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On the sidewall of any tire, you will see a string of numbers. 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. Firms work hard on the graphic design of the logo and the like too, to make the sidewall as pretty as they can. This simply means that the tyre is suitable for motorcycle use. 3.10. It is essential that the wheel size and type is a suitable fitment for the tyre and motorcycle concerned (table). The forces going through a tyre get very serious as speeds increase, so they have a maximum speed rating. Here’s a primer on how to decipher which tire size … 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. 25x8-12 tires are designed to mount on a 12" rim) Choosing the right size of tyre for your Quad. 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. E marking (10) A 180/60 tyre for example is going to give you a quicker turn rate over a 180/55. The number portion of the characters in brackets represent the load index of the tyre, which specifies the maximum load the tyre can carry. The arrow usually has ‘front’ or ‘rear’ written in it, so you know which end to put it on! Load index (6) Vintage Tyres is the worlds largest supplier of original-equipment tyres for enthusiast vehicles. WHAT ARE THE DIFFERENT COMPONENTS WHICH MAKEUP YOUR TYRE? As hinted to above, the pointier the tyre, the quicker it is going to feel like it wants to turn in. Only you can really decide which size and profile of tyre is best. 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). 17. Remember the weight allowed is per tyre. M/C. 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. Saturday: Closed during lockdown S 113mph The “17” denotes that the tyre is 17 inches in diameter whilst “M/C” means the tyre is for a motorcycle. Do tyre sizes confuse you? Q 100mph In addition to tires, Bridgestone manufactures diversified products, which include industrial … 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. 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. Brand/model/logo marks (11) 4 Nominal rim diameter size in inches. Check the load you’ll be carrying, with pillion and luggage if relevant. No, we’re not talking about the owner’s manual under the seat (though that does have some good info in there). (ex. 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? 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). When you see ‘R’ on a tyre it means it has a radial construction. 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 … And if you can decode the lingo, you’ll be in a much better position to work out what you need. 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. This next number represents the size of wheel that the tyre fits measured in inches. In this case the tyre will fit a 17 inch diameter wheel. P 95mph The next item you’ll see is the rim size expressed in inches. However, some manufacturers such as Bridgestone and Dunlop are known to be more pointy than other brands like Metzeler and Pirelli. The letters are then followed by the wheel rim size which is expressed in inches. 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 … In this example then, the height of the tyre is 55% of 180mm, which equates to 99mm. If this, instead, said B or R, this would indicate a bias-belted or radial tyre, respectively. L 75mph The apex is used to reinforce the sidewall and sits on top of the bead. 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. This ratio is not indicated when section width is expressed in inches (eg. V 149mph Old Sizes. These numbers sit in the same order on most dirt bike tires. Monday to Friday: 8:30am to 5:00pm There can sometimes be extra letters after this. The tyre will be marked on the outside to tell you if it’s a tube-type or tubeless. Terms of Service, Disclaimer & Privacy Policy. • As ever – we’re ready and waiting to help you with any queries at all! Once you have selected the right tyre size, you will find all … The ISO Metric tire code consists of a string of letters and numbers, as follows: 5 "Motorcycle" in The ‘W’ in brackets is the second speed rating found on the tyre. The downside to a pointy tyre is that it will feel more unstable going in a straight line and almost twitchy. Z Over 150mph. 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. In this case the “58” denotes that the tyre is rated fora maximum weight of 236kg at maximum pressure, whereas the … Example of Tire Size Specifications If it has neither of these letters, it will be a bias-ply tyre. 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). Give us a shout here on 0207 205 2205. M 81mph Rotation arrow (9) Date code (10) If it has neither of these letters, it will be a bias-ply tyre. DOT mark (10) The complete list of motorcycle tyre sizes offers over 400 references! The “17″ denotes that the tyre is 17 inches in diameter whilst “M/C” means the tyre is for a motorcycle. 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. © 2021 Two Tyres Ltd is registered in England No. Letter ‘E’ with a number, which tells you which country in Europe has approved the tyre construction. Easy. Apex shape and material play an important role in the way a tyre … Tyre Sizing Equivalents. People still fit them and get on just fine, but it’s not always recommended. In this case the tyre will fit a 17 inch diameter wheel. Motorcycle tyre marking and size. Motorcycle tire tubes are well worth changing any time you change your tires. Motorcycle-standard tyres found at Vintage Tyres. The numbers are a two-digit week and two-digit year – so ‘2319’ would be a tyre made in week 23 of 2019. That’s everything in the code explained, but what do the different sizes and profiles of tyre do for you as a rider? LIKE any trade, the tyre business has its own jargon. Bridgestone Corporation is the world's largest tire and rubber company. This next number represents the size of wheel that the tyre fits measured in inches. Crossply tyres are an older technology, which uses different arrangements of ‘plies’ or material which cross over each other under the tyre tread. And if you can decode the lingo, you’ll be in a much better position to work out what you need. MOTORCYCLE TYRE PARTS EXPLAINED. The answer is neither is ‘best’, just that each is going to give you a slightly different feel. Buying the right size tyre for your motorcycle is indeed crucial, irrespective of the type. Type – radial or crossply (3) 180/55) that determines its profile. Note, "xxx" is tread width in mm. 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. SIZING (1,2 and 4 on our pic) (ex. 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. Car tyre sizes explained. T 118mph Firstly you need to have a good idea what surface and what your quad will predominantly used for Sport, Farm, Road. 73 Thus, this tire has a side wall height of 90 percent times 130 mm or 117 mm. Tyres must not be used on damaged or distorted wheels since this could result in tyre damage and deflation. 80/90. 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): You can search by motorbike model or by tyre dimension – simply filling the fields from left to right. 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. If you see ‘TT’ then it is a tubetype tyre, so it must have an inner-tube. GB343789562. 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. Crossply tyres generally have taller sidewalls and are more suited to older bikes, commuter and off-road machines. 2 Ratio between tire section height and nominal section width. So a 120/70 16 ZR is a radial with a Z speed rating. To find what weight this number corresponds to you will need to refer to a load index table. 25x8-12 tire is 8" wide) 3rd Number = The rim diameter. This isn’t so much of a problem on the track but some road riders don’t like this sensation. Once completed we give you the best recommendations for tyres. This simply means that the tyre is suitable for motorcycle use. This is pretty simple: don’t use a front tyre on the back wheel or vice versa. Here’s a list of the speed ratings: J 62mph Read below to find out how the size and profile of the tyre can help or hinder you. 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. M/C obviously stands for motorcycle. Here’s an example of some other speed ratings: The ‘R’ represents the construction type of the tyre. How Much Lean Angle Should We Use When Cornering? 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. Assuming of course the bigger tyre fits your smaller capacity bike. Were this tire a radial, we would see a … We explain everything you need to know here: Where can I find my vehicle’s tyre size? As you can see, the number 73 means the tyre can carry a load up to 365kg. U 125mph Getting this wrong is an MOT fail, and can be dangerous, so do check when you buy a bike or get tyres fitted. So tube-type rims need to be used with an inner tube – but you can use either a tube-type or tubeless 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. This system measures the size in millimeters. H 130mph There are two organizations, Tire and Rim Association (TRA), and European Tyre and Rim Technical Organisation (ETRTO), that influence tire standards. LIKE any trade, the tyre business has its own jargon. The aspect ratio is the height of the sidewall expressed as a percentage of the width. "yy" is "aspect ratio" (sidewall height to tread width). 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. WHEELS AND RIMS. Sunday and Bank Holidays: Closed. 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. (THIS CHART DOES NOT IMPLY EXACT COMPARISONS) TYRE CONVERSION CHART How Dirt Bike Tire Sizes Work: Breaking Down Numbers. 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. 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. These numbers are a metric designation that indicates the size of the tire and the rim that tyre is designed to go on. Please leave a message outside of these hours. A typical front tyre size is 120/70 17, a common rear is 180/55 17. APEX. It is the most commonly used system for motorcycle tires, which is a set of three numbers and letters … Available from £21.6 to £214.8. 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. Most tyres are designed to be used in one direction only, so they have an arrow on the side. TL means it is a tubeless tyre. Country of Construction (12) Motorcycle tyres are manufactured in a number of different countries with differing requirements in terms of load, dimensions and speed ratings. This improves performance over non-belted, bias-ply tyres (also called cross-ply). The “ (58W)” indicates the load and speed indexes of the tyre. In this case it’s a 17-inch wheel. Low-Profile Equivalent. 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. Share Tweet. Regardless of which manufacturer made the tyre, its size is indicated on the tyre … 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. 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. MOTORCYCLE TYRE MARKINGS: THE WRITING’S ON THE WALL!! Put simply, the load you put on a tyre has an effect on its maximum capable speed. 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. 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. 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. You’re not alone – the average person doesn’t know what size tyres are fitted to their vehicle. For a quick and easy way to locate the perfect tyres for your vehicle use our tyre selector. W 168mph The choice here depends on your wheels. Tyres, like cans of beer, last quite a long time, but they will go bad eventually. Tubeless/tube-type (8) Motorcycle Tyre Sizes Explained. No matter how cool your matt black retro Bobber Brat Scrambler Rat creation looks with a 200-section rear tyre squashed onto the front. However it doesn’t tell us the maximum tolerable speed for the tyre; that comes later in the code in brackets. I would guess this is because the last pair worked perfectly fine, so why would they need to know? "zz" is wheel diameter (inches). Radial tyres have a letter ‘R’ after the speed rating. Give us a shout if you have any queries on Load Index. Let’s take a typical dirt bike tire size and break the numbers down, one by one. K 69mph 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. Deciphering motorcycle tyre codes. 3 Code for tire construction (- = Bias, R = Radial, B = Bias Belted). This has resulted in various size markings. Understand these numbers, letters and symbols, and you’ll be well on the way to being a tyre genius. The second number indicates the aspect ratio (or height) of the tyre. Do you like the slower more stable feeling of a wider, less pointy tyre? Here’s our quick-yet-comprehensive guide to what it all means. 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!! 3.50-18). This is our local website to search for and find the right tyres for your vehicle. MH90. That’s your motorcycle tyre sizes and profiles explained. Tire sizes are defined by specifications such as the type, width, aspect ratio, speed rating, tire construction type, and service description. This helps you choose your tyre thread pattern and ply. The general rule of thumb is that the wider the tyre, the wider your footprint on the road – for the most part. Alpha Coding. The question is what do those numbers actually mean? And why not?!?! 17. 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. This next number represents the size of wheel that the tyre fits measured in inches. This is the first of two speed ratings found in the code. It’s literally a rolling advert for the maker, so they stamp the model and their name as big as possible on there. 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 … 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. Tire identification diagram Tire diameter (inches) = (xxx*yy/1270)+zz, where tire size is commonly written "Pxxx/yyRzz" on the sidewall. Motorcycle Tire Size Meaning Explained Metric System. That’s a simple one! It indicates what speed the tyre is capable of being taken over. Speed rating (7) You often see the question coming up, which is best out of a 180 vs 190, or 190 vs 200 width tyre? 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. 2.50/2.75. See size chart below. In this case the tyre will fit a So, like cans of beer, it’s best to use them as quickly as you can – then buy some fresh ones! There are a lot of dirt bike tire sizes available to motocross and off-road riders. R 105mph The load index is a two-digit number, but the permitted weight is also marked on the tyre. Make sure the arrow points the right way when the tyre is on the bike and moving forwards! Generally it is the width and height of a tyre (e.g. This is represented as a percentage of the width of the tyre. If it has neither of these letters, it will be a bias-ply tyre. 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. 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! 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. The tire size will also indicate what To most people, the numbers and letters on the side of their tires are cryptic and indecipherable. 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. 12354421 and VAT No. In this example ‘Z’ means that the tyre is suitable for speeds over 149mph. This chart gives a guide to the relationship between various size markings. On how to decipher which tire size … see size chart below Dunlop are known be! 205 2205 other speed ratings found in the same order on most dirt bike tire sizes work: Breaking numbers! 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