Am after peoples experiences who are currently driving an MCS on 15" rims but originally started on 17" rims.
What kind of differences can one expect to notice with regards to the following:
- Handling, corning, ride comfort.
I am currently considering changing my 17" S Spokes for some 15x7 rims with some 205/55/15 tyres. The current list consists of
- Team Dynamics Pro Race 1.2
- Team Dynamics Pro Race 2
- OZ Ultra Legerra
This should reduce my wheel weight by almost 50%, which is quite a saving.
I've run 15, 16 and 17 inch rims. The 15s are for (non-RF) snow tires, so my experience is biased somewhat in that they lacked ultimate grip and were noiser. Offsetting that is the plusher ride and a slightly more lively feel (down likely to reduced weight and narrower 195-series rubber). 17s were on the dreaded S-spokes, and thus had a clunky, crashy, ponderous sensation; albeit one tempered by greater grip. They also look cartoonishly, freakishly large to me (though I'm old enough to remember when a Porsche 911 came standard with 15" wheels).
As others have said, 16" rims and rubber are probably the best compromise.
I use 15 x 6.5 inch wheels (Flik Blast) for autocross and track days. I don't know where the handling comments come from, but my data says much better handling with the 15 inch wheels. Mostly due to 10 lbs less of unsprung wheight at each corner.
Big wheels are all about bling, unless they facilitate big brakes.
I'm a bit confused by the suggestion of better acceleration, 15" with 205/55 is a larger o/a rolling radius than 17" with I assume std 205/40's therefore acceleration will be marginally impaired, I appreciate we are talking negligable amounts!.
We go back and forth between R12s with 175/65 R15 and R85s with 205/45 R17 RF summer tires. I don't recall the weight difference, but I've added it up in the past, and the rolling mass reduction is substantial. I notice no difference in acceleration and very little difference, if any, in ride comfort. The only positives in downsizing from my experience are lighter steering and reduced tramlining. They are outweighed by the reduced grip and less crisp handling on turn-in that accompany the skinnier tires. Keep your expectations modest. You're setting yourself up for disapointment if you anticipate the car being transformed.
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