Hi everyone. I was switching wheelsets over the weekend form 19/17 to 21/19 and couldn't take the front axel out from the Alpina wheel. Both Alpinas use original KTM hubs. Finally had to hammer it out with continuous lubrication around smaller spacer on the non ABS side. Looking at the parts taken out-observed that there was no corrosion, but the smaller spacer actually shrunk over the axle for some reason and left a mark. I couldn't put it back on the axle by hand at all, while all the surfaces seemed pretty smooth!!! The wider ABS side spacer had a noticeable free play in inner diameter compared to the axle outside dia. and it could completely freely slide back and forth as it should be....seems like a parts fault from KTM. Second original 21/19 wheelset had both small and big spacer of identical diameter, both could freely slide along the axle.....strange... when I moved to the rear wheel, same thing happened, had to hammer out the axle!!! Couldn't figure out what is wrong, but did remember that it didn't go in nicely in the first place, when I just bought the wheels from Alpina, hubs are original KTM. Stock wheels slide in and out freely....could it be that KTM on purpose supplied to Alpina original KTM hubs, but with incorrect parts dimentions-to make installation issues and that people would turn to buy the original KTM wheelsets instead???