Bike Tube Size Chart | Match Width And Diameter

A bike inner tube must match your tire’s diameter and fall within the tire’s width range to fit, inflate evenly, and hold air properly.

This Bike Tube Size Chart keeps the common sizes in one place, but the real trick is knowing what the numbers mean. A tube is not picked by brand name or wheel label alone. It’s picked by diameter first, then by the width range printed on the box or tube itself.

That’s why tube shopping can feel messy. A 700c tube may fit one road tire and be wrong for another. A 29er tube can fit many 700c gravel tires. A 27.5 tube is often the same diameter as 650b. The inch label on the tire helps, though the metric size on the sidewall is the cleaner match.

If you want the shortest route to the right tube, start at the tire sidewall. You’ll usually see two size formats. One may read 700x35c or 29×2.20. The other may read 37-622 or 57-622. That second number set is the one to trust most. On Schwalbe’s tire sizes page and in Continental’s tube range chart, you can see how one diameter can sit under more than one market label.

How To Read The Numbers On Your Tire

A tire size has two parts. The first number is width. The second is diameter. In the metric ETRTO format, 37-622 means the tire is about 37 mm wide and fits a rim with a 622 mm bead seat diameter.

That last number is the deal maker. If your tire says 622, your tube must suit 622-diameter tires. Then you match the tube’s width range to your tire width. A tube marked 32/47-622 will work in many 700x32c, 700x35c, 700x40c, and 700x45c tires. A tube marked 18/25-622 will not.

Here’s the rule that keeps most riders out of trouble:

• Match the diameter exactly.
• Match the tire width to a tube width range that includes it.
• Match the valve type to your rim hole.
• Match valve length to rim depth if you run deep rims.

Once you use that sequence a few times, tube sizing gets a lot less mysterious.

Bike Tube Size Chart For Common Tire Labels

The chart below covers the tube sizes most riders shop for. Think of it as a fast cross-check, not a reason to skip the sidewall. Tire makers do vary a bit, and the sidewall is still the final word on your own bike.

Tire label on sidewall	Common ETRTO size	Tube range to buy
12 x 1.75–2.125	47/57-203	47/57-203
16 x 1.75–2.125	47/57-305	47/57-305
20 x 1.75–2.125	47/57-406	47/57-406
24 x 1.75–2.125	47/57-507	47/60-507
26 x 1.50–1.75	37/47-559	37/47-559
26 x 1.90–2.40	47/60-559	47/60-559
27.5 x 1.90–2.40	47/62-584	47/62-584
27.5 x 2.50–2.80	63/70-584	63/70-584
700 x 23–28c	23/28-622	18/25-622 or 25/28-622
700 x 30–35c	30/35-622	28/35-622
700 x 38–45c	38/45-622	32/47-622
29 x 1.90–2.40	47/62-622	47/62-622

Why One Tube Can Fit Several Tires

A tube stretches. That’s why brands sell one tube that covers a width range instead of one tube for every single tire width. A 32/47-622 tube can stretch enough to work across a broad run of 700c and gravel tires, yet it still sits neatly inside the casing when inflated.

That stretch range has limits. Put a narrow road tube inside a wide trail tire and it gets thin fast. Put an extra-wide tube inside a narrow road tire and it can bunch up during install. Either mistake raises the odds of pinches, wrinkles, or a tube that won’t sit flat under the tire bead.

If your tire width lands near the middle of a tube’s range, that’s usually the sweet spot. If you sit at the far edge, it can still work, though many riders prefer the next closer match when there’s a choice on the shelf.

Where Riders Get Tripped Up

The biggest mix-up is assuming all 700c, 28-inch, and 29-inch tubes are different. Many are not. Some share the same 622 mm rim diameter and only differ in the width range they cover. The label changes with the bike category, while the rim diameter stays the same.

The next mix-up is mixing 27-inch and 700c. They are not the same size. Old 27-inch road wheels use a 630 mm diameter. Standard 700c uses 622 mm. Close names, different fit.

Same Diameter, Different Names

This is the chart that clears up most tube confusion in shops and at home.

Market label	Bead seat diameter	What it often matches
700c	622 mm	Road, hybrid, gravel
29 inch	622 mm	MTB tires on the same rim diameter as 700c
28 inch	622 mm	Many trekking and city tires
27.5 inch	584 mm	Same diameter as 650b
650b	584 mm	Same diameter as 27.5 inch
26 inch MTB	559 mm	Classic mountain and many kids’ bikes

Valve Choice Matters Too

Tube size is half the purchase. Valve type is the other half. Most tubes come with one of three valve types:

• Presta: Narrow valve, common on road, gravel, and many newer mountain bikes.
• Schrader: Car-style valve, common on kids’ bikes, hybrids, and many entry-level bikes.
• Dunlop or Woods: Seen on some city bikes in certain markets.

Your rim hole decides what fits cleanly. A rim drilled for Schrader is wider than one drilled for Presta. You can use reducers and adapters, though the cleanest fix is still buying the tube with the valve your rim was built for.

Valve length also matters on deep-section rims. If the valve stem is too short, the pump head may barely catch. On standard box rims, a regular valve length is often enough. On deeper road rims, riders often need a longer Presta valve.

How To Pick The Right Tube In Under A Minute

1. Read the tire sidewall and find the metric size, such as 40-622.
2. Match the last number exactly. Here, that means 622.
3. Pick a tube whose width range includes 40 mm.
4. Check your valve type and valve length.
5. When stuck between two tube ranges, choose the one that sits nearer your tire width.

Say your tire reads 700x40c and 40-622. You’d want a 622-diameter tube with a width range that covers 40 mm. A 32/47-622 tube is a normal pick. A 23/28-622 road tube is not.

Install Tips That Prevent Pinches

Even the right size tube can fail if it goes in twisted or gets trapped under the bead. Add just enough air to give the tube shape before install. That keeps it from folding over on itself. After the tube is in, work the tire on with your hands when you can, then go around both sidewalls and check that no tube is peeking out.

Inflate in stages. Bring the tire partway up, inspect both beads, then finish. That slow check takes a minute and saves a lot of fresh-flat frustration.

What To Do If Your Size Falls Between Labels

Some tire sidewalls list old inch labels that don’t tell the whole story. When that happens, trust the ETRTO size first. It strips away the guesswork. If the shop shelf only shows inch labels, match those labels back to the ETRTO range on the box before you buy.

A good tube fit is not about chasing the exact same wording printed on your old tube. It’s about matching the same diameter and a width range that honestly covers your tire. Do that, and most tube choices become simple.