I believe Tamiya did this on purpose because Lee tested them out on carpet surfaces and found the prototypes to strip out, just like associated do once in a while. So they made the hex just a tiny bit smaller for a better, more snug fit.
The trick to fit them is to line them up and screw the nut on. The nut will force the wheel on to the hex and make a perfect fit. It will not fit by hand, you'll have to use this method. Tamiya never mentioned this when the wheels were released which is an error.
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