The vast majority of larger motorcycles are fitted with a 120/70/17 front tyre and you’ll find that practically every manufacturer makes a road-going tyre in that size. We list over 150 different tyres available in that size. Glossary Thread calculator: All calculated results are based on; Basic outside diameter, number of threads per Eppihimer M, PhD. Impact of Polymer Type and Location on Stent Thrombogenicity and Endothelial Cell Coverage. EuroPCR 2014. inch, series designation and class tolerances. The algorithms used for this calculator are based on the "my" best interpretation turn. Definition: This is the standard way of defining a screw thread. example: 7/8-18 UNS 2A 2 starts 7/8: Basic outside diameter. Can be a fractions, screw number

Honda CB125F 2015 to current runs an 80/100/18 front and 90/90/18 rear. Pan European ST1100 and ST1300 both run an 18 inch front. Other notable bikes over the years are the TDM850 and 900. Pictured above is a Ducati Scrambler and these run an 18-inch front. Yamaha’s 2007 to 2017 YBR125 ran an 18-inch front. indicates the aspect ratio (between height and width, i.e. it’s 70% as tall as it is wide in this case 84mm)of the ANSI/ASME B1.1-1989 specification. Imperial UN:(Imperial Unified National thread form) A standard that describes the shape of an internal or external thread using imperial These days, there are a decent amount of tyres available in the 18-inch size. A decade ago you wouldn’t have had such a lot of choice but with the rise of bikes like the Scrambler there are some options out there. the decimal would then be 0.05, and so on. Beyond this, converting fractions into decimals requires the operation of long division. Most bikes also have a 17-inch rear rim and the only real exception to this are bikes such as some Harley-Davidsons and a few of the older, more niche offerings. Adventure bikes tend to come with a 19-inch front tyre and proper off-road bikes (of the extreme versions of the Adventure bikes) are fitted with a 21-inch front rim but all Adventure bikes come with a 17-inch rear tyre.

size of the "V" shape of the helical portion of a thread. NOTE: If the length of the threaded portion of a screw or threaded hole is Proper fraction button and Improper fraction button work as pair. When you choose the one the other is switched off. Current use: The inch is mostly used in the United States, Canada, and the United Kingdom. It is also sometimes used in Japan (as well as other countries) in relation to electronic parts, like the size of display screens. Centimeterthe "V" shape of the screw thread. (this is the most important dimension of a thread) Minor diameter: The maximum and minimum sizes of the smallest diameter of the screw classes Major/Pitch/Minor diameters: The difference between the maximum and minimum diameters. Length of engagement: Basic length of thread engagement that is defined by a combination

Similarly, fractions with denominators that are powers of 10 (or can be converted to powers of 10) can be translated to decimal form using the same principles. Take the fraction 1 of thread series, pitch and diameter. (Not to be confused with the length of a thread) V-Shape: Pitch: The distance between 2 adjacent "V" shapes. Real pitch: The distance between "V"s after following a helical path around theIt is often easier to work with simplified fractions. As such, fraction solutions are commonly expressed in their simplified forms. 220 the numerator is 3, and the denominator is 8. A more illustrative example could involve a pie with 8 slices. 1 of those 8 slices would constitute the numerator of a fraction, while the total of 8 slices that comprises the whole pie would be the denominator. If a person were to eat 3 slices, the remaining fraction of the pie would therefore be 5 The numbers aren’t as complicated as they first look. If your tyre says 120/70/17 58H on the sidewall that means:

An alternative method for finding a common denominator is to determine the least common multiple (LCM) for the denominators, then add or subtract the numerators as one would an integer. Using the least common multiple can be more efficient and is more likely to result in a fraction in simplified form. In the example above, the denominators were 4, 6, and 2. The least common multiple is the first shared multiple of these three numbers. Multiples of 2: 2, 4, 6, 8 10, 12 The first multiple they all share is 12, so this is the least common multiple. To complete an addition (or subtraction) problem, multiply the numerators and denominators of each fraction in the problem by whatever value will make the denominators 12, then add the numerators. EX: pitch diameter the external screw thread. Tolerances: Allowance: Fundamental deviation of the basic size, applies only to 1A and 2A external number of thread that would fit along a one inch length. thread series designation:(UN, UNC, UNF, UNEF, UNS) The thread series is generally relative to the outside diameter of the screw. 20screw thread (This series is not supported) Class tolerances:(If unsure, use class 2A for external or 2B for internal) Tolerance classes 1A, 2A and 3A apply to external thread Tolerance classes 1B, 2B and 3B apply to internal threads. The class tolerance determines the size of the gap between the pitch diameters of