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When I’m in the smallest cog at the rear (11T) and I down-shift from my 36 to 24, my chain almost always fails to shift cleanly from the 36 to the 24. The chain will get caught between the chainrings and will get stuck in the frame if I keep pedalling (I have a Canyon Strive).
I’m not sure what’s the cause of this and how to fix it. Is it the chainrings/crankset (I have a Raceface respond crankset)? So replace it with a Shimano equivalent? Or is it the chainline? Should I add a 1mm spacer on the drive side so that the chain runs a little more parallel when in the smallest cogs?
small - small, like big - big on a triple is a combination you shouldnt really be using. Too much articulation on the chain.
Are you certain both chain rings are on the right way around? It is pretty unusual for a chain to get stuck between rings.
I realise that but the chain shouldn’t get stuck between the chainrings, should it? This never happens on my XC bike.
The 36T is definitely the right way round. I’ll need to check the 24T, I have to admit I remember being a bit confused as to which way round it should go when I fitted it. So it is possible the granny ring is not the correct way round.
However, I’ve had this problem since day one, I’d be surprised if Canyon/Raceface messed up with the chainring orientation.
Complete bike assembly is often not what it should be. I had a Genesis that had two crown races on the fork (one just sat loose on top of the other). Might be worth a check, although the shifting would be shite in the first place if the ring was on the wrong way as the shifting ramps would also be out of commission. Actually, thinking about it, that would only apply to the bigger ring. My money would be on the smaller ring being the wrong way around.
it shouldnt no. If this
is your crankset then there is a few things to check:
1. large chainring is on the inside of the spider not on the outside where the bash guard goes (might not be fitted)
2. small chainring spider is sitting flush and there is only 1 fitted.
3. small chainring is fitted flush to spider and right way round. But they are normally quite flat, unlike the other rings, so it's just small differences in teeth profile that matter in this case.
This is a different model but might be the same. There is a small lip on the small ring, like you get on some high end shimano with aluminium inners which could make the difference along with any chamfering on the teeth. also note the little tab on the inside of the rings that should be lined up with the crank arm (just in case you didn't know):
So this how my chainrings are setup up. Unless I’m mistaken they look correctly oriented to me?
[img] http://d.pr/i/eB09+ [/img]
[img] http://d.pr/i/1Nzv+ [/img]
What's the thin plastic ring?
Are there a set of spacers attached, how thick are they, will you get a better set up if removed?
Your front mech should need adjusting if you move the small ring.
I believe that is the chainring spider. It’s about 2mm thick. Without it I imagine downshifting would be virtually impossible since the chainrings would be too close to eachother.
But if that is a spacer you could swap for something less thick.
I had this issue on my road bike. The chain would often sit inbetween the two chainrings if shifting down. The problem was worn chainrings. If the teeth have worn down the chain won't be 'presented' to the smaller chainring at the right position or picked up correctly. Anyway, new chainrings and problem solved for me.
From your photo it looks like you might have a similar wear issue.