Old 03-23-13, 09:16 AM
  #4  
twocicle
Clipless in Coeur d'Alene
 
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Join Date: Mar 2012
Location: Coeur d'Alene, Idaho
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Bikes: Tandems: Calfee Dragonfly S&S, Ventana ECDM mtb; Singles: Specialized Tarmac SL4 S-Works, Specialized Stumpjumper Pro, etal.

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While we ponder another 27F "Spring" morning and the inevitable decision to ride trainer or hope for the ice puddles to melt and then do an outdoor ride...

As TandemGeek pointed out in "Timing Belt: Update #5", when loading up the front crank that resulted in the bottom run being under less tension than the top. However, it seems the test is flawed as far as tandems go because unless the ubiquitous "she's not pedaling" comes into play, the stoker will also be applying load and thus the bottom run will not be [as] slack. ie: does not the stoker load apply tension to the bottom run?

The other point about sprocket size brings up a question I've had for a while. While it's (more or less) well known that smaller timing sprockets incur higher loads and just require higher chain or belt tension, when the Santana configuration is using larger 74T sprockets, why do they not indicate less tension is required than with the more standard 69T sprockets?

Last edited by twocicle; 03-23-13 at 09:19 AM.
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