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bicycle movement!

Question asked by anu_mech in #Coffee Room on Oct 8, 2009
anu_mech
anu_mech · Oct 8, 2009
Rank D2 - MASTER
if a bicycle moves forward on forward pedalling....then why it does not go backward on backward pedaling....is the backward movement blocked or what?...if yes then what is the mechanism? Posted in: #Coffee Room
antenna
antenna · Oct 11, 2009
Rank E1 - BEGINNER
There is a pawl - ratchet mechanism inside.
Plasma
Plasma · Oct 12, 2009
Rank E2 - BEGINNER
genuinely a bicycle is pedalled forward. If it was designed to go backward while 'backward pedalling' we would have a big loss because slight backward pedalling would incur a huge decelleration. Well, we can design gear that intakes both forward and backward input for the output in the same direction.
anu_mech
if a bicycle moves forward on forward pedalling....then why it does not go backward on backward pedaling....is the backward movement blocked or what?...if yes then what is the mechanism?
4d1
4d1 · Oct 12, 2009
Rank D2 - MASTER
[​IMG]

its ratchet-pawl mechanism
gohm
gohm · Oct 12, 2009
Rank A3 - PRO
Yep, as a kid I remember the bikes not having that feature (except ten speeds) and pedaling backwards were your brakes. You sure could do som serious power slides with those as compared to the lever brakes.
anu_mech
anu_mech · Oct 13, 2009
Rank D2 - MASTER
thanx all!
4d1
4d1 · Oct 13, 2009
Rank D2 - MASTER
gohm
Yep, as a kid I remember the bikes not having that feature (except ten speeds) and pedaling backwards were your brakes. You sure could do som serious power slides with those as compared to the lever brakes.
are those still available...and how much effective are they?
gohm
gohm · Oct 14, 2009
Rank A3 - PRO
I'm sure they still are. The braking that way was much more effective then the handlebar lever/wheel pad style. At least at that time anyways. My sisters had 10 speeds and I could easily out brake their bikes on my dirt bike even though you only had a rear brake. Power sliding was always a lot of fun. If I then jumped onto a 10 speed I would always initally try to brake by back pedaling before I realized I was just free spinning. laugh

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