Should I get a 18/25 tube or a 25/32 tube?

Asked by: Krista Cooper

What size tube should I get?

Step 1: Picking the Right Tube Size



The first number is the diameter of your wheel. Sizes such as 26, 24, 20, 27.5, 29 and 700c are common tire diameters. The second number (after the X) is the width of your tire. The range for widths is usually between 1 and 3 inches.

Does inner tube have to be exact size?

All inner tubes will come with a recommended range for tyre width – for example 700 × 20–25 for traditional road tyres, 700 × 25–32 for wider road tyres. A narrower inner tube will balloon out to fill a tyre a few millimetres wider than its recommended width – but don’t take it too far or it might explode.

What is the most common bike tube size?

Finding the Right Inner Tube



While you can find a variety of bikes with wheel sizes ranging from 16 to 27.5 inches, the most common sizes include 26 inches, 27.5 inches, 29 inches and 700c. Tubes can range anywhere from 1 to 3 inches or 19 to 45 millimeters, depending on the type of wheels you have.

What happens if you use a smaller inner tube?

The inner tube should also match the tire width, but, because inner tubes are elastic, one inner tube may fit a range of tire widths. If the inner tube is too narrow for the tire width, it will become very thin when inflated inside the tire body. This will cause it to be more susceptible to punctures and failures.

How do I know what size tube my bike needs?

Quote from video: If you check along the sidewall of your tire it'll tell you your size. So for example this my road bike tire is 700 by 32 that first number is the diameter of the tire.

Will a 1.75 tube fit a 1.5 tire?

They will be fine.

Will a bigger tube work in a smaller tire?

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.

Can you use 700×32 tube in 700×35 tire?

Yes. Tubes stretch a good bit.

Can inner tubes be too big?

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 size tube do I need for my mountain bike?

MTB tubes must be the correct width as well – also measured in inches. This is to allow the tube to expand to the correct size for your tires, and can range from as narrow as an inch right up to a tire width of 2.5″ or greater. If you had a 26 x 2.3″ tire, you would need a 26″ tube that can expand to a width of 2.3″.

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.

What does 700x28c mean?

700 refers to the diameter of the wheel. Almost all road bikes have 700c wheels on them. 700x28c means a 700c tyre which is 28mm wide. 700x32c means a 700c tyre which is 32mm wide.

What size inner tube is best for river rafting?

The Tube Pro™ 44″ single rider (48″ deflated) river tubes are the most universal size for adults and kids. Since the inflated outer diameter is only 44″, it is the perfect size so they can reach into the water to maneuver themselves around.

What size valve extender do I need?

According to this rule of thumb, low-profile rims that measure around 25mm require a 40mm valve stem. For those wheelsets measuring 35-45mm, a 60mm valve stem will normally be long enough, while anything taller than 50mm demands an 80mm valve stem.

How many inches is 700 C?

27.5 inches

The most straightforward answer to “700c to Inches” is that 700c equals 27.5 inches.

What size tube do I need for my mountain bike?

MTB tubes must be the correct width as well – also measured in inches. This is to allow the tube to expand to the correct size for your tires, and can range from as narrow as an inch right up to a tire width of 2.5″ or greater. If you had a 26 x 2.3″ tire, you would need a 26″ tube that can expand to a width of 2.3″.

Will a 29 inch tube fit a 700c?

Mountain bike tyre sizes are usually stated in inches. So a 29 inch MTB tube will have the same diameter as a 700c road wheel, while a 27.5 inch tube will be the same diameter as a 650b road wheel. You can also get 26 inch MTB tubes.

What size inner tube do I need for a 26 wheel?

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.

What size bike tube is 700x35c?

Here’s the quick answer: In simple terms, a 700x35c tire is roughly 27 1/2 inches by 1 3/8 inches (or 1.38 inches).

Can you use 700×32 tube in 700×35 tire?

Yes. Tubes stretch a good bit.

What does 700×28 32C mean?

700x28c means a 700c tyre which is 28mm wide. 700x32c means a 700c tyre which is 32mm wide. Like kouhoutek said the same inner tube will a range of tyre widths, it will say something like “700 x 18-25c” meaning it is for road bikes and will fit anything from 700x18c up to 700x25c.