Air Wheel insert.
 
Have you chosen a set of wheels, but dismayed to find they are only available as an 'Air Wheel'. Well these are the parts you need to address the issue. A simple set of four split inserts that simply clip into the wheel centre and fill in the gap.
 
I've been told how an 'Air Wheel' is meant to work, but in reality, every time I've used them, all I get is wear marks on the two outer parts of the tyre. Fitting these inserts flattens out the top of the tyre and gives 100% contact.
 
Kit contains :-
X4 inserts