slick tyre size conversion
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. Look at our free to use tyre size calculator, used to compare the differences between you OE fit tyres and other alternatives. If replacing a FR70-14, you would look up the appropriate 70-series size, the 215/70R14. Listing in chart does not imply complete interchangeability. Subtract 6mm from overall width to estimate the rim section, or simply measure the distance between the flanges. The ISO size comprises two numbers separated by a dash. Although, the initial two-digit number is the tyre section and roughly indicates the tyre width. If so, then you’ll need to check the markings to be found on the side of the tyre. 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. Refer to the column headed Imperial, Metric or American in order to work out what actual (ISO) size you have. 26×1½ and 26x1.5. Cycling UK’s lorry campaign – what we're doing and what we’ve done: What is the difference between 25mm and 23mm tyres, Choose the best fast-rolling wide tyres - group test, Help community projects get more people cycling across the UK, Third party cover and 24 hour assistance legal line. To bring some order to the situation, most tyres are now marked according to the International Standards Organisation (ISO) in addition to more familiar markings. The three-digit number after the dash is the more important. 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. * When replacing Alpha Numeric tires with Euro-metric or P-metric tires, look for the Euro-metric or P-metric size listed in the equivalent aspect ratio. Most lists the tire size both English, French and German targets and rim circumference in millimeters. This chart will help you find the right size tires to replace those dried up originals. The table below lists most of the sizes of tyre that are likely to be found in the UK. On the other hand it increases the stress on the sidewall of the tyre. The American column is for tyre sizes originating in the USA and where US markings may confuse. Look for the ISO numbers and you always know exactly where you are. As a rule, please only allow yourself a maximum of 2.5% difference +/-. 650B and 26×1½ are both 38-584 and should be marked accordingly. The former is ‘fractional’ and the latter ‘decimal’, and as a rule decimal and fractional tyre sizes that look the same are not.

Read our privacy policy for more information. It should be easy; simply buy exactly the same model of tyre as those already on the bike. Are you confused by the markings on your tyres? 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. If you’re ever in desperate need of a tyre and can find one with the same bead diameter, it will probably fit even if every other thing about it is different; any tyre marked xx-622 will, at a pinch, fit any 622mm rim. Keep in mind these are close approximations and may not be exact replacements. 622–17 for the size usually fitted to touring and hybrid bikes. Nowadays nearly all rims have hooked flanges (required to retain folding tyres) that will hang onto tyres up to three times their width. Choose your tyres or wheels from our extensive selection, Specify when you'd like them to be delivered, Pay online and your tyres or wheels will be sent to you, Call one of our friendly team members on 01482 505526 or Contact us. This is the bead diameter at which the tyre fits onto the rim. For example, when replacing a FR78-14, you would look up the appropriate 75-series size, the 205/75R14. Tubular tyres require skilled fitting; if unsure, consult a suitably trained cycle mechanic. Even worse, the same or very similar markings can sometimes be found on completely different sizes of tyre: e.g. Mountain bike tyres are designed to take this extra stress but road tyres are not. Registered office: Parklands, Railton Road, Guildford, Surrey GU2 9JX. – equals distance rolled in one turn of the wheel) are calculated in the Tyre Size Table. Registered as a charity in England and Wales charity no: 1147607 and in Scotland charity no: SC042541. I replaced my Bridgestone/Dunlop combo with a Continental SuperTwin 3.25 X 19 and an IRC GS-11 3.50S18. Even the most savvy car guys have trouble decoding certain sizes, so the bead radius) corresponds with the distance from the centre of the wheel to the centre of a brake block. Tire sizes can be a bit confusing, as the size designations changed a lot over the years. 28×1¼×15/8, 28×1¾×1¼ or 700×32C, which are all 32–622. Switching from 630 to 622 for example, needs another 4mm of brake reach. Please send me infrequent emails about special offers, and other interesting news.

If replacing a FR60-14, you would look up the appropriate 60-series size, the 235/60R14.

* When replacing Alpha Numeric tires with Euro-metric or P-metric tires, look for the Euro-metric or P-metric size listed in the equivalent aspect ratio. Although they’re familiar they can be very confusing. As a rule, please only allow yourself a maximum of 2.5% difference +/-. 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: e.g. Tire Size Conversion Chart. These will all fit the same size rim. This means that you can easily find the right tire size, although it is a Danish number. The sizes in the above chart do not go as large as modern sizes (180/55 or 240/40) because new bikes are not made to use the Inch Format. ©2015 Tyremen, Witty Street, Hull, East Yorkshire, HU3 4TX. Vintage Tire Size Conversion Chart.

Sometimes you can’t find any ISO size on a tyre, only the old-school markings. From standard bias ply sizes such as 6.70-15 to Alpha Numeric sizes like F70-15, all the way up to modern P-Metric sizing, such as 205/75R15. Other sizes including 26” may be encountered; these are rare and it is advisable to make a direct match with a rim before buying.

The above tire size conversion chart does not mean that these tires are universally interchangeable . It might be supposed that these two tyres are both notionally 26” diameter and one and a half inches in width, but 26×1½ is a whole inch bigger than 26×1.5. Use the following chart to figure out the closest modern tire size to your car's original tires. Some rims are also now marked according to ISO with their bead diameter and internal section (width where the tyre fits): e.g.

tandemists). Tyres of the same size may come with lots of different markings: e.g.

Even worse, the same or very similar markings can sometimes be found on completely different sizes of tyre: e.g. Nevertheless, tubeless-compatible tyres are generally available in the standard 29”/700C/622mmISO, 27.5”/650B/585mmISO and 26”/559mmISO formats.

By comparing this dimension you can see if the brakes will reach when a different size of rim is fitted to your bike. 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 as tubeless-compatible, tubeless-ready, tubeless-easy or similar and have a special stretch-resistant folding bead made, usually, of carbon-fibre. Cycling UK continues to support the UK to cycle, This remains true during this difficult period with the ongoing threat of coronavirus Covid-19, 10% discount off cycle related products in Halfords stores, 15% off BikeRegister security marking kits, Cycling UK Incident Line - Free Cycling Related Legal Advice, 10% off when you spend £100 or more at Freewheel, Cycling UK CycleCover Travel Insurance 10% discount, 10% discount on Cycling UK training courses, CS Healthcare's HealthBridge health plan - first 2 months free, £5 off boxed cycle carriage with Eurostar, 20% off of Havebike’s Collect & Return bicycle servicing, 50% off Discount Cycling Network membership, 50% off a Singletrack print and digital subscription, £75 worth of free accessories with Raleigh, Getting sponsorship to cycle for Cycling UK. Do not exceed the maximum when tyres are marked with a range. Tubeless tyres, as the name suggests, do away with an inner tube and, in its absence, are reliant on the shape and tightness of the tyre bead to ensure the tyre does not blow off the rim at high inflation pressures; in a conventional clincher tyre, the inner tube keeps the bead securely located under the rim hook. For example, when replacing a FR78-14, you would look up the appropriate 75-series size, the 205/75R14. If replacing a FR70-14, you would look up the appropriate 70-series size, the 215/70R14. This increases the cushioning effect: you get more comfort out of the same tyre at the same pressure when you fit it to a narrow rim – yet it still rolls just as easily. Call us on 01482 505526.

As far as possible, then, use these columns to convert to ISO dimensions and then have nothing more to do with those old markings! Wheel fitment and tire size guide and knowledge base Last Update: Nov. 1, 2020, 8:41 a.m. It’s worth noting that these markings have the potential to cause confusion, not least because a tyre’s ‘size’ can be hard to pin down. Most tubulars likely to be encountered today will fit a rim with the same brake track diameter as a 700C clincher rim, and are may be referred to as 28”, 27” or even 700C or similar.


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