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

Useful little thing this, I came across it a few years back. Seeing 'leonr's' post reminded me of it.

Thought maybe it could be of use to people?

Cheers,
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Good little link that *tumbs up*

just found out my speedo will be out by 2mph....

cheers fella!!

great link

No problems fellas, praps a sticky?

Change the sub-title to "Is your speedo out?"

I feel a moderation coming on!

Cheers,
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i've known about this for along time, didn't think it'd be useful to anyone.

although, i did choose between 195 and 205 tyres for my car using this.....

silly me! lol
well done!