Workshop tales, trials and disasters.
Maintenance tips, techniques and myths.
Technical discussion, description and outright lies
6 posts • Page 1 of 1
I wanted to use an old 105 cassette for a single speed. Iv got two chains but when I set them up with chain tension they reach a point after about 1/2 a revolution where they lock up, the chain seems to be not sitting correctly on the 105 cs-5600 cassette.
I was wondering if this is because of the ratio of my rear and front cassette or because of the size of chain?
Chainrings are hardly ever concentric.
Cassettes are designed to change gears. If your chainline isn't straight then it might be trying to change gears for you.
Sheldon on Chainline
I presume the chains are a match for the cassette? (ie not a 1/8" chain on a 10spd cassette)
That's what im not sure about, i found this cassette on a wheel on the side of the road, the chains I have are from two 1980 bikes. Im waiting for some spacers in the mail so I cant adjust the chain-line only with the different gears of the 105 cassette currently.
I bought a 1/8" chain for a different bike, it looks different than the chains iv tried, I haven't measured anything but it looks like the chain is a tiny bit smaller than the 105 cassette and after 6-7 links it begins to raise out of the cassette's teeth
Mmmm, I wouldn't imagine that mismatched widths would be the issue.
Happy to be corrected here, but I think that every 105 sprocket ever made was half-inch pitch, so I doubt that there's any issue there.
Too-narrow sprockets + too-wide chains isn't generally a big deal. I've run 3/32" stuff with 1/8" chains without hassles.
I can't see how the sprocket could be too wide either; I don't expect 105 sprockets wider than 3/32" actually exist. I did once have a situation that was similar to what you describe. It turned out I was trying to use a 3/32" chain on 1/8" sprockets . Chains from 1980 would be 3/32", I would imagine, so that doesn't sound like the problem.
Worn sprocket + new chain, maybe? If you've got plenty of tension on the chain, that'd make the problem show up more readily. Anyway, assuming an okay chainline and compatible sprocket/chain/chainring I'd blame the following, in order of likeliness:
I agree with you regarding the pitch, I think 10mm was restricted to Dura-Ace . I also agree that 80's chains are likely to be 3/32", 9 speed didn't come around until the 90s and came with 5/64" chains.
Normally with single cogs a too wide chain is not an issue (do it myself), however my understanding of the situation is that hackattack is using the cassette as is and not separating the cogs. I was thinking that hackattack is using a 3/32" chain on a 9 (or 10) speed cassette and the extra width means that the chain is catching on the shifting ramps of the next bigger cog which is trying to shift gears for him. In that case he'd either have to get a matching chain, or do some cassette surgery to change the order of the cogs and spacers so that there are two spacers on either side of the cog that's in use to create extra space.
6 posts • Page 1 of 1
Who is online
Users browsing this forum: Mark Kelly