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Old 10-04-18, 09:29 AM
  #14  
linberl
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Join Date: Jun 2014
Location: SF Bay Area
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Bikes: 2017 Bike Friday PakiT. Dahon Mu Uno (trailer bike) Sold: 2003 Bike Friday NWT, 1997 Trek 720, 1993 Trek 520)

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Originally Posted by 2_i View Post
When you shift in the rear, a wave propagates on the chain up to the chainring that can cause a chain drop when the chainring is rotating. A front derailleur cage limits the lateral movement of the chain and so does a chainguard attached in a close vicinity of the chain. This is also the purpose of the chain guide on Bike Friday.
Friday's don't come with a chain guide (just a chain protector/bashguard). The sell one as an option or there is the problem-solver one I pictured above or, if you like spending money, Paul Components makes a lovely one. I dropped my chain once after I removed the protector and then I learned how to shift and it hasn't happened again =).
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