Freescopesdad wrote:I am thinking of going this route but I haven't been able to determine what fitment issues I might have, especially from someone (anyone) with the same fitment. I sent GWR an email and also posted on the Miata forum with no result.
My ND is lowered to about 13.25 inches, FM alignment (1.8 camber F/R and 8.0 caster)... I'll use this new tire/wheel setup just for street and canyons, I have other wheels/tires for track.
I've seen responses that vary. You WILL have to roll your fenders, you WILL need to switch to 16x9 +45 wheels, you WILL have to have at least 2.0 degrees of camber, you WILL have to dial back your caster to 6.5 degrees or less... or you won't have any issues whatsoever because my 205/50/16s fit just fine on those wheels.
So is anyone running the Dekagram 16s and 225/45 tires?
Almost nobody running that size means almost nobody exists to answer, and too many variables including brand/model of tire, camber, rolled lips or not, etc. You sent us email and we did reply. Here is a cut and paste of my email back to you from Sept 9:
'We haven't tried the 225/45/16 size ourselves. On paper, that's 1" shorter in diameter than the 225/50/16, so it improves the situation, but most of the issue is width-related; a 225 on a 8" wide with +35 offset just gets real close to the fenders when the suspension compresses. Where do you stand on fender rolling? Already done it? Willing to? Against it? 205/50/15 on a 16x8 is an easy fit without the need for any fender roll, we've run that with no issues on our own cars.'
Bottom line remains the same today, you might need to roll some fender lip for that fitment, there is no more definitive answer available, it's too close to call without trying it and doing adjustment on fender lip as needed, and/or heights and camber as needed. I daily drive 225/50/16 on the 16x8 Dekagram, but with a lot more negative camber than you have listed here, and rolled fender lips.