Originally Posted by WheelsBoutique
Telling by the 1.5 lb difference between the 20"x9.5" and 21"x9.5" it wouldn't be a stretch to imagine that a wider 19"x9.5" would be right on par with the P1 OEM fron wheel. Plus, you get the unlimited customization advantage of the HRE's.
Not sure how you come up with that.
Going by your wheels, the weight difference between 20x9.5 and 20x10.0 is 0.3lbs. Using that same differential, if the OEM wheel were 19x9.5 instead of its actual 19x9.0, it would weigh roughly 18.5 lbs - yes?
You say that your 20x9.5 weighs 20.5 lbs, and that your 21x9.5 weighs 22.0 lbs. Assuming that weight differential for 1" smaller diameter implies that, if you were to make a 19x9.5, it would weigh 19.0 lbs - a half-pound more than the hypothetical OEM wheel. An extra half-pound of rotating unsprung mass per corner is not nothing.
An unlimited customisation advantage probably does matter to some people - the people who buy cars for posing rather than for driving.
Apart from the problem of increased weight is the question of why anyone would want to
change the size of the wheels and tyres on his P1. If you think that your organisation is better at evaluating optimal tyre size than Chris Goodwin and his team are, perhaps I could interest you in a bridge that I might have for sale. It's a real bargain. After you paid me for it, you could customise it in any colour that you like.