I still don't understand myself...
For a start 15" look silly on classic cars - it seems to be all the rage to put them on muscle cars too... no no nooooooooo... muscle cars have big fat huge pieces of rubber on them... not skinny things...
I still don't know why you need _more_ grip than the standard sizes myself - it seems to me that the suspension isnt set up right in the first place - and fitting bigger tyres is a hack to try and fix that...
I still claim that my 145s give me serious grip with devine neutral handling... it goes around corners like a bat out of hell... or something that goes around corners very quickly... as tested on the Scottish not-much-wider-than-a-Spitfire roads back in October...
So, I conclude, to the people who want to fit 15"ers... if it's just for fashion... that's ok, just as long as you don't think you're getting a better ride of handling... to the people that know better... let's not try and argue - let them live in their Miata world...
(yes this email is written in a happy frame of mine :o) )
James
M D "Doc" Nugent wrote:
There won't be any change in a CAD drawing of the suspension's arcs, but the plus two wheels/tires WILL change the real-world geometry. Better grip between tire patch and road will compress the suspension bushings more, making their pivot points change, and slop from sidewall flex with "old style" tires will be gone, so the bushings and bearings can be expected to fail sooner. Small stuff, but real. For plus two wheels/tires to achieve their potential, you need non-flexing bushings (polygraphite, etc.) to keep the suspension pivots in one place.
As to performance, I'd bet you could find a 13" autocross tire that would outperform 15" low profile street tires. All you really get with plus two wheel/tire combos is a different look - not automatically better performance.
M D "Doc" Nugent Renton, WA
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