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18" Inner tubes, With steel center valve, suitable for 180/55 - 160/60 - 170/60 - 150/80, 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.