[Vel0cityX]

What about weight? The Roadster is probably quite more more heavy than an F1, doesn't that play a big role in traction?

[Retric]

Not really, wider tires for example let you have constant pressure per surface area in contact with the road.

Now there are minor effects that do come into play, so 100x the weight would be meaningful. But, weight within the range of normal cars is not really important.