Neil Fachie and Matt Rotherham are world champions on this (6)

I believe the answer is:

tandem

(Other definitions for tandem that I've seen before include "Bicycle for two (plus)" , "Bicycle-built-for-two" , "Two-person bike" , "Bike with two saddles" , "Bicycle built for two" .)

I've seen this clue in The Times.

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