That's true of every Tamiya car that I have! There is only so much you can do, though. If you put shims between the pin and the wheel bearing, test the half shaft by hand to make sure it's not binding up. Also, check it again when the wheel is installed. If there is any binding, it will damage the bearing(s) so you may have to back off the wheel nut a tiny bit to eliminate the binding. If you're running bushings, you will just be slower than normal if there is binding.