A modular conveyor (1) comprising a conveyor mat or chain (2) constructed of a series of links (3) hingedly connected together into an endless loop arranged to be circulated around two spaced diverting wheel units (4, 5). Each link is positioned at a pitch distance from an adjacent link, which pitch distance is at least substantially the same throughout the conveyor mar or chain. At least one of the diverting wheel units (5) comprises a drive shaft (9), a drive wheel (10) mounted on the drive shaft and drivingly engaging the conveyor mat or chain and further an upper idler wheel (12) mounted on an idler wheel shaft. The upper idler wheel shaft is positioned above the drive wheel shaft, such that intermediate distance between said upper idler wheel shaft and drive shaft equals a distance of (n times the pitch distance+substantially a ½ time the pitch distance).