How are inner tubes sizes?
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.
Does inner tube have to be exact size?
No, tubes and tires don’t need to match exactly. Tubes are made from butyl rubber which can stretch. Bike inner tubes will accommodate a limited range of sizes. Larger tubes may be more susceptible to getting pinched between the tire and rim.
What do the numbers on an inner tube mean?
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.
What does 700c mean on an inner tube?
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!
What means 700x40c?
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.
What happens if you use the wrong size inner tube?
A narrower tube that is over-inflated is prone to flats as the added stress can cause the area around the valve to fail. It is also more likely to get punctured by road debris or thorns as the rubber is much thinner than it would be when using a tube of the correct size or wider one.
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 700c 28 or 29?
28”/700C/29er The wheel sizes 28”, 700C and 29er or 29” all refer to the same rim size: ETRTO 622. 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.
What inner tube do I need for 700x40c?
Here it is: pick a tube that matches the numbers embossed on your tire (i.e. “700x40c”). The size of an inner tube varies with the amount of air that you fill them with. So, they’re sold by fixed diameter and range of widths e.g. “700×35-43” (which would work for tires ranging from 700x35c to 700x43c).
Can I put a smaller tube in a larger tire?
Whether using an inner tube that is narrower or wider than the tire it is going to be a pretty straightforward process. You will use it just like you would use one of the correct sizes. A narrower inner tube will fit right into the tire whereas a wider one may need a little bit of coaxing.
What size inner tubes do I Need?
The sizing of a pneumatic fitting is defined by the size of vessels it connects to. Tubes, hoses, and pipes are sized based on inside diameter (ID) and outside diameter (OD), measured in inches (in) or millimeters (mm). A fitting designed to connect to a tube with a 2″ OD is rated as a 2″ OD fitting.
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. Also Know, what does 700x38c mean?
How are inner tubes measured?
Measure the inside diameter if the pipe has female threads. That is the distance across the middle of the pipe, not including the thickness of the pipe walls. Use a ruler or a caliper and measure at the end of the pipe, where there is a cross section. [2]
What inner tubes do I Need?
700 × 20–25mm – for traditional road bikes with 700c wheels and 20 to 25mm tyres