Old 06-16-10 | 08:58 AM
  #3  
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Sixty Fiver
Bicycle Repair Man !!!
 
Joined: Sep 2007
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From: YEG

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This is called high normal and most modern parallel derailleurs are set up this way although there are some low normal derailleurs that default to the lowest gear when there is no cable tension... modern ones are more complicated in their design.

Because of how derailleurs are designed and how they pivot and move it is simpler to build them with a high normal and simpler is better... the single sprung pivot design is efficient and elegant in it's simplicity.

My very old Peugeot touring bike has a derailleur that has no parallelogram but uses a coil spring and dual cables to move the pulleys and cage in and out and is a low normal as up shifting compresses the spring which defaults to low at no tension.

With this older design the low normal is natural and can be nice on a touring bike as a broken cable will not leave you stuck in high gear.

A few front derailleurs are also high normal and in the days of down tube shifters I thought this was the only sensible design as it put the left lever against and parallel to the down tube at speed and meant pushing it forward meant you were going faster...

When you park just set your bike in a gear yo can ride away on...
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