Campenaerts trains currently on the track in Mexico with a 61 x 14 gear. That seems to be the gear that he also Tuesday will use his werelduurrecordpoging. But if he feels that it is heavier, he can still go back to the slightly smaller 60 x 14.
With the 61 x 14 operates Campenaerts three tines higher than the current record holder bradley Wiggins in 2015. This will he the lower cadence (102) opposite to that of Wiggins then (104) may try to compensate.