Joined in 2023 
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63 About this deal
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. Custom frames can be made to fit artwork that is larger or smaller than the standard sizes, or they can be made to fit artwork that has an unusual aspect ratio. Proper fraction button and Improper fraction button work as pair. When you choose the one the other is switched off. If the rim is not marked with its bead diameter you can read this from the tyre – it’s the one dimension they have in common.
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. Standard sizes refer to sizes that are commonly used and widely accepted as being a standard or normal size for a printing or producing artwork on. The use of standard sizes can make it easier to find a frame for your art. Long multiplication means you're doing multiplication by hand. The traditional method, or Standard Algorithm, involves multiplying numbers and lining up results according to place value. These are the steps to do long multiplication by hand: The three-digit number after the dash is the more important. This is the bead diameter at which the tyre fits onto the rim. 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.Some rims are also now marked according to ISO with their bead diameter and internal section (width where the tyre fits); 622-17 for the size usually fitted to touring and hybrid bikes, for instance. But some manufacturers give the overall width instead. Subtract 6mm from overall width to estimate the rim section, or simply measure the distance between the flanges. 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
Tyres suitable for use with dedicated tubeless rims, or with a conversion system which employs tape to seal the rim bed, are marked using a sidewall decal such as tubeless-compatible, tubeless-ready, tubeless-easy or similar. They have a special stretch-resistant folding bead made, usually, of carbon fibre. There is no industry-wide convention for tubeless tyre fitment and satisfactory results are mostly likely using parts made for use together such as Mavic’s UTS (Universal Tubeless System) tyres and rims. Nevertheless, tubeless-compatible tyres are generally available in the standard 29"/700C/622mmISO, 27.5"/650B/585mmISO and 26"/559mmISO formats. It is inadvisable to use non-tubeless tyres without an inner tube as there is a risk of tyre blow-off. Tubular tyres Custom sizes refer to frames that are made in sizes that are not part of the standard size range. Custom frames can be made to fit a specific size or aspect ratio of artwork, or they can be made to fit a specific space on your wall. Insert a decimal point in the product so it has the same number of decimal places equal to the total from step 1.Arrange the numbers one on top of the other and line up the place values in columns. The number with the most digits is usually placed on top as the multiplicand. Use long addition to add your number columns from right to left, carrying as you normally do for long addition. Tubular tyres require skilled fitting; if unsure, consult a suitably trained cycle mechanic. Other sizes including 26" may be encountered; these are rare and it is advisable to make a direct match with a rim before buying. Recommended pressures Proceed right to left. Multiply the ones digit of the bottom number to the next digit to the left in the top number. If you carried a digit, add it to the result and write the answer below the equals line. If you need to carry again, do so.
As far as possible, then, use these columns to convert to ISO dimensions and then have nothing more to do with those old markings! All tyres are marked with a pressure. Sometimes this is an absolute maximum that nobody should need to exceed, or sometimes only a recommended maximum that may be exceeded by heavier riders (such as tandemists). When you've multiplied the ones digit by every digit in the top number, move to the tens digit in the bottom number. These are just a few of the many standard sizes that are available for picture frames. There are lots more and the size appropriate for you will depend on the dimensions and proportions of the artwork that you want to frame.
You should get an instant answer on whether your application has been successful, though in some rare cases Klarna or V12 may need to look at the application in more detail. The ideal relationship between tyre and rim section is about 1.8 to 1, but any tyre from 1.4 to 2.2 times should fit – always provided that the bead diameters correspond.
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