Evogreen
Member
They attach using a bracket that I designed. The bracket bolts on when you put your tire on. Then you can attach the clear cover and the aluminium retention plate with 5 bolts. To check your tire pressure and clean your rim you don't have to take off the bracket, just the plate and clear cover. I am currently working on the 19" slipstream wheel cover that will look the same as this. The bracket works on the 19" slipstream wheels. Not sure about the 5 spoke wheels yet, I have to get my hands on a spare 5 spoke that is not mounted to a car and test my bracket on it. It should be possible but may require slight modification to the bracket. I did testing with these on the 21" turbines and I saw 7% better energy efficiency at 110 km/h vs not having them on. So about 30 kilometers of range can be gained.