Originally Posted by
Gallo
visible damage how broken tooth?
does the clunk sound align with where the joining link is when it goes clunk?
is the chain sized properly to the bike?
a tight joining link will cause what you describe.
Given it is 8 speed and new the bike is not on the high end but that does not mean it should not function properly nor that is a poor bike. Often assembly of bikes in general lack proper procedure. Chain Length is key to proper shifting and smooth operation. A sticky joining link or any link can cause jumps especially in a high gear. Often this can be fixed by working the stuck link once found by simply moving it back and forth and using lubricant.
Taking it to mechanic if this is beyond your skill would be wise. A stuck link can damage the cog and make the repair more difficult and costly
It's not very damaged, it just looks worn down and sharpened.
There didn't appear to be a stuck link but I lubricated the chain anyway.
When you ask if the chain is the right size are you asking if it's too long (ie I should take a link out) or if it's just an incompatible chain?
The clunking sound doesn't seem to line up with any particular place on the chain but it's hard to tell as I can't replicate it when the bike is sitting still. It only happens when I'm pedalling hard.
I haven't found a competent bicycle mechanic here. I took it back to where I bought it and the "mechanic" who assembled it had no idea what was wrong.