Quote:
Originally Posted by The B
Howdy
Searched and only found one other thread, but it seemed to devolve into a side topic that strayed ever farther from my issue.. so I figured I'd start fresh:
7900 with unknown mileage... probably about 5,000 miles. Completely problem-free, super low-maintenance until this issue.. but quite suddenly, the chain gets stuck between the big and small rings when I drop from the big to the small. Went from no problems to it happening pretty much every single time I shift rings... I have to make sure I'm easing up and be prepared to immediately backpedal so it'll un-stick itself and fully drop to the small ring. No issues going back up to big ring.
Rings and chain are cleaned and lubed every ride, thoroughly so every few rides. The chain does have about 2,000 miles of gritty PNW all-weather riding on it, but, as I said, I do clean and lube very regularly, and it still gages good with a Park gage.
My thoughts are: clean/lube/re-tension the front mech cable and re-set limits... but that's all I got.
Thoughts?
Thanks!
-B
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It's called "chain suck." The chain fails to disengage at the bottom of the chainring when shifting between rings and gets "sucked" up between the chainring and the seat stay. It's a common MTB issue. It generally means the rings are worn, and it is aggrevated by dirt and grit.
First, check your chain; make sure there are no stiff links. Not to start a debate, but change your chain at around 1,500 miles to prevent wear on the rings/cogset.
Then look at the rings, and if possible, compare them to new rings. My guess is that the teeth on your rings will have hollowed out on the side where they engage and will look like shark fins. If so, it's time to replace the rings. My experience with Shimano road rings is that they last a pretty long while, but newer rings with ramped teeth not quite as long. My MTB rings (at least the bottom two on my triple) have to be replaced every season.