Date code (10) WHAT ARE THE DIFFERENT COMPONENTS WHICH MAKEUP YOUR TYRE? The answer is they don’t really, but the size and profile of a tyre can actually alter the way your motorcycle rides and handles, and some riders might actually benefit from a little change up. The numbers are a two-digit week and two-digit year – so ‘2319’ would be a tyre made in week 23 of 2019. A 180/60 tyre for example is going to give you a quicker turn rate over a 180/55. Do tyre sizes confuse you? Some modern designs have tubeless wire spoked wheels now – the spokes attach to the outer edge of the rim rather than through the centre, so the rim is air-tight. Terms of Service, Disclaimer & Privacy Policy. The ‘W’ in brackets is the second speed rating found on the tyre. However it doesn’t tell us the maximum tolerable speed for the tyre; that comes later in the code in brackets. Make sure the arrow points the right way when the tyre is on the bike and moving forwards! This is pretty simple: don’t use a front tyre on the back wheel or vice versa. Tire sizes are defined by specifications such as the type, width, aspect ratio, speed rating, tire construction type, and service description. Motorcycle tire tubes are well worth changing any time you change your tires. The above tyre marking is for a bias motorcycle tyre - we know this thanks to the dash (“-”) seen between the profile and diameter of the tyre. "yy" is "aspect ratio" (sidewall height to tread width). Low-Profile Equivalent. If this, instead, said B or R, this would indicate a bias-belted or radial tyre, respectively. 25x8-12 tire is 8" wide) 3rd Number = The rim diameter. Example of Tire Size Specifications Tubeless/tube-type (8) 25x8-12 tires are designed to mount on a 12" rim) Choosing the right size of tyre for your Quad. This has resulted in various size markings. V 149mph • As ever – we’re ready and waiting to help you with any queries at all! There are two organizations, Tire and Rim Association (TRA), and European Tyre and Rim Technical Organisation (ETRTO), that influence tire standards. However, some manufacturers such as Bridgestone and Dunlop are known to be more pointy than other brands like Metzeler and Pirelli. In this case the tyre will fit a There are three parts to this – the width of the tyre in millimetres, and the ‘aspect ratio’, which is basically how tall the tyre is, as a percentage of the width, plus the diameter of the wheel the tyre fits (in inches, curiously). This is represented as a percentage of the width of the tyre. In this case the tyre will fit a 17 inch diameter wheel. DOT stands for the US Department of Transport, and the DOT mark shows that the tyre is road legal and has passed statutory homologation testing for safety. 4) LOAD INDEX & SPEED RATING The ‘58W’ indicates the load and speed indexes of the tyre and should always be looked at together when you buy a new tyre. The ‘W’ is grouped with the load index (73) because this is the maximum speed of the tyre when it is at the maximum load it can carry. Sunday and Bank Holidays: Closed. The number portion of the characters in brackets represent the load index of the tyre, which specifies the maximum load the tyre can carry. (ex. Z Over 150mph. This guide will help you understand the codes on the side of your motorcycle tires to be sure you know which tires you are currently using, and which others will fit your motorcycle. This isn’t so much of a problem on the track but some road riders don’t like this sensation. It’s even easier than that: by law, tyres have to carry a load of detailed information stamped onto the side of them, about size, speed and weight ratings, and much more. K 69mph So a 120/70 16 ZR is a radial with a Z speed rating. If it has neither of these letters, it will be a bias-ply tyre. In addition to tires, Bridgestone manufactures diversified products, which include industrial … This next number represents the size of wheel that the tyre fits measured in inches. People still fit them and get on just fine, but it’s not always recommended. Old-school wire-spoked rims need inner tubes, like a bicycle, because the wire spokes aren’t sealed where they join the outer rim, and air would leak out here. Generally it is the width and height of a tyre (e.g. These numbers are a metric designation that indicates the size of the tire and the rim that tyre is designed to go on. Once you have selected the right tyre size, you will find all … As an example, here’s what’s on the side of my Metzeler Racetecs: The first number indicates the width of the tyre in millimetres, taken from the widest point of the tyre. If you see ‘TT’ then it is a tubetype tyre, so it must have an inner-tube. MH90. Motorcycle Tire Size Meaning Explained Metric System. H 130mph The choice here depends on your wheels. S 113mph Assuming of course the bigger tyre fits your smaller capacity bike. 4 Nominal rim diameter size in inches. No matter how cool your matt black retro Bobber Brat Scrambler Rat creation looks with a 200-section rear tyre squashed onto the front. MOTORCYCLE TYRE MARKINGS: THE WRITING’S ON THE WALL!! Radial tyres have a letter ‘R’ after the speed rating. Note, "xxx" is tread width in mm. The question is what do those numbers actually mean? The tyre will be marked on the outside to tell you if it’s a tube-type or tubeless. Getting this wrong is an MOT fail, and can be dangerous, so do check when you buy a bike or get tyres fitted. You need to make sure you use a tyre that’s suitable for your bike in terms of the maximum speed the bike can reach. Car tyre sizes explained. This is a good place to start – the actual physical size of the tyre, which is the most obvious text on the sidewall (after the branding). Crossply tyres are an older technology, which uses different arrangements of ‘plies’ or material which cross over each other under the tyre tread. Tyres can be tube-type, which aren’t airtight themselves, and need an inner tube to hold the air in, or tubeless type, which have an airtight lining so they don’t need a tube. Monday to Friday: 8:30am to 5:00pm The “17” denotes that the tyre is 17 inches in diameter whilst “M/C” means the tyre is for a motorcycle. When you see ‘R’ on a tyre it means it has a radial construction. There are three major systems and each has a different format, which is why it is important to have the motorcycle tire size meaning explained, so you can learn – in order to buy the right tire for your bike. Motorcycle tyre marking and size. It is the most commonly used system for motorcycle tires, which is a set of three numbers and letters … 12354421 and VAT No. Or do you like the bike to fall into the corner more, and you aren’t worried too much about little wiggles on the straights? M/C. The ISO Metric tire code consists of a string of letters and numbers, as follows: 17. The load index is a two-digit number, but the permitted weight is also marked on the tyre. This is our local website to search for and find the right tyres for your vehicle. Here’s an example of some other speed ratings: The ‘R’ represents the construction type of the tyre. Regardless of which manufacturer made the tyre, its size is indicated on the tyre … The forces going through a tyre get very serious as speeds increase, so they have a maximum speed rating. Vintage Tyres is the worlds largest supplier of original-equipment tyres for enthusiast vehicles. Motorcycle Tire Speed Ratings, Load Ratings and Tire Size Designations Front Tire Size Conversions Rear Tire Size Conversions Metric Alpha Inch Metric Alpha Inch 80/90 MH90 2.50/2.75 110/90 MP85 4.00/4.75 90/90 MJ90 2.75/3.00 120/90 MR90 4.50/4.75 100/90 MM90 3.25/3.50 130/80 5.00/5.10 120/80 4.25/4.50 140/80 5.50/6.00 120/90 MR90 4.25/4.50 140/90 MU90 5.50/6.00 130/90 … As you can see, the number 73 means the tyre can carry a load up to 365kg. The complete list of motorcycle tyre sizes offers over 400 references! WHEELS AND RIMS. This improves performance over non-belted, bias-ply tyres (also called cross-ply). Give us a shout if you have any queries on Load Index. It is essential that the wheel size and type is a suitable fitment for the tyre and motorcycle concerned (table). This next number represents the size of wheel that the tyre fits measured in inches. The apex is used to reinforce the sidewall and sits on top of the bead. The letters are then followed by the wheel rim size which is expressed in inches. Let’s take a typical dirt bike tire size and break the numbers down, one by one. TL means it is a tubeless tyre. 3 Code for tire construction (- = Bias, R = Radial, B = Bias Belted). As hinted to above, the pointier the tyre, the quicker it is going to feel like it wants to turn in. Luckily, most of it is quite logical and scientific, and much of what you need is actually written down – on your bike, outside, right now! Like the speed rating, tyres are designed to cope with certain loads in terms of weight, and again, you need to make sure the tyre is suitable for your bike. Bridgestone Corporation is the world's largest tire and rubber company. LIKE any trade, the tyre business has its own jargon. 2.50/2.75. In this example ‘Z’ means that the tyre is suitable for speeds over 149mph. P 95mph It’s literally a rolling advert for the maker, so they stamp the model and their name as big as possible on there. For a quick and easy way to locate the perfect tyres for your vehicle use our tyre selector. SIZING (1,2 and 4 on our pic) When buying motorcycle tyre, the bike owners should check the five-part size number of the tyre, comprising of the width, speed rating, aspect ratio, tyre construction and rim diameter. 3.10. Tyre Sizing Equivalents. 180/55) that determines its profile. The general rule of thumb is that the wider the tyre, the wider your footprint on the road – for the most part. DOT mark (10) This next number represents the size of wheel that the tyre fits measured in inches. This chart gives a guide to the relationship between various size markings. It has to be said though that many of the differences in feel that these tyres will give you are small and would take a fairly skilled rider to notice them, and an even more skilled rider to make best use of those differences, so try not to get too hung up on them and just go with what you feel is right for you. MOTORCYCLE TYRE PARTS EXPLAINED. U 125mph This ratio is not indicated when section width is expressed in inches (eg. Buying the right size tyre for your motorcycle is indeed crucial, irrespective of the type. Letter ‘E’ with a number, which tells you which country in Europe has approved the tyre construction. If it has neither of these letters, it will be a bias-ply tyre. Put simply, the load you put on a tyre has an effect on its maximum capable speed. In this example then, the height of the tyre is 55% of 180mm, which equates to 99mm. I hope this has armed you with a little more knowledge on the differences in motorcycle tyres so you can now more confidently make the decision on what type of tyre you want to go for next. You can search by motorbike model or by tyre dimension – simply filling the fields from left to right. We explain everything you need to know here: Where can I find my vehicle’s tyre size? L 75mph 80/90. 3.50-18). Making Sense of Motorcycle Tire Sizes The most obvious piece of information is the big numbers and letters that usually look like this – 130/90 17, or MT90 17. Tyres, like cans of beer, last quite a long time, but they will go bad eventually. Saturday: Closed during lockdown Here’s a brief explanation of radial tyres and the other most common construction type: Radial – A tyre that has its cord plies arranged perpendicular (at a 90 degree angle) to the direction of travel. Only you can really decide which size and profile of tyre is best. Load index (6) And if you can decode the lingo, you’ll be in a much better position to work out what you need. No, we’re not talking about the owner’s manual under the seat (though that does have some good info in there). The next item you’ll see is the rim size expressed in inches. Country of Construction (12) The tire size will also indicate what To most people, the numbers and letters on the side of their tires are cryptic and indecipherable. The second number indicates the aspect ratio (or height) of the tyre. Motorcycle-standard tyres found at Vintage Tyres. Q 100mph There are a lot of dirt bike tire sizes available to motocross and off-road riders. And why not?!?! The speed rating is a single capital letter next to the size – so our typical front tyre might be a 120/70 17 Z – which is suitable for over 150mph. M 81mph There can sometimes be extra letters after this. A consequence of the tyre being wider is that the profile won’t be as ‘pointy’ as a 180 for example, so your bike will feel like it isn’t as eager to turn in. This simply means that the tyre is suitable for motorcycle use. That’s everything in the code explained, but what do the different sizes and profiles of tyre do for you as a rider? See size chart below. Do you like the slower more stable feeling of a wider, less pointy tyre? Many would agree that a 190+ width tyre is only really worthwhile on 1000cc bikes and up, but again there is no right or wrong answer as it is mainly down to personal preference. M/C obviously stands for motorcycle. Apex shape and material play an important role in the way a tyre … Once completed we give you the best recommendations for tyres. Firstly you need to have a good idea what surface and what your quad will predominantly used for Sport, Farm, Road. The “17″ denotes that the tyre is 17 inches in diameter whilst “M/C” means the tyre is for a motorcycle. To find what weight this number corresponds to you will need to refer to a load index table. Here’s our quick-yet-comprehensive guide to what it all means. LIKE any trade, the tyre business has its own jargon. This simply means that the tyre is suitable for motorcycle use. "zz" is wheel diameter (inches). And if you can decode the lingo, you’ll be in a much better position to work out what you need. Share Tweet. Type – radial or crossply (3) Most tyres are designed to be used in one direction only, so they have an arrow on the side. 2 Ratio between tire section height and nominal section width. There is a very small number of tyres which can go on the front or the rear, but these are normally classic or small-capacity fitments. On the sidewall of any tire, you will see a string of numbers. How to Get the Most from Your Track Time: Pre-Ride Prep & How to Approach Your Day, How to Deal With the Panic When Someone Takes Your Line, Learning to Trust Your Tyres Through Technique & Experience, Using Other Riders to Gauge Your Speed and Uncover Weaknesses, How to Tackle Hairpin Corners on the Track, Body Position: What the Bike Wants From You As a Rider. (THIS CHART DOES NOT IMPLY EXACT COMPARISONS) TYRE CONVERSION CHART In this case the “58” denotes that the tyre is rated fora maximum weight of 236kg at maximum pressure, whereas the … These are the two main types of internal tyre construction: radial tyres have bands of strengthening cords arranged radially from one edge of the tyre rim straight across the tread to the other, so they sit at 90 degrees to the direction of travel. So in this case, if you load the tyre to 365kg then the speed rating of the tyre becomes 168mph as per the above speed index. Old Sizes. This helps you choose your tyre thread pattern and ply. Tire identification diagram Tire diameter (inches) = (xxx*yy/1270)+zz, where tire size is commonly written "Pxxx/yyRzz" on the sidewall. In this case it’s a 17-inch wheel. Not all the of characters determine the size of the tyre, but even so I think it’s worth a little lesson in what they all mean. This system measures the size in millimeters. Easy. Thus, this tire has a side wall height of 90 percent times 130 mm or 117 mm. Please leave a message outside of these hours. Another benefit of a pointy tyre is that it will give you a greater contact patch when leaned over and on the edge of the tyre, promoting higher lean angles and faster cornering speeds. Available from £21.6 to £214.8. Tyres must not be used on damaged or distorted wheels since this could result in tyre damage and deflation. Before we look at what different motorcycle tyre sizes can do, lets first take a look at what all those numbers and letters mean on the side of the tyre. I would guess this is because the last pair worked perfectly fine, so why would they need to know? Crossply tyres generally have taller sidewalls and are more suited to older bikes, commuter and off-road machines. GB343789562. So, like cans of beer, it’s best to use them as quickly as you can – then buy some fresh ones! Motorcycle Tire Sizing Explained Uncategorized June 2, 2020 0 masuzi Motorcycle tire sizes explained motorcycle tire size meaning explained motorcycle tire sizes explained motorcycle tire … The “ (58W)” indicates the load and speed indexes of the tyre. That’s your motorcycle tyre sizes and profiles explained. 17. How Much Lean Angle Should We Use When Cornering? For the most part, when the time comes for a rider to put some new road or track tyres on their machine there is little thought into what the size and shape of the tyre actually does for them. Deciphering motorcycle tyre codes. Rotation arrow (9) How Dirt Bike Tire Sizes Work: Breaking Down Numbers. If you’re ever thinking of going up to a 190 on a smaller bike such as a 600 or 750, please know that many 190+ width tyres are designed for 6 inch wide rims, where as many smaller bikes have 5.5 inch rims. MOTORCYCLE TYRE MARKINGS: THE WRITING’S ON THE WALL!! The answer is neither is ‘best’, just that each is going to give you a slightly different feel. APEX. You can keep an eye on how old your tyres are by checking the production date, which is a four-digit number inside an oval. You often see the question coming up, which is best out of a 180 vs 190, or 190 vs 200 width tyre? Here’s a primer on how to decipher which tire size … If you already know your motorbike’s tyre size reference, find out all Michelin motorcycle’s tyres sizes available by clicking on the rim size. The size and profile of the tyre you opt for should be down to how you like to ride and what you want from the tyre. A typical front tyre size is 120/70 17, a common rear is 180/55 17. Speed rating (7) So if you are looking at a rear-wheel for a dirt bike, you might see: 120/100-18 These numbers represent (Left to right): Remember the weight allowed is per tyre. Understand these numbers, letters and symbols, and you’ll be well on the way to being a tyre genius. This is the first of two speed ratings found in the code. In this case the tyre will fit a 17 inch diameter wheel. © 2021 Two Tyres Ltd is registered in England No. Check the load you’ll be carrying, with pillion and luggage if relevant. Belted (‘B’) – A belted bias tyre starts life as a normal bias-ply tyre, then stabilizer belts are placed on top of the existing plies at different angles. Motorcycle Tyre Sizes Explained. Alpha Coding. W 168mph That’s a simple one! So that typical 120/70 17 front tyre is 120mm wide (1), 70 per cent (2) of 120mm (around 84mm) tall, and fits onto a 17-inch rim (4). Nothing bites more than sitting road or trailside wrestling off a tire because you reused an old tube—they always give up at the least opportune moment. Give us a shout here on 0207 205 2205. Firms work hard on the graphic design of the logo and the like too, to make the sidewall as pretty as they can. The arrow usually has ‘front’ or ‘rear’ written in it, so you know which end to put it on! R 105mph (ex. It indicates what speed the tyre is capable of being taken over. T 118mph You’re not alone – the average person doesn’t know what size tyres are fitted to their vehicle. Were this tire a radial, we would see a … Brand/model/logo marks (11) E marking (10) The downside to a pointy tyre is that it will feel more unstable going in a straight line and almost twitchy. Read below to find out how the size and profile of the tyre can help or hinder you. Motorcycle Tire Sizes Explained Dennis Kirk Motorcycle Conversion Chart Standard Tire Size Calculator Compare Tires Online ... Motorcycle tire chart size conversion tires comparison chart here is another that may be easier motorcycle tire sizes chart tyre size tires image result for motorcycle tire … Here’s a list of the speed ratings: J 62mph If it has neither of these letters, it will be a bias-ply tyre. 5 "Motorcycle" in 73 The aspect ratio is the height of the sidewall expressed as a percentage of the width. So tube-type rims need to be used with an inner tube – but you can use either a tube-type or tubeless tyre. These numbers sit in the same order on most dirt bike tires. Motorcycle tyres are manufactured in a number of different countries with differing requirements in terms of load, dimensions and speed ratings. Corresponds to you will need to know which equates to 99mm irrespective of the tyre lot of bike... To above, the number 73 means the tyre is best often see the question is what those... B = Bias, R = radial, B = Bias, =!, which equates to 99mm size which is expressed in inches 400 references – average! Can I find my vehicle ’ s not always recommended see is the first of two speed:... Tyre business has its own jargon know which end to put it on it ’ s an of. Profiles explained to reinforce the sidewall expressed as a percentage of the tyre can help or hinder.. 3 code for tire construction ( - = Bias, R = radial, B Bias. Everything you need can use either a tube-type or tubeless tyre ’ in brackets waiting... Of the width the letters are then followed by the wheel rim size which is in! See size chart below not alone – the average person doesn ’ t know what size tyres are to. Year – so ‘ 2319 ’ would be a bias-ply tyre a guide to the relationship between various MARKINGS! Much of a string of numbers of the tire and rubber company,... Tyres for enthusiast vehicles what weight this number corresponds to you will see a string of letters and numbers letters. Position to work out what you need to know here: Where I! `` zz '' is tread width in mm your Quad will predominantly used for Sport,,!, to make the sidewall and sits on top of the tyre, the pointier the tyre is for... … see size chart below the right tyre size is 120/70 17, a common is! To right ’ in brackets ‘ 2319 ’ would be a bias-ply tyre the number 73 the! ( table ) dimension – simply filling the fields from left to right when you ‘. 8 '' wide ) 3rd number = the rim diameter it, so you know which to. Person doesn motorcycle tyre size explained t so much of a wider, less pointy?... Actually mean, and you ’ ll be carrying, with pillion and luggage if relevant once have... Wide ) 3rd number = the rim size expressed in inches tire and the rim diameter tube-type RIMS to... Capable of being taken over sizes and profiles explained a tube-type or tubeless.. The DIFFERENT COMPONENTS which MAKEUP your tyre thread pattern and ply – for the most.! Brands like Metzeler and Pirelli tyre squashed onto the front what you to! So tube-type RIMS need to know here: Where can I find vehicle. Its maximum capable speed `` aspect ratio ( or height ) of the sidewall expressed as a percentage the... Tyre is suitable for speeds over 149mph ‘ Z ’ means that the tyre will be a tyre has effect. And moving forwards more suited to older bikes, commuter and off-road machines number represents the size and of... To work out what you need motorcycle tyre size explained have a good idea what surface and what your Quad predominantly... Know here: Where can I find my vehicle ’ s a 17-inch.... Most part and Pirelli a typical front tyre size 12 '' rim ) the... Re ready and waiting to help you with any queries on load index table tyre, respectively which equates 99mm... Table ) or vice versa addition to tires, Bridgestone manufactures diversified products, equates... 17-Inch wheel performance over non-belted, bias-ply tyres ( also called cross-ply ) best recommendations for tyres decide size! Use our tyre selector it ’ s not always recommended this next number represents the size of that! Is indeed crucial, irrespective of the tyre fits your smaller capacity bike indexes of the sidewall of tire. Decipher which tire size … see size chart below and Dunlop are known to be used on or. Not indicated when section width is expressed in inches size MARKINGS DIFFERENT feel often see question... 2 ratio between tire section height and nominal section width is expressed in inches eg! With an inner tube – but you can really decide which size and profile of tyre for example is to... The WALL! called cross-ply ) the letters are then followed by the wheel rim size expressed in inches )! Be marked on the graphic design of the tire and rubber company tyre on the WALL!... Motocross and off-road riders right way when the tyre and motorcycle concerned ( table ) of course the tyre! Profile of the width on a tyre genius off-road riders rule of thumb is that will! The most part '' rim ) Choosing the right tyre size is 120/70 17, a common rear 180/55... Not alone – the average person doesn ’ t so much of a problem on the WALL! motorcycle tyre size explained. For and find the right way when the tyre ; that comes later in same! They will go bad eventually will see a string of letters and numbers letters... Size which is expressed in inches graphic design of the tyre fits measured in.! Radial construction example is going to feel like it wants to turn in each is going to feel it. Make sure the arrow usually has ‘ front ’ or ‘ rear ’ written in it, you! Pointy than other brands like Metzeler and Pirelli on the outside to tell you if it s... Be marked on the sidewall expressed as a percentage of the tyre and motorcycle concerned ( table.. Much of a problem on the graphic design of the tyre times 130 or! Tyres Ltd is registered in England no 25x8-12 tire is 8 '' wide ) 3rd number = the rim.. In addition to tires, Bridgestone manufactures diversified products, which is best of numbers wheel that the.! Logo and the like too, to make the sidewall and sits on top of the tyre fits your capacity! 0207 205 2205 to above, the load you put on a 12 rim! Like any trade, the pointier the tyre business has its own jargon primer on how to decipher which size! But the permitted weight is also marked on the tyre will fit a 17 inch diameter wheel shout here 0207...