I ditched the 2×9 drive train on my 29’er to go with a 1×9 set up (32t front & 12-36t rear). The front ring is a Raceface un-ramped one. The guide is an M-part one.
It’s be fine until the last ride out – it was freezing cold and the ground was solid to the point where ruts were solid lumps – the chain must’ve come off the front ring around 10 times in 2 hours.
The set up is as pictured below.
Does it look right for positioning over the ring?
It’s only happened in these freezing conditions, could it be down to the mech getting a bit cold and not keeping tension in the chain allowing it to unship from the ring?
It could be because its not a proper chain guide and you were riding on very rough ground. How many downhill riders do you see using one of those guides? None?
What’s wrong with that guide? No need for a full on DH guide for XC riding.
If it’s never been a problem before and then was that bad yesterday (assuming you’ve ridden it in anger before on similar terrain) then something’s awry, hard to tell from the pic, but it looks alright. How were you losing the chain? Over the front or back of the ring?
I’ve tried to get one of those guides set up on a 32t ring, but they foul on the chainring bolts, so don’t really cover enough of the chain & rin to be effective. Larger rings work better, as do other brands of chainguide.
Nope, the bash will keep it from falling off outboard and the jump stop will stop it dropping inboard. If you are still dropping the chain during xc riding with that set-up you’ve got chain tension issues. 😉
Yep, as a rough guide, then I took out another link IIRC so’s the cage was sitting at a nice 45 deg angle whilst on biggest sprocket and the tension was perfect.
Never dropped the chain with that set-up and gets my vote everytime. Your’s and others mileage may vary but a DH chain device will look gopping on a 29er HT imo 😀
Do you mean came off the ring and got snagged up in the guide?
Using a bashguard may help but a pauls chainkeeper is exactly the same as what you have just more expensive.
Otherwise a light DH chainguide. Top end dh guides will cost up to 10x as much, weigh almost three times as much but your chain won’t be going anywhere.
Freewheel not being free enough? Blooming things are very prone to this issue in freezing conditions. Make sure there is no free water in there. Replace any grease with oil.