Quote:
Originally Posted by ard
Agree that AD is transformative.
20" rims will REDUCE performance. The constant drumbeat of low profile=performance is driven by industry dollars and then in turn market demand.
To the consternation of designers, they are being forced by marketing to put on lower profile tires - to the detriment of handling.
And remember, what numbers you get on a perfectly smoot skid pad will be only a component- you really want is real-life, street/road performance numbers. And not 'how if feels'
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In some aspects, 20s will not perform better than the 19s because of weight but not in terms of stopping feet and skidpad tests (below). Stopping feet is an every day driving occurrence and so is handling (skidpad more related to higher speeds).
Car and Driver:
X5 non-20s:
Braking, 70-0 mph: 169 ft
Roadholding, 200-ft-dia skidpad: 0.82-g
X5 20s:
Braking, 70-0 mph: 159 ft
Roadholding, 200-ft-dia skidpad:: 0.87-g