When I used the Timber bell, I would find myself bouncing the forks up and down as I approached people if it were smooth ground!I get a lot of "Thank you for the bell" comments as I ride passed walkers on the trail with my Timber bell dinging. There's no way I could think about a manual bell on some the really bumpy twisty downhills.
But, I also have a manual bell for the smooth places where the Timber is silent.
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Sometimes easier just to pull the back brake for 2 secs and make a skid noise!