June 9, 20178 yr If your chain is skipping cogs on the cassette, usually in the highest gear, then don't always assume that a worn chain and cassette is the issue. I usually find that when my chain starts skipping on the 11T cog, it's a dirt build up between the 11T and next cog that causes the issue. Compacted dirt sits in the space between cogs and causes the chain to ride up off the cog under power. I use the serrated edge on one of these cheap tools to remove the crud. Best done with the rear wheel elevated, where you can spin it with the tool in between the cogs. Kamasa Cycle Bike Motorbike Sprocket Cog Cassette Chain Claw Cleaner Brush
June 9, 20178 yr Interesting - my Greenway has just started skipping in the top couple of gears (@450 miles). It feels like a stiff link in the chain, but I will check for compacted dirt as well as I used it in some hideous weather last week and haven't given it a "proper" clean since.
June 9, 20178 yr Author Just an update to my post #1. Where I mention that it's best done with the rear wheel elevated, of course all you lucky peeps with hub motors, can just rotate the pedals backwards to spin the cassette. Us BBSxx owners on the other hand
June 10, 20178 yr Last time my chain started skipping on the 11T gear I lubed the chain with Muc Off C3 Ceramic lube and managed another 600 miles+ before it started skipping again and I could even push hard on the pedals while on full throttle and no skipping! I wont use anything else now. Aldi sell it when they have cycling stuff for sale. Edited June 10, 20178 yr by Kinninvie
June 10, 20178 yr Author Last time my chain started skipping on the 11T gear I lubed the chain with Muc Off C3 Ceramic lube and managed another 600 miles+ before it started skipping again and I could even push hard on the pedals while on full throttle and no skipping! I wont use anything else now. Aldi sell it when they have cycling stuff for sale. I agree Kinninvie, although I personally use Finish Line dry teflon lube. I think the days of using a few drops of 3 in 1 oil are over, and modern drivetrains require these better lubricants.
July 22, 20178 yr When I last rode a bike the maximum rear cassette size was 6 sprockets - they were just going to 7. My new Haibike has 11 cogs! I reckon even a slight crud build-up will cause a problem. (Note to self: must put an old lolly stick in my seatbag!)
July 22, 20178 yr My problem is that even a brand new 11 tooth cog and chain skips. I have tried everything to stop it. I am now seriously wondering whether it is the cog itself slipping on the splines.
July 22, 20178 yr My problem is that even a brand new 11 tooth cog and chain skips. I have tried everything to stop it. I am now seriously wondering whether it is the cog itself slipping on the splines. Have you checked the 'B' dimension? Distance between upper derailleur pulley and cluster should be 6mm approx I believe. You can't measure with chain in place so use dead reckoning Set your chain as short as possible too.
July 22, 20178 yr Have you checked the 'B' dimension? Distance between upper derailleur pulley and cluster should be 6mm approx I believe. You can't measure with chain in place so use dead reckoning Set your chain as short as possible too. I have tried every thing. New cogs (twice) New chain (twice, New derailleur, new wire. Nothing works.
July 22, 20178 yr Author I have tried every thing. New cogs (twice) New chain (twice, New derailleur, new wire. Nothing works. How about changing the cassette to one with a 12T top gear. Doesn't sound like much of a difference, but the chain might grip a few more teeth on the cog. Don't know how many speeds yours is, but I actually managed to source an 8 speed cassette with a 13T top gear. Think they are a bit scarce nowadays though.
July 23, 20178 yr How about changing the cassette to one with a 12T top gear. Doesn't sound like much of a difference, but the chain might grip a few more teeth on the cog. Don't know how many speeds yours is, but I actually managed to source an 8 speed cassette with a 13T top gear. Think they are a bit scarce nowadays though. That is what I do. The 7th gear is 12 teeth and I just ignore gear 8. Works just fine.
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