See more: Inner tubes
18" Inner tubes, With steel center valve, suitable for 4.00 - 4.25 - 4.50 - 140/70 - 150/70 - 120/80 - 130/80 - 140/80 - 120/90 - 130/90, 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.