The unsprung weight on the 20" cars is just crazy. Not only do they have enormous heavy wheels, but they also have steel uprights which weigh 13Kg each to compound the problem. Add big steel discs and the calipers (these do at least have an alloy piston housing) and you've got the weight of a Polo engine at each corner! Its hardly going to help the vehicle dynamics overcome a quarter ton of engine in front of the front axle.
I think you're right on why inboard discs never caught on. They take up valuable room which could be used for people and things, whereas the space in the wheel is otherwise free.
Last edited by MikkiJayne; 5th October 2017 at 09:48 PM.
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