Bicycle Mechanics - Problem installing cassette onto non-compact hyperglide hub
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06-26-10, 04:46 PM
I built up a new set of wheels using NOS Shimano DX hubs. When I tried to install the 11-28 tooth cassette onto the rear hub, I found that the cassette is loose and floppy on the hub because of the hub being non-compact. According to Sheldon, all I need to do is add a 1 mm spacer behind the cassette. I tried that and the rivet heads hit the spacer and hold the cassette out too far for the lockring to fit. Is there any reason that I shouldn't just grind the heads off the rivets? Maybe put a little Super glue on the rivet ends to hold them in place? Any other suggestions?
Is this a Shimano brand cassette? The rivets that hold the larger sprockets to the common spider on Shimano cassettes are well beyond the diameter of a cassette spacer, so I can't see why they'd create problems.
In any case if these are rivets holding sprockets together, don't grind them down since they'll lose their strength, and super glue won't make it up. Check that you have the right cassette for the body, and possibly for a smaller diameter spacer.
Also check that the lockring threads in completely by testing it on the freehub body without the cassette.
06-26-10, 06:32 PM
It is a Shimano Hyperglide-C cassette. The spacer lines up with just about the center of the rivet heads. The spacer that I'm using has an ID to OD wall thickness of about 2mm so I can't go smaller. If I could find something larger so that I could notch out around the rivet heads, that would be a solution. What about fabricating something like a plastic shim? The lock ring and high gear tighten down securely. It sounds like the whole problem is unique to using an 11 tooth cog on such an old hub where the splines reach clear to the end of the hub housing.
the only point of rivets or bolts holding together the cassette is to make installation easier.
06-27-10, 10:29 AM
Update: I ground the rivet heads off. The cassette rivets stayed in place holding everything together, didn't even bother gluing the ends. Cassette went on fine and locked in place without slop. Thanks AEO, and Sheldon.
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