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Forum: Folding Bikes

11-04-13, 05:43 PM

Replies: 19

Opinions on a retrofit design

Views: 1,387

Posted By seniordesign

I think I agree with you at this point, the...

I think I agree with you at this point, the coaster brake was honestly a secondary part of this idea I didn't realize it would be such a point of contention. Your concerns about the kickback are...

Forum: Folding Bikes

11-04-13, 02:38 PM

Replies: 19

Opinions on a retrofit design

Views: 1,387

Posted By seniordesign

Because you wouldn't buy a kickback hub that...

Because you wouldn't buy a kickback hub that implies that nobody needs or wants it? Thanks for your speculation but i'm looking for more constructive feedback.

Forum: Folding Bikes

11-03-13, 09:31 PM

Replies: 19

Opinions on a retrofit design

Views: 1,387

Posted By seniordesign

here's one anecdote:...

here's one anecdote: http://www.bikeforums.net/archive/index.php/t-721778.html

I appreciate you pointing this out though, I'm going to investigate using the model I'm using for testing.

Forum: Folding Bikes

11-03-13, 02:49 PM

Replies: 19

Opinions on a retrofit design

Views: 1,387

Posted By seniordesign

Are you saying that the chain tension will...

Are you saying that the chain tension will increase if I increase the jockey diameter to accommodate my design? I'm not sure yet if that is necessary, but if it is would the addition of a few extra...

Forum: Folding Bikes

11-03-13, 02:16 PM

Replies: 19

Opinions on a retrofit design

Views: 1,387

Posted By seniordesign

I don't see how this applies. Here is the...

I don't see how this applies. Here is the Brompton derailleur:
349066

The part outlined in red moves the jockey between the two speeds. I will be removing this and modifying parts of the black...

Forum: Folding Bikes

11-03-13, 01:13 PM

Replies: 19

Opinions on a retrofit design

Views: 1,387

Posted By seniordesign

This is not my intention. My design is basically...

This is not my intention. My design is basically a modification of the jockey axle that will result in a smooth gear change upon a predefined reverse rotation of the crankshaft by the user. The...

Forum: Folding Bikes

11-03-13, 12:06 PM

Replies: 19

Opinions on a retrofit design

Views: 1,387

Posted By seniordesign

Can you clean this up please? I have no idea what...

Can you clean this up please? I have no idea what you are saying.

Forum: Folding Bikes

11-02-13, 12:19 PM

Replies: 19

Opinions on a retrofit design

Views: 1,387

Posted By seniordesign

Opinions on a retrofit design

Hello, I'm a senior mechanical engineering student considering designing a retrofit kit for Brompton 2-speed folding bicycles that would allow the user to have kickback shifting ability. Shifting...

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