Aerospace Cycling

All answers for Motorcycle



Quick Answer: What Do The Letters Mean On Motorcycle Tires

The first number is the tire’s width in millimeters; the second represents the tire’s aspect ratio, which describes the tire’s sidewall height as a percentage of its width. In this case we have a tire that’s 130mm wide and 70mm high. R means this tire’s radial, and 17 tells us it fits a 17-inch rim.

What does the B stand for on a motorcycle tire?

This is identifying the manner in which the tire was constructed, radial, bias belted, or standard bias/cross ply. Obviously, “R” stands for radial and the “B” stands for bias-belted. If there is no letter between the aspect ratio and rim size that means the tire is just a standard bias ply tire/cross ply tire.

What does the M mean on motorcycle tires?

Alphabetical tire codes will look something like this: M T 90 – 16 Load Range B. And here’s how to read an alpha code: M = vehicle designation (motorcycle) T = tire width code (see Converting Between Sizing Systems for the physical meaning of this).

What does the S or R mean on tires?

R indicates the construction used within the tires casing. R stands for radial construction. B means belted bias and D stands for diagonal bias construction. Each letter coincides to the maximum speed a tire can sustain under its recommended load capacity. For instance, S is equivalent to a maximum speed of 112 mph.

What does 74 h mean on a motorcycle tire?

For example, a tire with the sizing MT90B16 74H has a load index of 74 and a speed rating of H (130 mph). Note: Newer tires that have a width of 150+mm will only use metric sizing. When the alphanumeric system was created, motorcycle tires didn’t get much bigger than an MV85 (150mm).

What speed rating is R?

106 mph Speed Rating Maximum Speed Q Up to 100 mph R Up to 106 mph S Up to 112 mph T Up to 118 mph.

What does TL TT mean on Tyres?

TT stands for Tubetype, and TL stands for Tubeless. If the tyre has both markings – TT/TL – then it is suitable for either wheel rim type, but of course you would still need an inner tube on a Tubetype wheel rim.

Are Shinko tires any good?

Shinko tires may not have the latest in motorcycle tire technology compared to larger brands like Michelin or Dunlop, but they do offer pretty decent quality at much more affordable prices. If you want the best tires available, you’ll probably look elsewhere, but if you want good value, Shinko tires are a good option.

What does M’s mean on tires?

149. All-Season Tires with Mud and Snow Designation. When a tire has M+S on it, that means that it meets the Rubber Manufacturers Association (RMA) guidelines for a mud and snow tire.

What are H and V-rated tires?

The letters “H” and “V” represent speed ratings. The rating is the speed the tire has been tested to for continuous safe driving. The English equivalent speed for H-rated tires is 130 mph and V-rated tires are good for up to 149 mph.

Can I use ZR tires instead of R?

The Z in ZR corresponds to an old label used by manufacturers to indicate that the speed index is higher than V, i.e. 150 mph. Thus, a ZR tyre has a speed index of V, W, or Y. There is therefore no difference between a ZR or an R tyre with the same speed index.

What does H or V speed rating mean?

Identification. H-rated tires are rated for a maximum speed of 130 mph. The V rating is the next rating faster, and V-rated tires are good to 149 mph. Both H- and V-rated tires are considered to be performance-touring tires.

What does 55 W mean on motorcycle tires?

This means that the tire’s measurement from inside the bead (which sits inside the wheel rim holding the tire within it) to the top of the tire is 55% of the tire’s width.

How do you read a DOT tire date code?

Remember that the last four digits of the code are the date the tire was manufactured. You can check the first two digits of the DOT code to know the week of the manufacturing. The last two digits will reveal the manufacturing year. For instance, when it was written in 0203, the manufacturing year was 2003.

What does 69 W mean on a tire?

This number represents the tire’s load carrying maximum capacity at maximum pressure. The load rating is found after the tire size. Example. 160/60R-17 (69W). So this tires load rating would be 716 lbs or 324 kg.

What happens if you go faster than tire speed rating?

Some of those states acted without consulting the tire industry. Safety advocates and tire experts say that habitually driving faster than a tire’s rated speed can generate excessive heat that damages the rubber, with potentially catastrophic results.

What is Load Range E?

The load range is identified by a letter of the alphabet, usually from A to F, which represents the ply rating and load pressure. A rating of “E” on the tire means the tire has a ply rating 10 and a load pressure of 80 psi.

What do the numbers and letters on tires mean?

The number is the load rating, or the amount of weight that it can handle. The letter is the speed rating, or the maximum speed the tire is built for. Consult a load and speed index to find out what your tire’s specific rating means.

What is TT and LT?

Apart from structure (radial or diagonal), size and profile, tyres can also be distinguished by whether they are TT (tube type) or TL (tube less) tyres. In this case, the former features an inner tube while the latter does not.

What is the difference between TT and TL tyres?

A tubeless tyre is one where there is no inner tube between the tyre and the rim. Air is directly held in the space between the tyre and the rim. A tube-type tyre has an inflatable tube in it that holds the air in the tyre.

What are tubed tyres?

Answers: Tube tyres are those tyres with a valve and rim. Tube tyres have an inner tube in between the rim and the tyre. It’s this tube which has the air filled in it. When the tyre is punctured, it’s the tube which loses air immediately and the tyre goes flat. This tube is doughnut-shaped and made of rubber.