The size in mm according to the European ETRTO standard, for example 47—622, where the first number indicates the width of the inflated tyre and the second the inside diameter in mm. For a near approximation of wheel circumference, you can find tire size written/molded into the side of your tires. Find that tire size in the chart below and enter the corresponding value in meters. Inch based identifications indicate the width in a decimal (26 × 1.75) or as a fraction (26 × 1 3⁄4), and although these size identifications can be mathematically equal, they also can refer to different size tires, which are not interchangeable. ( 28 × 1 1⁄2 is not the same size as 28 × 1.50) Bicycle tires come in a variety of sizes, mostly depending on the type of the bike and the terrain you're riding. So when shopping for new tires, you'll need to know exactly which will fit your rims.

When a is a fraction, this essentially involves exchanging the position of the numerator and the denominator. The reciprocal of the fraction 3 Two tyres with the same ISO markings are completely interchangeable, even if one seems to be metric and the other is also marked in inches. For example, 650B and 26×1½ are both 38-584 and should be marked accordingly. Look for the ISO numbers and you always know exactly where you are. When scientific notation is applied, a large number is transformed into a corresponding decimal number that is between 1 and 10, multiplied by 10 raised to a given positive power, and small numbers are transformed into a corresponding decimal number between 1 and 10, multiplied by 10 raised to a given negative power. The Schwalbe Marathon is the forefather of all high-quality Touring tyres and the undisputed original. On the other hand it increases the stress on the sidewall of the tyre. Mountain bike tyres are designed to take this extra stress but road tyres are not.Converting numbers into numeric form can be very beneficial in a range of disciplines including engineering, mathematics, and computing. In a calculator or computer, E or e, which stand for exponential, are employed to denote the power of 10. E Notation It is often easier to work with simplified fractions. As such, fraction solutions are commonly expressed in their simplified forms. 220 ISO 965-3:1980 ISO general purpose metric screw threads - Tolerances - Part 3: Deviations for constructional threads

This scientific notation calculator is used to convert scientific notation to other representations of numbers like engineering notation, decimal, and standard form. What is scientific notation? Sometimes you can’t find any ISO size on a tyre, only the old-school markings. Although they’re familiar they can be confusing. Tyres of the same size may come with lots of different markings: 28×1¼×15/8, 28×1¾×1¼ or 700×32C, for example, which are all 32-622. Move the decimal point to the left or right equal to the power of 10 times. Meaning here is if the power of 10 is 3, move the decimal point to the right 3 times. For the most accurate data from a speed sensor like the Wahoo RPM Speed or Blue SC, measure and input your wheel circumference in the Wahoo Fitness App. An accurate speed sensor can also improve the speed/ distance data accuracy of GPS Bike Computers like the ELEMNT, ELEMNT ROAM, and ELEMNT BOLT, especially in tree cover or near buildings.Nowadays, bike tires are typically marked according to ISO standard ( ISO 5775), a system originally developed by ETRTO (European Tire and Rim Technical Organization), but older English and French tire size dimensions are still used as well. Use the data from the following tables to determine interchangeability and convert between ISO / ETRTO, English, and French sizes. Learn more about size markings here. BSPT - British Standard Pipe Taper threads & BSP or BSPF - British Standard Pipe Parallel (Straight) threads. Another reason not to exceed the 2.2 limit on road is that a more bulbous tyre can deflect side ways with a noticeable effect on control and road holding. Conversely, fitting a tyre of less than 1.4 times the rim section will result in a harsh ride and more rolling drag than a larger tyre at the same pressure. Tubeless tyres In engineering, fractions are widely used to describe the size of components such as pipes and bolts. The most common fractional and decimal equivalents are listed below. 64 th

It is common to designate metric fine threads with the capital M plus an indication to their nominal outer diameter and their pitch: The European ETRTO standard has been used in the industry since the 1980s, but is only slowly being carried through to general parlance. Old indications usually cannot be translated into metric sizes. In the beginning, there have been various measuring systems, with every country that manufactured bikes developing its own method of marking. The same size bike tire could be found with different numbers in different countries. As cycling has become more global, a standardized approach was needed. The power of ten is negative three. This means we have to move the decimal point three times to the left. The initial two-digit number is the tyre section and roughly indicates the tyre width. Its actual width is normally less, but varies according to how the tyre is designed and the width of rim to which it is fitted. But the height of the tyre usually corresponds quite closely to tyre section, so overall diameter approximately equals the bead diameter plus twice the section.That’s how the diameter and circumference (circ – equals distance rolled in one turn of the wheel) are calculated in the Tyre size table. These figures are useful for setting your cycle-computer and precisely calculating gears. How do you know what size tyres will fit your bike? It should be easy: buy exactly the same model of tyre as those already on the bike. Of course, this isn’t much help if identical tyres aren’t readily available, if you fancy something different or if you’re looking for replacements in unusual and hard-to-find sizes. as shown in the image to the right. Note that the denominator of a fraction cannot be 0, as it would make the fraction undefined. Fractions can undergo many different operations, some of which are mentioned below. Requirements for thread form, dimensions, tolerances and designation for fastening pipe threads, thread sizes.