Choosing a tyre size for a given Rim width

[bizadfar]

Hey guys,
long time no post here as I've been mostly concentrating on my own street/track (dual purpose) car.

It's time for new rubber and I'm using 8" wide rims all round.
the standard was 225/45/17 (load rating: 91).
I went with 235/40/17 (load rating: 94) to lower the center of grabity without further distorting the suspension geometry. 235/40/17 is not common here and tyres can cost up to 3-4 times as much.

I'm considering going on 245/40/17 95 load rating.. but is there such thing as diminishing return?

Disregard fender/control arm clearance as well as increase in drag.

[flynfrog]

stock tire size on my car was 225 60s I believe I now have 245 45 on there the problem I have is the tires is pushing the limits of rim width. Its hard to get the tires to maintain its shape across its width.

[Super racing]

your best bet is to go thru all the options and info at tirerack.com

plus they have a good selection DOT approved comp tires and slicks

http://www.tirerack.com/tires/sizes/res ... iameter=17

I usually go as wide as I can(maintaining a good balance) and no lower profile than 40, but then again I get alot of free tires from my used tire connection, but I only use those for testing.

check the recommended tire widths for your rim width