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Old 10-03-18, 07:51 PM
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Bikes: Trek 730, Bike Friday NWT, Brompton M6R*2, Trek 830, Trek 720, Dahon HAT060, Dahon HT060,...

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Originally Posted by Tamiya View Post

those bikes are single chainring?

ive seen some kiddy bikes with 1X7 Shimano, the single chain ring has plastic guard on both sides & the chain runs in the channel between them

im still not decided whether they're there to guard/guide the chain or more to protect the kiddy shin away from the sharp spikey chainring
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.
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