Wheel rim width

[barks]

Hi All,

I have a set of Michelin Cup track tyres for my car, 225 17's front and 255 17's rear. There are various rim widths available that according to general consensus will accept the respective tyre widths. What I would like to know is if there is an optimum rim width and if so how to figure it out.

Cheers

Tom

[Locknut]

In the good old days of 155/13 tyres on almost everything, the recommendation was that the wheel should be 70% of the tyre width. I'm not sure if that still applies with today's wide, low-profile tyres.

[PaulKemp]

225/17 optimum 7.5" range 7-8.5"
255/17 optimum 9" range 8-10"

This will depend on aspect ratio and of course manufacturers recomendation
Handy charts in Demon Tweeks catalog

[nsa]

I had the same question a while ago. I run 225/45/16 Dunlop Direzza track tyres and 225/50/16 Falken 452 road tyres on a 7" Fuchs wheel. The 45 profile Dunlops look fine but the 50 Falkens bulge a little.

Lots of Porsche owners run 225s on 7" without problems, but the optimum rim size is 8". I wouldn't dick around with 7s if I could find a reasonably priced set of 8" Fuchs.

Agreed, the Demon Tweeks chart is very helpful. Find your tyres and they will give rim sizes.