What do the numbers on an inner tube mean?

Asked by: Melissa Allen

The numbers refer to the dimensions of the tires that the tube is meant for. 700 is the wheel diameter in mm, and 28/38 means that the tube will fit tire widths from 28-38 mm. As far as I know, the dimensions used are the same that are printed on tires, so you can just look at your tire to know which tubes will fit.

How do I know my inner tube size?

Checking the Inner Tube Size You 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.

What does 700×20 28c mean?

For example, 700×20/28c means that the tube can be used with 700cc tires range from 20cc to 28cc wide. I can answer the first part of your question. The second set of number is the width of the tires. For example, 700×20/28c means that the tube can be used with 700c tires range from 20c to 28c wide.

What does 700×28 38c mean?

700x38c is the size of your bicycle tire. 700 is the nominal diameter of the tire in millimeters. 38 is the width of the tire (as seen if you were looking at your bike from the front/back). C refers to the old French system of classifying wheels according to their Bead Seat Diameter.

Is a 26 inner tube the same as 700?

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.

What does 4.80 8 mean on a tire?

Lawn tractor tires using the two-number system display numbers as 4.80-8, for example. This means the tire’s width is approximately 4.8 inches and the rim is 8 inches in diameter. Those are the only two numbers you need to find the right size replacement tire.

Is 28 inch the same as 700c?

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.

What is the difference between 27.5 and 700c?

The difference between 27.5 inches and 700c’s is (literally) 1.5 mm’s. Considering the BSD of 700c tires is 622, you don’t think they’d fit?

What does 700c mean for bikes?

700c is the size of your bike tire, according to the ‘French system’. The “700” number is the stated diameter of the bicycle tire in millimeters. “c” is the width code of the tire (as you would see if you looked at your bike from behind or in front).

Are 700c and 29 the same?

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.

Can you put 29 inch wheels on a 700C?

Yes! But make sure that the rim widths are the same. 29″ (ISO size 622) is the same inside diameter as 700C, but some 29″ tires will not fit 700C road rims because they’re too wide.

What size tires can I put on a 700C rim?

Tyre widths available for the 700C/622mm size standard vary from 18 to 47mm, with popular widths such as 23, 25 and 28mm in the mix. The big-wheeled mountain bikes known as 29ers also use this size, so there are off-road tyres up to a whopping 75mm wide.

Can I put 700C tires on a 29er?

700C tyres on 29er rims works just fine; just beware of running narrow (25C and below) tyres on wide rims.

What does 700x40c mean?

700x40c is the measurement of your bicycle tire and is sized according to what used to be known as the ‘French system’. ‘700’ is the nominal diameter of your tire, measured in millimeters. ‘x’ just means multiplied by. ’40’ is the second number and is the nominal tire width, also measure in millimeters.

Which is bigger 27 or 700c?

The rim diameter of a 700c wheel is actually slightly smaller than that of a ’27inch’. 700c bead diameter is 622mm whereas 27″ bead diameter is 630mm.

IS 700c 28 or 29 inch?

willem jongman wrote: So to make it absolutely clear: 700c, 28 inch (or at least nearly all of them) and 29 inch are all the same: etrto 622.

Is there a difference between 700 and 700c?

At one point in time, “700c” was a standard tire/rim size, where “c” indicated the bead seat diameter and “700” was the diameter, in millimeters, when the tire was installed and inflated. That “700c” tire size has a 622 millimeter bead seat diameter.

What size tire is 700x38c?

What Size Is 700x38c? A 700x38c tire is a bicycle tire with a nominal diameter of 700mm (roughly 27.5 inches) and a width of 38mm (approximately 1.5 inches).

What does 700c 30c mean?

In short – the 700x25C is a French nomenclature for tire size meaning tire diameter of 700mm and tire width 25mm and C is the width of the rim (A is very narrow, D is wide). Thus the number between “x” and “C” is the tire width in mm. For more information you can read a section on tire sizing on Sheldon Brown page.

What does 700×25 28C mean?

New Specialized tires have split sizing. So your 700×25/28 tires have the width of a 25c and height of a 28c.

What does 700x35c mean on a bike tire?

French size markings (e.g. 700 x 35C) give the approximate tire outer diameter (700 mm) and width (35mm). The letter at the end indicates the inner diameter of the tire.

What size is 700 28C?

Tire Size Chart

Is 700×28 same as 700x28C?

Size wise there is no difference. Usually the cheaper one is wire beaded and the more expensive is a folding bead. Unless its older version model versus new version.

What does 700x45c mean?

The second measurement type (700x45c) is a 45 mm wide tire that also fits on a rim with a 622 mm bead seat diameter, the 700c is an old French sizing nomenclature based on the final external diameter being 700 mm for width class of tire (e.g., a, b, c widths).