[FED 387]

YES YES- the wheel is supposed to fit snug on the spigot--- this eliminates the wheel being off center ever so slightly on the axle---if it is off center you will end up with vibrations if you only use the axle studs to do the job --the faster the wheel turns the more the vibrations will increase- you will not be able to balance the wheel ON THE axle--- you should be able to balance the wheel OFF the axle on a machine---you are going to need to buy or make bushings to fit into that space to correct the problem --- I would call Summit and have them register another set of rims perhaps the wheel manufacturer machine them wrong --Good luck FED 387