I have bought those caps for my TT, so just went and tried to fit them to my spare set of 16" 6 spoke A2 wheels and whilst they do seem the same size, they don't fit at all won't push on, there is too much plastic on the TT cap if you can look at a picture of the underneath of one there are small fins or buttress like mouldings coming out from the centre hole and there is no room in the A2 wheel for them to go.