Type – radial or crossply (3) L 75mph DOT mark (10) 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. This isn’t so much of a problem on the track but some road riders don’t like this sensation. In this case the “58” denotes that the tyre is rated fora maximum weight of 236kg at maximum pressure, whereas the … Thus, this tire has a side wall height of 90 percent times 130 mm or 117 mm. T 118mph Give us a shout if you have any queries on Load Index. 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). Date code (10) 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. 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. 180/55) that determines its profile. So a 120/70 16 ZR is a radial with a Z speed rating. 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. The tyre will be marked on the outside to tell you if it’s a tube-type or tubeless. Tire sizes are defined by specifications such as the type, width, aspect ratio, speed rating, tire construction type, and service description. 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. Load index (6) Apex shape and material play an important role in the way a tyre … These numbers sit in the same order on most dirt bike tires. Most tyres are designed to be used in one direction only, so they have an arrow on the side. The “17″ denotes that the tyre is 17 inches in diameter whilst “M/C” means the tyre is for a motorcycle. E marking (10) 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. The ISO Metric tire code consists of a string of letters and numbers, as follows: This is the first of two speed ratings found in the code. In this case the tyre will fit a 17 inch diameter wheel. This helps you choose your tyre thread pattern and ply. In this case the tyre will fit a 17 inch diameter wheel. The answer is neither is ‘best’, just that each is going to give you a slightly different feel. 25x8-12 tire is 8" wide) 3rd Number = The rim diameter. Brand/model/logo marks (11) (ex. 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. 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. MOTORCYCLE TYRE PARTS EXPLAINED. If it has neither of these letters, it will be a bias-ply tyre. See size chart below. Assuming of course the bigger tyre fits your smaller capacity bike. 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. The complete list of motorcycle tyre sizes offers over 400 references! Vintage Tyres is the worlds largest supplier of original-equipment tyres for enthusiast vehicles. 17. On the sidewall of any tire, you will see a string of numbers. LIKE any trade, the tyre business has its own jargon. I would guess this is because the last pair worked perfectly fine, so why would they need to know? The aspect ratio is the height of the sidewall expressed as a percentage of the width. If it has neither of these letters, it will be a bias-ply tyre. 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. K 69mph 73 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! 3 Code for tire construction (- = Bias, R = Radial, B = Bias Belted). 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