Twice, in different tris, when transition from downhill through a slow turn, I jammed front derailleur to the small ring, began pedalling only to find that my chain on th bottom bracket. YIKES! (It happened once 2-3 months ago in training, too)
QUESTIONS
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Is it my too rapid shift?
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Is it my dereilleur adjustment? (looks OK)
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If it is 1 and not 2, does someone make something to keep that from happening? Seems that a small plastic guide on the seat tube could prevent that. (of course I have a beam bike–that might make this moot.)
A few things might help.
Recheck your front derailleur adjustment. You should have no more than about 1mm clearance to the inner cage when in the small front / large rear combination. Make sure the front derailleur cage is parallel to the chainrings.
If your bike has short chainstays, then you are going to be more prone to this type of problem. A large difference between chainrings can also contribute.
Avoid shifting to the small chainring when you are on the largest 2 rear cogs, the chain is most likely to come off then. Plan your shifts ahead of time.
If you can fit it, try the little plastic guide. Its called the third eye, and requires that you have a round section of seat tube next to the small chainring.
Thanks for the help. .
I’m going to sheck that gap again.
My Chainrings are the common 53/39. My stays are pretty short.
I was in the 12 rear. (It made my getting everything back in place a pain.)
I think I still might want to try to figure out how to mount the ‘third eye’ on my softride. (Running out of steam, because the corner is tight and slow with a transition to steep uphill, while trying to get the chain to jump back up is tough for me.)