The first two headings need no explanation. All tyres are marked with a pressure. Coronavirus: Advice and guidance for Cycling UK member and affiliate groups, How and why to put on bike rides aimed at women, How to organise a charity bike ride or sportive, Registration Office's/Membership Secretary's Toolkit, Design and create kit for your cycling club or group, Scottish Advisory Panel for Outdoor Education, Cycling infrastructure: Transforming our streets, Cycle/pedestrian bridge (York Millenium Bridge), Long distance cycle path (Comber Greenway, Belfast), Railway station with cycle hub (Leeds CyclePoint), Social enterprise recycling bikes and promotional work - Edinburgh Bike Station, Train company with good cycle carriage (Merseyrail), Urban main road (Old Shoreham Road, Brighton). The American column is for tyre sizes originating in the USA and where US markings may confuse. * 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. Where you see a block of two or more compatible sizes, having the same bead diameter, you can assume that intermediate sizes exist that will also fit the same rim. 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. 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. Look at our free to use tyre size calculator, used to compare the differences between you OE fit tyres and other alternatives. Tire sizes can be a bit confusing, as the size designations changed a lot over the years. That’s how the diameter and circumference (Circ. How do you know what size tyres will fit your bike? 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. I replaced my Bridgestone/Dunlop combo with a Continental SuperTwin 3.25 X 19 and an IRC GS-11 3.50S18. 28×1¼×15/8, 28×1¾×1¼ or 700×32C, which are all 32–622. As a rule, please only allow yourself a maximum of 2.5% difference +/-. The above tire size conversion chart does not mean that these tires are universally interchangeable . What is behaviour change and how does it apply to cycling? Switching from 630 to 622 for example, needs another 4mm of brake reach. Registered office: Parklands, Railton Road, Guildford, Surrey GU2 9JX. Use the following chart to figure out the closest modern tire size to your car's original tires. Cycling UK is a trading name of Cyclists’ Touring Club (CTC) a company limited by guarantee, registered in England no: 25185. Nowadays nearly all rims have hooked flanges (required to retain folding tyres) that will hang onto tyres up to three times their width. 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. 650B and 26×1½ are both 38-584 and should be marked accordingly. Sometimes you can’t find any ISO size on a tyre, only the old-school markings. Off-road tyres are usually marked with a pressure range, from the minimum that will support a rider of average weight to the absolute maximum. 26×1½ and 26x1.5. 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. 28×1¼×15/8, 28×1¾×1¼ or 700×32C, which are all 32–622. 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. * 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. Used primarily for racing, tubular tyres must be fixed to an appropriate rim using glue, cement or adhesive tape. For example: between 18–622 and 25–622 there are tyres of 19, 20, 22 and 23mm section. 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. Check the bead diameter of the tyres on your bike. 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. By comparing this dimension you can see if the brakes will reach when a different size of rim is fitted to your bike. The K5 had 3.25-19 on the front and 3.50-18 on the rear. 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. As a rule, please only allow yourself a maximum of 2.5% difference +/-. 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. But some manufacturers give the overall width instead. 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. Read our privacy policy for more information. 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. Registered as a charity in England and Wales charity no: 1147607 and in Scotland charity no: SC042541. Did you know that some tyres marked 28" are actually much less than 27 inches diameter, or that 26×1.5 and 26×1½ are two completely different sizes! Half of the bead diameter (i.e. 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. Look for the ISO numbers and you always know exactly where you are. Note that American and Japanese branded road tyres tend to be smaller than described and often lack any ISO markings. Listing in chart does not imply complete interchangeability.

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