Originally Posted by
rpenmanparker
Gerry, why does the 10 X 1 setup need a chain keeper. There is none on a 10 X 2 setup and the FD doesn't touch the chain except when front shifting. Why can't the chain just sit there all alone? Doesn't the RD manage the chain sufficiently?
Robert
I'm not Gerry but my 1x9 started out with no guard, and would drop the chain off the front. It wasn't common, but if I was rapidly accelerating and banging down through multiple cogs, the chain would fall off the outside. This was with an unramped unpinned Surly chain ring. I ended up having to put a bash guard to the outside.
It never once dropped a chain to the inside, or fell when shifting to larger cogs. Only on fast shifts to smaller cogs, 3 or four in succession, and much worse in wet weather. I can't explain it.