Originally Posted by
RichinSC1
Might not be long enough for your 140mm rear spacing. Remember, the rear spacing is measured between the inner faces of the dropouts, also known as the rear hub “over locknut dimension” or OLD. 3mm “extra” on each side may not be enough to account for the thickness of the dropouts and provide secure seating of the axle ends in the dropouts. That link indicates it’s for bikes with 135mm rear spacing.
UPDATE: I just checked Tandems East site and Mel has a tandem rear hub from White Industries that is quick release and spaced for 140mm. It’s threaded for a drum and uses cassettes instead of freewheels! Comes in 40 and 48-hole and Mel sells skewers meant for 140mm rear spacing as well. You could run more rear cogs than 6 or 7 that way. It’s worth a phone call to Mel to discuss your options anyway.