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They will fit, but... (archive)
[ Follow Ups ] [ 3-series (E46) Message Board ] [ Msg. Board FAQ ]
Posted by Kaz325iT on September 02, 2001 at 21:40:42:

In Reply to: 235/45's on 17x8 Rims posted by Nook325I on September 02, 2001 at 21:06:59:

...you won't gain any sort of benefit from going to that size.

It won't look noticeably different, give you any better handling, or anything else. If you can get a set of 235/45s a lot cheaper than 225/45s, then that's a reasonable excuse.

The person who said 235/40s are a better match is WRONG. 235/45 is 0.35in taller in diameter than stock, but 235/40 is 0.57in shorter. See http://www.miata.net/garage/tirecalc.html for yourself. It will also show % the speedo will be off.

FWIW, I'm running 235/40/18 all the way around, which is larger than even 235/45/17s, and have no problems.

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