New Chain or whole new Drive Train?

[Martin PJ]

Here is another one that is worse. I wouldn't obsess about my cluster, just ride it until it gives you problems. If it slips with a new chain and it shows signs of wear, then change it.

 

But if it shows signs of wear and you are happy with it, then use it.

[Uni]

I posted a pic where the biggest cog on the chain ring has some flat parts. It looks like someone has hit it with a small hammer on the part where the chain pulls against the teeth. At some point the chain could slip over when you stand up or push hard.

 

If you put your chain on the small ring front and small ring back, wind it backwards and it should not have a hop every few revolutions, but wind back smoothly. Once it starts hopping (basically the chain tries to climb up on top of a cog) then it has stretched too much. The chain should be able to be run backwards on the smallest cog at the back without any jumping.

 

Ah ok. I don't think mine was hopping but not exactly smooth either, but when standing it has been slipping a bit. I always assume operator error has first point of call.

[Martin PJ]

Ah ok. I don't think mine was hopping but not exactly smooth either, but when standing it has been slipping a bit. I always assume operator error has first point of call.

 

I think if you do the wind back test on the smallest cog and it doesn't hop, then changing problems are probably somewhere else. I replace my rear gear cable often. As soon as I have a gear problem, I replace the cable (new sleeve and cable), this solves most things.