440/450-20/21 Michelin Tube TR13 Offset 20/21 CDRET – This is a 440/450-20/21 Michelin tube with a TR13 offset valve stem. Our classic car inner tubes are built using premium materials for a durable and reliable service life. Actual item may differ from photo. Eclectic Tire Company features a huge selection of the best inner tubes for collector tires.