SS variable chain tension
tricky – on most cransets you can adjust the chainring position so that any slight ovalness is taken account of and the tension is even.
Clearly an Uno isn’t going to allow that.
might be worth getting some callipers and measuring the ring to centre distance in various places plus the same with the cog?
not sure what you could adjust to compensate if it is out though.Posted 7 years agoir_banditoSubscriber
Most likely your chainring is eccentric on your cranks,
Sheldon Brown has a good method for balancing it out:
1. Position wheel and cranks so chain is at its most taut.
2. Loosen chainring bolts slightly.
3. Hit chain with a hammer, so it’ll go slack.
4. Spin cranks round and repeatedly hit the chain unitl its the same slack/tautness all the way round.
5. Tighten chainring bolts, tighten chain.
I did exaclty the same thing on my D-Jab last nightPosted 7 years ago69erMember
Strange one this. My fixed road bike set up has a tight spot. Don’t like it but it’s not a major issue.
My UNO/Royce bb/Surly MTB set up is amazingly free. No tight spots and minmal friction. Engineering loveliness.
I would suspect the parts in this order:
Chainring (you’re stuffed!)
Sprocket (try another?)
Cranks (you’re stuffed!)
Keep us posted!Posted 7 years agomattsccmMember
If you don’t sort it you could use old style CX chain guides either side of the sprocket. I find when mine gets loose and drops off it stays on the freewheel ok until the chain is right off. Its bouncing of the chain wheel. Chain gides do stop this to a great extent.Posted 7 years agoepicycloSubscriber
13thfloormonk – Member
…I’m hoping I can sort my chain dropping by replacing the SRAM chain
You’re not using a derailleur chain by any chance? Their strong selling point is that they are designed to drop off sprockets easily (rely on the derailleurs to keep them in place).Posted 7 years ago
Hmm… sorry for the resurrection, just been out today with my new 1/8th KMC chain, and it was perfect. Actually slackened off a bit over the ride, maybe just bedding in or maybe not as stretchproof as they claim, but either way, it didn’t drop once, and the SRAM PC-1 would have been off countless times the way I was riding today.
Obviously not conclusive in light of 69er’s ^ post, but I’ll be sticking to KMC from now on!Posted 6 years ago
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