Which inner tube fits my tire?

Type the size on the tire (not the old tube). You’ll get the rim size and width range to look for on the tube box.

How tube sizes work

A tube box shows a rim size and a width range, for example 700 x 28-32c or 26 x 1.75-2.125, often with the ETRTO range too (28/32-622). The rim size must match your tire exactly; your tire width only has to fall inside the range. That’s why one tube covers several tire widths.

Valve types

ValveLooks likeWhere you’ll find it
Schrader (AV)Car-tire valve, spring coreKids’ bikes, cheaper mountain and hybrid bikes
Presta (FV / SV)Thin, with a small locking nut on topRoad, gravel and most modern mountain bikes
Dunlop (Woods)Wider base, takes a Presta pump headCity bikes in Europe and Asia

Match the valve to the hole in your rim. A Presta tube in a Schrader-drilled rim will rock in the hole and can tear at the valve base; adapters exist but a grommet is the proper fix. Also check the valve length: deep rims need 60 mm or longer Presta valves.

Frequently asked questions

Can I use a 26 x 2.1 tube in a 26 x 1.95 tire?
Yes, if the tube’s range covers 1.95 (most are labelled something like 1.75–2.125). The rim size, 26 inch / 559 mm, is what has to match.
Do 27.5 and 650B tubes fit each other?
Yes. Both are 584 mm bead seat; the label depends on whether the tube is sold for mountain or road/gravel bikes.

Related

Bike tire size converterType any bike tire size (700x25c, 29x2.2, 26 x 1 3/8, 37-622) to get the ETRTO size, the rim it fits, the inner tube range and sizes you must not mix up.Open calculator →Bike tire size chartEvery common bike rim size in one chart: ISO/ETRTO bead seat diameter next to the inch and French names it is sold under, and what bikes use it.See the chart →

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