The greatest distance cycled in six hours on a tandem bicycle (mixed) is 177.87 km (110.52 miles), achieved by Lady JB Owen and Peter Giesin on the certified Moffat–Mosca road course along Colorado Highway 17, Colorado, USA, on 26 September 2026. The attempt started at 7:05 AM MDT in clear, cool conditions before the riders encountered dense fog, freezing moisture and increasing winds. The record was officiated and ratified by the World UltraCycling Association (WUCA).