AUCKLAND,NZ - JUNE 01 2014:Couple rids tandem bicycle.Compared to a conventional bicycle, a tandem has double the pedalling power and with only slightly more frictional loss in the drivetrain.

AUCKLAND,NZ - JUNE 01 2014:Couple rids tandem bicycle.Compared to a conventional bicycle, a tandem has double the pedalling power and with only slightly more frictional loss in the drivetrain. - 46256407

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