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Old 12-26-12, 11:22 AM
  #2  
fietsbob
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Because the engineers in the Company thought it was an advantage.

You probably need to get the definitive answer from them..

this is a FAQ, but as no one here is in the company.

Amongst the Guesses: Effectively wraps more chain,
and increases the radius of the pulley, so the chain does not bend as far to go around it.
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