We learned this trick fromStreet Level Cycles at Aquatic Park in Berkeley. Support your local community bike program!
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Signing UpStep 1Take an old chain and measure a loop.
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Great idea but how about this:
Replace the quick release on the seat with a tamper resistant bolt that way the only thing you need to change the height of the seat would be the tamper resistant wrench which is usually quite small and easily pocketed.
Example:
http://www.brycefastener.com/about.htm
Either way, your's is a nice solution but I wouldn't like the added weight and the annoyance of the chain bouncing around.