In the picture shows double chain ring. It's from an older bike that's been put onto this bike. It's a full speed ahaid 50/34 11 speed. I think the outside ring has done about 15,000 km and the inside ring only a few 100. I spend 99.9% of my time in the large ring and a lot of my riding time is spent powering. I run a 3 chain rotation and proper clean at every 300km. The 3 chains are sort of new at about 1500km each chain so a total of 4500km on the current 3 chains and current cassette which also gets cleaned well and religiously at every 300km. Chains aren't even at 0.75% wear yet. I've noticed over the past couple of months, 1 of my chains will come off the large chain ring when I pedal with high torque. The last couple of weeks, another of the 3 chains has started doing the same thing.
All chains are at an equal level of use within at most 100km of each other.
The reason in posting here this question is because to me the large ring doesn't look too worn.
Can anyone tell me, no I'm wrong and its totally worn?
by Nedwobsamoht
1 Comment
I think it’s important to examine the chainring when it’s thoroughly cleaned and take a good look at each tooth. But from the pictures I’d say there is enough wear to throw a chain. The bigger issue may really be with the chains themselves though. Usually a chainring and chain “marry” themselves to one another and the wear sort of evenly distributes across both. By swapping chains out you may be prematurely grinding down your chainring.
The rollers on the chain that keeps dropping might just be more stretched out than the teeth on the chainring. A good test is to see how much play you have in the chain. With the chain installed pull the chain away from the chainring (at the farthest point on the ring) and see how large the gap is, if any. Do this with each one and compare.