hoping somebody had a new set of stickers already mounted at any particular pressure. I could the use the data in relation to my measurements on my old tires. Changes in relation to my old tires don't require new tire data correct, but I want ride height to be very close to what I am setting up for but won't know until I'm at the track where my new tires are.

[SStadel]

Circumference is 67 front and 70 rear at 20 psi.

[dsmithwc04]

Circumference is 67 front and 70 rear at 20 psi.

thanks steve