275/40 R18's?
This chart should help just plug in sizes and it gives you the O.D. and the tire width
Tire Size Calculator - Tire Size Chart
Hope this helps
Tire Size Calculator - Tire Size Chart
Hope this helps
Well I can confirm they fit fine, no rubbing or untoward effects, so far 
They look right for the car and it feels to have far better grip, although its hard to tell if this is due to new rubber or the wider contact patch.

They look right for the car and it feels to have far better grip, although its hard to tell if this is due to new rubber or the wider contact patch.
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