Bicycle Mechanics - mystery pin off cassett?
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07-14-10, 06:13 PM
What is this little Bolt pin? It fell off the cassette when I lifted it the hub, I assume it aligns the cogs, but the smaller 2 cogs dont have any holes...
07-14-10, 06:41 PM
if all the cogs are loose then yes it holds the cassette stack together. not necessary
What kind of cassette, brand and model, is it. I've never seen a pin like that on a cassette.
The cassettes are pinned together mainly for sales to OEMs. You might not mind a aligning and assembling 9 loose sprockets and a bunch of spacers onto a freehub,, but the bike factories certainly do. Pinning saves time and headaches in production, but doesn't matter functionally otherwise.
It's analogous to caged vs. loose balls in headsets and bottom brackets. Factories insist on balls in retainers because there's no way they'll fuss with loose balls, but most knowledgeable riders remove and discard the retainers with the first rebuild.
You should find an empty hole in your casette. There are usually three threaded pins or sometime rivets holding the cluster together. As reptilezs said they are not necessary. I've uncrewed the bolts or drilled out the rivets when mixiing and matching cogs when builidng a custom cassette.
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