It looks fine but the chain skips over it.
I have tried everything, new cog, new chain, new derailleur.
I have given up.
Crank drive pedelecs: chain wear and maintenance
- Thread starter Tomtomato
- Start date
I have tried everything, new cog, new chain, new derailleur.
I have given up.
I've never suffered any wear issues from the 11t sprocket and don't see it as being too small for my use. My drive train also runs as smoothly as a crank drive is ever going to. A definite clonk between each change. Are you sure that you rear mech hanger hasn't been bent at some stage?
All of my wear issues are with the 36t and 32t, and motor sprocket 15t. Wear is just subject to chosen riding environment. Your riding is presumably road biased, and mine off road.
All of my wear issues are with the 36t and 32t, and motor sprocket 15t. Wear is just subject to chosen riding environment. Your riding is presumably road biased, and mine off road.
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Try unscrewing the 'b' tension screw of the rear derailleur right off, but not so much that the top jockey wheel bumps into the lowest gear.
I feel for you Mike. Would you mind reminding us what bike/motor you're riding please.
Have you changed to new cog&new chain at the same time?
Could a new chain on old cog may slip likewise a old chain on new cog may slip ?
The bike is a Tonaro Enduro.
It has a new set of cogs, new chain and new derailleur, all properly set up.
From what I have read, the 11 tooth sprocket is a downhill sprocket, not meant to take the tension of 250watts on the flat.
Remember, the best engagement is only about 5 teeth.
It has a new set of cogs, new chain and new derailleur, all properly set up.
From what I have read, the 11 tooth sprocket is a downhill sprocket, not meant to take the tension of 250watts on the flat.
Remember, the best engagement is only about 5 teeth.
D
Deleted member 4366
Guest
I've run a crank motor at 30 amps onto a 11T top gear. It never slipped. In fact it made so much torque that it snapped the (T motor output sprocket in two when I tried to start in top gear. I put one on the Woosh CD too and that didn't slip. I've never heard of one slipping before, except when not adjusted properly or when using the wrong chain (too wide).
Well, I have been working at this for nearly 4 years now
4 sets of cogs
4 chains
2 derailleur wires,
One new changer.
I have tried all combinations of H, L and B.
Differing chain lengths
4 sets of cogs
4 chains
2 derailleur wires,
One new changer.
I have tried all combinations of H, L and B.
Differing chain lengths
Like d8veh, I'm running a massive amount of torque from a BBS02 through an 11T, and it hasn't slipped once either. On occasions I'm adding some serious leg power to the mix too.
Don't give up, I'm sure you'll find a solution
Edit: You must have posted at the same time... Maybe it's time to give up
Just throwing out a very curved ball, is it possible the wheel is out of line, or that the dropout is twisted.
Or even that you might unknowingly be mixing SRAM and Shimano parts.
Or even that you might unknowingly be mixing SRAM and Shimano parts.
D
Deleted member 4366
Guest
Now that I think about it, I did have slipping one time. When I built a bike, I didn't have a chain, so I nicked one off another bike (mine of course), and I had exactly that problem. All the gears worked except top, which kept slipping.
The problem was that the chain was too wide.The top two gears are very close in diameter, so the chain is held up in top gear by the one next to it. You don't get that on any of the others because of the bigger difference in diameter.
The problem was that the chain was too wide.The top two gears are very close in diameter, so the chain is held up in top gear by the one next to it. You don't get that on any of the others because of the bigger difference in diameter.
d8veh,
Seeing so many are having success with the 11t sprocket, I will look at getting a narrower chain, don't yet know if it will fit all the sprockets and ring gear yet. The present chain is an 8 speed chain.
I suppose it is possible that gear 7 is lifting the chain off gear 8
Many sprockets, particularly Shimano, have ridges stamped into the sides to assist with gear changing, the idea being that the ramps help to lift the chain as it's pressed inboard by the rear mechanism. If your chain has slightly excessive rivet projection on the inside, that can lift the chain as the projections catch on the adjacent sprocket's profiling ramps.
.
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