Zt Sports

Spacer Issues

For all of you who are experiencing wheel binding when tightening onto the frame, I may have a possible reason for this.

I experienced this problem with a new set of bearings and spacers (BSB micro bearings). What I found out was that some of the spacers provided were not quite wide enough (½ mm too narrow). This caused the bearings to be squeezed axially to the frame when tightened, resulting in rotational binding. Some of you may be experiencing a similar
problem. In my case, a number of wheels had this problem.

So, if you are experiencing this problem and resetting/ fiddling with the bearings does not solve it, make sure the spacer is the correct width. Use a caliper gauge to accurately measure it.

For 608 bearings: bearing @ 7 mm, spacer should be 10 mm wide (2 x 7 + 10 = 24 mm) For 688 bearings: bearing @ 5 mm, spacer should be 14 mm wide (2 x 5 + 14 = 24 mm)

In my case: some of the BSB spacers were measured at 13.5 mm and caused binding in every position on the frame. 14 mm (measured) Twincam spacers worked properly.
This problem can also happen with standard 608 bearings.

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