The thing with pulling the chain away from the chain ring is about checking for a worn chain, although possibly the test could also tell you about worn chainring teeth. You don't do it like you're doing in that photo - the idea is to leave the chain wrapped around the chainring whilst trying to pull a few links of the chain away. If the chain is 'stretched' (i.e. its internal parts have worn down) then the extra length will allow the links to be pulled away from the teeth of the chainring - whereas normally they'd be held tightly in position around its circumference.Northeastperson wrote: ↑26 Nov 2021, 7:46pm Since I started this thread I heard from a former highly competitive road cyclist. He suggested I pull the chain forward away from the chainring as that could tell me something. What do you judge from the photo?
Have a look at this video from around 2 mins 20 seconds onwards to see this being done: