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Old 12-17-10, 11:04 AM
  #10  
fietsbob
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You are assuming all are running on the same bearing surface,
usually a plain bushing,
or a metal bushing and the inside of the plastic pulley itself..

Aftermarket Pulleys use a cartridge sealed bearing. in which case smooth
is independent of size
as the race bike RD use an 11t with a ceramic bearing, if you pay for that ..
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