18 Inch Bike Inner Tubes by ETRTO and Valve

18 inch tube fit guide

Match 18 inch inner tubes by ETRTO, tyre width and valve

An 18 inch tube search can cover junior bikes, trailers, folders and mobility wheels. Check the tyre sidewall first: common 18x1.25 to 18x1.75 routes often use a 355 mm rim, while some wider or specialist tyres use nearby diameters. Choose the tube range only after the ETRTO diameter and valve are clear.

18 inch tyresCompare matching tyres when the old sidewall is cracked, worn or too unclear for a tube-only order.Nearby 20 inch tubesUse only when the tube box lists the exact ETRTO diameter and width range printed on your tyre.Protection and repairRim tape, patches, liners or sealant can solve repeat flats when the tyre size is already correct.All inner tubesReturn to the tube hub if the marking is not a normal 18 inch bicycle tube size.

Use the ETRTO diameter

A tube labelled 18 inch is not enough by itself. Keep the number after the dash, such as 355 mm, matched to the tyre and rim before comparing brands or valve types.

Check width range

The first ETRTO number decides whether the tube covers a narrow 18x1.25 tyre or a wider utility tyre. Do not stretch a narrow range into a much wider casing.