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18" Inner tubes, 18" tires ME-D18 (V1-09-1) With steel center valve, suitable for 3.00 - 3.60 - 100/80 - 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.