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Alternate Drivetrains
I was just thinking about drivetrain ideas and was wondering why
ratcheting cranks are not seen in use. Yes it would cost you some weight and reliability and you would give up the ability to easily jump the bike but I am almost sure it would improve power delivery. I can think of two schemes, one employing a simple independant ratchet on each crank, and the second having a further embellishment so that each pedal would be independently disengaged during the least effective portion of the rotation (perhaps eight O'Clock to twelve O'Clock ?) so that it could immediately and effortlessly be moved to the top of the powerstroke. This has all no doubt been prototyped, tried, and abandoned back in the 60's or 70's, but what were the results? Thanks... Dave --- http://groups.yahoo.com/group/CheapMTB/ |
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Dave wrote:
I was just thinking about drivetrain ideas and was wondering why ratcheting cranks are not seen in use. Yes it would cost you some weight and reliability and you would give up the ability to easily jump the bike but I am almost sure it would improve power delivery. I can think of two schemes, one employing a simple independant ratchet on each crank, and the second having a further embellishment so that each pedal would be independently disengaged during the least effective portion of the rotation (perhaps eight O'Clock to twelve O'Clock ?) so that it could immediately and effortlessly be moved to the top of the powerstroke. This has all no doubt been prototyped, tried, and abandoned back in the 60's or 70's, but what were the results? Thanks... 6 months in the workshop and a short spin round the block is usually enough --- Marten |
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Dave wrote:
I was just thinking about drivetrain ideas and was wondering why ratcheting cranks are not seen in use. Yes it would cost you some weight and reliability and you would give up the ability to easily jump the bike but I am almost sure it would improve power delivery. I can think of two schemes, one employing a simple independant ratchet on each crank, and the second having a further embellishment so that each pedal would be independently disengaged during the least effective portion of the rotation (perhaps eight O'Clock to twelve O'Clock ?) so that it could immediately and effortlessly be moved to the top of the powerstroke. This has all no doubt been prototyped, tried, and abandoned back in the 60's or 70's, but what were the results? Thanks... 6 months in the workshop and a short spin round the block is usually enough --- Marten |
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In article ,
Dave wrote: I was just thinking about drivetrain ideas and was wondering why ratcheting cranks are not seen in use. Bikes like this exist. I have seen some (in museums) that were built in the early 1900s. I assume they didn't catch on because they were less efficient over long rides. |
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In article ,
Dave wrote: I was just thinking about drivetrain ideas and was wondering why ratcheting cranks are not seen in use. Bikes like this exist. I have seen some (in museums) that were built in the early 1900s. I assume they didn't catch on because they were less efficient over long rides. |
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#9
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Dave Wrote: I was just thinking about drivetrain ideas and was wondering why ratcheting cranks are not seen in use. Yes it would cost you some weight and reliability and you would give up the ability to easily jump the bike but I am almost sure it would improve power delivery. I can think of two schemes, one employing a simple independant ratchet on each crank, and the second having a further embellishment so that each pedal would be independently disengaged during the least effective portion of the rotation (perhaps eight O'Clock to twelve O'Clock ?) so that it could immediately and effortlessly be moved to the top of the powerstroke. This has all no doubt been prototyped, tried, and abandoned back in the 60's or 70's, but what were the results? Thanks... Dave http://groups.yahoo.com/group/CheapMTB/ something like this exists for some kinds of wheelchairs. -- fixit |
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Rotor cranks, Powercranks, Powerpedals...still trying to re-invent the bicycle.
looked at one of the Wright Bros bicycles from the late 1890s...gee, it sure looked similar to today. Double triangle frameset, HS, hubs, BB, crank, nice hubs with the rear being a single speed with an interbal brake, from 1895 or so. Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302 (303)440-3535 http://www.vecchios.com "Ruote convenzionali costruite eccezionalmente bene" |
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