Inner tube size

Asked by: Julie Collins

The size is almost always written somewhere on the sidewall of the tyre. Inner tubes typically state a wheel diameter and width range for which they will work, e.g. 26 x 1.95-2.125″, indicating that the tube is intended to fit a 26 inch tyre with a width of between 1.95 inches and 2.125 inches.

How do I know what size inner tube I need?

The best way to check what size inner tube you need is to look on the sidewall of your tyre. Tyre manufacturers print the size on the sidewalls, so look out for numbers such as ‘700x23c’ for a road bike, or ’26×1. 75′ which is for mountain bikes.

What size is a 700c inner tube?

Road wheels are usually ‘700c’ sized (622mm in diameter, when measured from the bead seat to bead seat) and will need 700c tubes to match. These are sometimes referred to as 28in tubes, but that’s relatively uncommon.

Does inner tube have to be exact size?

While your diameter measurement needs to be exact, your width measurement does not. Because inner tubes stretch, they typically come in a range of widths. For example, one of our most popular tubes is the 26 x 1.75-2.125” which means it fits a 26-inch diameter tire with a width in the range of 1.75 to 2.125 inches.

What size inner tube do I need for 27.5 wheel?

Inner tube size examples for road and mountain bikes

What does 700c mean?

700C tires



The “700” refers to the rough outer diameter of the tire, although the actual outer diameter will vary greatly, depending on the type of tire and tread pattern. The “C” means NOTHING; it does not stand for “centimeters.” Think about it–a 700-centimeter tire would be HUGE, over 21 feet tall!

Is the inner tube the same size as the tire?

The tube should match the tire size diameter closely. However, tires that are close in bead diameter may use the same inner tube. For example, an inner tube for an ISO 630 tire (27-inch) will also fit an ISO 622 (700c) tire.

IS 700c same as 29?

29″ (ISO size 622) is actually the same rim diameter as 700C, although most 29″ tires will not fit 700C road rims because they’re too wide. 29″ tires are popular with mountain bikers; search for 29″ MTB.

Is 27.5 the same as 700c?

That’s changed over the past decade, so the majority of modern mountain bikes now come either with 29in or 27.5in wheels. These two sizes are equivalent to 700c and 650b wheel sizes expressed in the European ETRTO wheel size designations and have the same bead seat diameters.

WHAT IS 700c wheel size?

700C is the dominant wheel size in the modern bike world, and the biggest of the top three. The other two are 26-inches, and 650B, which also goes by 27.5-inches. The approximate diameters of the rims for these sizes are: 700C = 622 millimeters = 24.5 in.

What happens if you use the wrong size inner tube?

With a tube that’s too big (say, 700 x 25-28) you may find that you can’t inflate the tube sufficiently and so the tire will stay too soft. Again, bumps in the road can lead to punctures, so you must ride very carefully. To sum up: If the tube diameter is too small, then it may not fit on your wheel rim.

What happens if you use a smaller inner tube?

If the inner tube is a lot larger than the tire, it will cause folds and wrinkles inside the tire, which may affect your ride. If you have a tube that is only a little bit larger, then it probably won’t make a difference. While larger tubes will weigh more, they will retain air better.

Can you put 25 tubes in a 28 tire?

Re: 20-25 tubes in 28mm tires??



It’s basically a no-no because as you pump up tyre the inner tube will stretch to fill the void of the wider tyre making it more likely to fail (or so the explanation went).

IS 700c same as 28?

28”/700C/29er



The tyres can differ, but the 28”, 700C and 29er are all the exact same rim diameter. The 700 markings will be followed by the width in mm, and the 28 or 29 markings will be followed by the width in inches. This is the most common wheel size, so look out for familiar markings (such as 28×1.

How many mm is 700c?

Tire Size Chart

Are 700c and 26 the same?

What Size Bike Inner Tube Do I Need? || REI

Is 26 inch tube the same as 700c?

What Is The Difference Between a 26 Inch and a 700c Wheel? This brings us around back to the same answer; they are the same diameter, but a 26-inch tire will fit onto a 700c rim but not the other way around because of the difference in rim thickness.

Will a 26 inch tube fit a 27 inch tire?

In real world applications, a 26″ tube will work perfectly fine in a 27.5″ tire.

Can I use bigger inner tubes?

Yes, it’s perfectly safe to use the next larger size tube in a smaller tire. It’s a common trick used by bike messengers to reduce the chance of flats. The only downside is a slightly heavier wheel since you’re using more tube that you really need.

What does 700x40c mean?

The first number refers to the diameter and the second number is the tire width. On a 700x40c tire, the first number indicates that the outside diameter is approximately 700 millimeters. Tread and tire width can affect the overall diameter, so the 700 is always a rough estimate.

IS 700C same as 29?

29″ (ISO size 622) is actually the same rim diameter as 700C, although most 29″ tires will not fit 700C road rims because they’re too wide. 29″ tires are popular with mountain bikers; search for 29″ MTB.

IS 700C same as 28?

28”/700C/29er



The tyres can differ, but the 28”, 700C and 29er are all the exact same rim diameter. The 700 markings will be followed by the width in mm, and the 28 or 29 markings will be followed by the width in inches. This is the most common wheel size, so look out for familiar markings (such as 28×1.