motorcycle tyre size explained

Rotation arrow (9) 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. 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. Tubeless/tube-type (8) 17. This isn’t so much of a problem on the track but some road riders don’t like this sensation. The apex is used to reinforce the sidewall and sits on top of the bead. A typical front tyre size is 120/70 17, a common rear is 180/55 17. 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. 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. Example of Tire Size Specifications In this case the tyre will fit a 17 inch diameter wheel. This next number represents the size of wheel that the tyre fits measured in inches. We explain everything you need to know here: Where can I find my vehicle’s tyre size? Sunday and Bank Holidays: Closed. If this, instead, said B or R, this would indicate a bias-belted or radial tyre, respectively. Load index (6) Tire identification diagram Tire diameter (inches) = (xxx*yy/1270)+zz, where tire size is commonly written "Pxxx/yyRzz" on the sidewall. Do you like the slower more stable feeling of a wider, less pointy tyre? 3.10. 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. "yy" is "aspect ratio" (sidewall height to tread width). "zz" is wheel diameter (inches). Alpha Coding. Here’s our quick-yet-comprehensive guide to what it all means. 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? Radial tyres have a letter ‘R’ after the speed rating. Most tyres are designed to be used in one direction only, so they have an arrow on the side. The general rule of thumb is that the wider the tyre, the wider your footprint on the road – for the most part. Brand/model/logo marks (11) The next item you’ll see is the rim size expressed in inches. If you see ‘TT’ then it is a tubetype tyre, so it must have an inner-tube. Tyre Sizing Equivalents. This is the first of two speed ratings found in the code. H 130mph © 2021 Two Tyres Ltd is registered in England No. 5 "Motorcycle" in (THIS CHART DOES NOT IMPLY EXACT COMPARISONS) TYRE CONVERSION CHART 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. As hinted to above, the pointier the tyre, the quicker it is going to feel like it wants to turn in. 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. This simply means that the tyre is suitable for motorcycle use. R 105mph Getting this wrong is an MOT fail, and can be dangerous, so do check when you buy a bike or get tyres fitted. (ex. I would guess this is because the last pair worked perfectly fine, so why would they need to know? 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. S 113mph Tire sizes are defined by specifications such as the type, width, aspect ratio, speed rating, tire construction type, and service description. Terms of Service, Disclaimer & Privacy Policy. 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). If it has neither of these letters, it will be a bias-ply tyre. These numbers sit in the same order on most dirt bike tires. 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. Read below to find out how the size and profile of the tyre can help or hinder you. Car tyre sizes explained. L 75mph Old Sizes. 2 Ratio between tire section height and nominal section width. Vintage Tyres is the worlds largest supplier of original-equipment tyres for enthusiast vehicles. 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 numbers are a two-digit week and two-digit year – so ‘2319’ would be a tyre made in week 23 of 2019. When you see ‘R’ on a tyre it means it has a radial construction. The “ (58W)” indicates the load and speed indexes of the tyre. The question is what do those numbers actually mean? 12354421 and VAT No. WHAT ARE THE DIFFERENT COMPONENTS WHICH MAKEUP YOUR TYRE? 25x8-12 tires are designed to mount on a 12" rim) Choosing the right size of tyre for your Quad. Make sure the arrow points the right way when the tyre is on the bike and moving forwards! M 81mph This has resulted in various size markings. Tyres must not be used on damaged or distorted wheels since this could result in tyre damage and deflation. 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). 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. See size chart below. These numbers are a metric designation that indicates the size of the tire and the rim that tyre is designed to go on. 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. 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. WHEELS AND RIMS. 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 load index is a two-digit number, but the permitted weight is also marked on the 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. So, like cans of beer, it’s best to use them as quickly as you can – then buy some fresh ones! 25x8-12 tire is 8" wide) 3rd Number = The rim diameter. This next number represents the size of wheel that the tyre fits measured in inches. 180/55) that determines its profile. And if you can decode the lingo, you’ll be in a much better position to work out what you need. Please leave a message outside of these hours. This is pretty simple: don’t use a front tyre on the back wheel or vice versa. How Much Lean Angle Should We Use When Cornering? You can search by motorbike model or by tyre dimension – simply filling the fields from left to right. Give us a shout here on 0207 205 2205. 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 chart gives a guide to the relationship between various size markings. 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. 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.

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