Part Description
21" Inner tubes, 3.25/3.50x21" with steel center valve, also suitable for MH90x21", 100/90x21", 110/90x21", 120/70x21", 120/80x21 and 120/90x21"
Text excerpt from the catalog:
Finest quality butyl tubes, hold air much longer than natural rubber as butyl is non-porous. Stock type 16" inner tubes are available with moulded rubber off-set valve, steel off-set valve as well as steel center valve as used on later Harleys.
