I have yet to see a spacer which is the "right" size as I think you are defining it?
If right is the actual spacing from the inside wheel flange to flange then you would be correct.
The spacer would be effectively not be present at 0.01" short - the same thing happens at any minus measurement.

But every spacer I have seen is "extra" long and by more than 0.02" so +/- 0.01" would not change the situation other than the amount the bearings are sunk into the hubs.

I stand by my 1st statement... Nobody would have to worry about backing off the bolt / nut to stop the wheel slowing down or making noise if the spacers were made correctly.

That's it.

Quote: Originally posted by AudereEng

I have yet to see a spacer which is the "right" size as I think you are defining it? If right is the actual spacing from the inside wheel flange to flange then you would be correct. The spacer would be effectively not be present at 0.01" short - the same thing happens at any minus measurement. But every spacer I have seen is "extra" long and by more than 0.02" so +/- 0.01" would not change the situation other than the amount the bearings are sunk into the hubs.