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lots or variation in tire width in the same size from manufacturer to manufaturer, For example:
OEM Michelin Primacy 215/45/17 Tread Width 7.5" Rim width 7"-8" 844 rev/mile
Hankook RS3 215/45/17 Tread Width 7.9" Rim width 7"-8" 843 rev/mile
Yokahoma AD08 215/45/17 Tread Width 8.0" Rim Width 7"-8" 847 rev/mile
Yokahoma AD08 225/45/17 Tread Width 8.5" Rim Width 7"-8.5" 836 rev/mile
Dunlop ZII StarSpec 225/45/17 Tread Width 8.2" Rim Width 7"=8.5" 837 rev/mile
I ended up going with 17x8 wheel (ssr type c, one of the lightest 17x8's you can get) and the 225/45 AD08. In 225 45 the AD08 has a full inch (25.4mm) of tread width over the oem 215/45 Michelin but is only slightly taller than stock. Combined with the much stickier compond this setup has WAY more grip than stock.
Also, notice the Hankook, in stock size, has a .4" advantage in tread width over stock but is the same height as stock.
It's going to come down to what you care more about.. with a soft compound and good design a 215 or 225 on an 8" rim is a really good fit and weight. You can go wider and run less aggressive tread compound but you will sacrifice weight to do so.
For my next set, i may do the 215/45 AD08 on my 17x8's simply to get the gearing advantage.. But, i will be giving up a 1/2" or tread width to do that....
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