![]() It is more or less correct that the outer diameter measures 28 inches. with a tire width of 23 mm, which is usual for a road bike, has in fact only an outer diameter of something more like 26 inches. The marking was created, as the MTB tires are more voluminous and the outer diameter measures approximately 29 inches.īoth indications are, however, very imprecise. Bicycle travelers who want to buy spare tires for a 28-inch touring bicycle anywhere in the world, can tell you a thing or two about it.Ī few years ago 29 inch tires were introduced as a new wheel size for mountain bikes in the US. In countries outside Europe the rim diameter of 622 mm is only rarely used. In many countries it is even the most frequent tire size used. In Europe, 28 inches is a traditional size for touring bicycles. Another answer would be: There is no difference.īoth tire sizes have the same inner diameter of 622 mm and can therefore be fitted on the same rims. The silliest answer to this question would be to say that the difference is exactly 1 inch. Sometimes, you still find them on current models which have already been available for quite a long time.Ģ8 inch and 29 inch tires have the same inner diameter of 622 mm and can be fitted on the same rims. These classical fractional size indications are also often engraved on old Schwalbe tires. We have tried to list in addition all tire sizes which are currently used on the market or which were used in the past. The current Schwalbe sizes and markings are given in bold. For virtually every tire size, you should be able to find a corresponding ETRTO-size in this list. The following list shows all common tire sizes. French size markings are not used for all tire sizes, so, for example, it is not used for MTB sizes. The letter at the end indicates the inner diameter of the tire. 700 x 35C) give the approximate tire outer diameter (700 mm) and width (35 mm). 27.5 inch tires have an inner diameter of 584 mm and are identical with the old French size marking 650B.įrench size markings (e.g. ![]() This is the case, for example, with bicycles having a very long suspension travel or very small frame sizes. This tire size is favored for MTBs which are too small for the very big 29 inch wheels, in order to benefit from the advantages of bigger diameters. When the 29 inch MTB tire size was introduced a few years ago, it had the same inner diameter of 622 mm, known as 28 inch in Europe. Experience tells us that nowadays very few users are familiar with the classical fractional inch dimensions, such as 28 x 1 5/8 x 1 3/8. Therefore, we will continue to use these specifications for all tires. Inch dimensions are widely used in both MTB sport and English language countries. Depending on tire width, various standards for the inner diameter applied. In those days, the exact outer diameter of the tire was defined by the brake. These classifications originate from the time of tire brakes. Oddly enough, tires with an inner diameter of 630 mm are classified as 27 inch. Tires with diameters 622 mm and 635 mm are both classified as 28 inch. For example, diameters 559 mm (MTB), 571 mm (Triathlon) and 590 mm (Touring) are all classified as 26 inch. Inch sizes are not precise and lack accuracy. Another inch marking is 28 x 1 5/8 x 1 3/8 (approximate outer diameter x tire height x tire width) it is also common. 28 x 1.40) states the approximate outer diameter (28 inches) and the tire width (1.40 inches). This dimension is clear and allows a precise classification of the rim size. The ETRTO size specification 37-622 indicates the width of 37 mm and the tire inner diameter of 622 mm. However, older English and French tire size dimensions are still used as well. A tire size usually looks something like this: 245/40R18.Nowadays, bicycle tire sizes are all marked according to ETRTO (European Tire and Rim Technical Organization) standard. When entering the size of the old and new tires, there are three required values from the metric tire size. You can compare P-metric, euro metric, LT, and flotation tire sizes. See the error for various speeds in miles per hour or kilometers per hour. The comparison calculator will also estimate the amount of speedometer error that will need to be accounted for when upgrading tires on a vehicle. It will also calculate the difference in each dimension between the tires to allow you to compare and see if the new tire will work for your vehicle. The tire comparison calculator above will generate all the dimensions of each tire in both inches and millimeters. The first step to comparing tires is to calculate the size of each tire, then compare the key dimensions. You need to ensure the new tires will fit the vehicle, look right, and account for speedometer error. When changing the tires on your vehicle to a new size, it’s important to compare the measurements and sizes of each of them to help determine if the new tires will work.
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