Wheel & Tyre Sizes

[me01mp]

Hi all,

I'm a little confused, on my 944 i've got Porsche Cup 1 wheels, 17" jobs..

On the rear i've got 255/40/17 's and on the front 215/50/17 's... I understood that the middle group was the wall depth.. so does this mean i'm running wheels with different circumferences?

Doesn't sound right.. or is this just how it is? Should i be looking for different profiles on the new set

Pagey

[lanan]

Your front tyre size appears to be wrong. Too tall.
I'm sure on my S2 fronts were 225/45/17 or you could have 205/50/17/
Have a look at this calculator to help you visualize the difference.
Your right the middle No. is a percentage of the tyre width to give the side wall height
Graham
www.miata.net/garage/tirecalc.html

[warmfuzzies]

No,

they are perfectly ok.

If you use the tyre size calculator you posted a link to that will say so too. There is nothing wrong with your tyre sizes, and I should know.










































They are mine too.

kevin

>> Edited by warmfuzzies on Monday 13th February 18:48

[lanan]

I beg to differ..!
Check again

[doctorpepper]

me01mp said:

Hi all, I'm a little confused, on my 944 i've got Porsche Cup 1 wheels, 17" jobs.. On the rear i've got 255/40/17 's and on the front 215/50/17 's... I understood that the middle group was the wall depth.. so does this mean i'm running wheels with different circumferences? Doesn't sound right.. or is this just how it is? Should i be looking for different profiles on the new set Pagey

Sounds like you have the 911 Cup wheels rather than the correct 968 cup wheels. Im guessing that your fronts are a 6J ?? if they are then yes the 215/50 sounds about right.

[lanan]

me01mp was concerned with the diameter diff.
If your not sure ask the Guys on the Tiatanic 944 site.
www.titanic.co.uk/FAQs/FAQ38_944Tyres.html