See more: Inner tubes
21" Inner tubes, With steel center valve, suitable for 2.50 - 2.75 - 3.00 - 3.25 - 80/90 - 80/100 -90/90, Metzeler
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.