Ride Height

[map7]

I'm downgrading from 17" with 245x40 tyres to 16" with 235x50, am I right in thinking my ride height will drop by 15mm. If so is there tyres I should put on so that it will not drop?

[r33_racer]

If i did the formula properly, i worked out that your 17's rolling diameter was 627.8mm and your 16's rolling diameter would be 641.4mm. The difference is 13.6mm, which means your height will increase by half the difference, so 6.8mm.

If someone wants to double check that, make sure i didnt fudge it up... Im fairly sure you work out your sidewall by finding its percentage of the tyre width and then add that twice to your rim diameter and that should equal your true rolling diameter:)

[scathing]

Nup. Its actually a drop of around 2mm.

Diameter = pi x radius squared

[Laurence]

If you want to play with sizes this page is helpful

http://www.miata.net/garage/tirecalcold.html

p.s. LOL at scathing... my highschool maths teacher is probably rolling in his grave at this moment

Edited May 8, 2006 by Laurence

[r33_racer]

isnt that for area of a circle...pi x radius squared.

based on that calculator thingy i didnt fudge it up...sweet. have to keep that site handy

[scathing]

Actually, right you are.

pi x diameter = circumference

My high school maths teacher is probably homicidal.