## What is Zr in motorcycle tire?

ZR basically means the tire is adapted for speeds above 149mph. ZR tires includes the speed ratings V(149mph), W(168mph) and Y(186mph). The R stands for radial.

What does Z mean on motorcycle tires?

speed rating
On a sports bike tyre these letters are usually “ZR”. The “Z” indicates the speed rating of the tyre, which in this case means it is rated above 240kph/149mph. The “R” denotes that the tyre is of radial type construction.

### What does 58W mean on a tire?

(58W) There are two parts to this as well. “58” stands for the tyre’s load index. It’s the code that says the maximum load of this tyre is 236kg at maximum inflation pressure. “W” is the tyre’s speed index, 270 km/h in this case.

How wide is a 120 70 tyre?

120mm wide
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). Easy.

## Are ZR tires better than R?

Conclusion. ZR tires were historically known as “performance-rated tires” with a speed rating of more than 149 mph while the letter R on a tire represents both the fact that it is built with a radial construction in mind and the fact that it is speed rated for 106mph.

Do I need ZR tires?

Tires with a maximum speed capability higher than 300 km/h (186 mph), require a “ZR” in the size designation. Consult the tire manufacturer for maximum speed when there is no service description.

### What does 54h mean on a motorcycle tire?

The letters (H) represent the speed rating of the tire. In this case, H means a top speed of 130 miles per hour. A typical speed chart will show J or 62mph all the way to W which is 168mph. Now… sometimes we will see a ZR in the tire size and then a different Load Rating / Speed Index label to follow.

What does 55w mean on a motorcycle tire?

Our second number, 55 here, is the aspect ratio of the tire. 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. In this example, 55% of 180 millimeters is 99 millimeters or 3.9 inches.

## What speed rating is R?

106 mph
TIRE SPEED RATINGS SAFETY

Speed Rating Maximum Speed
R Up to 106 mph
S Up to 112 mph
T Up to 118 mph
U Up to 124 mph

How wide is a 120 tire?

Tire Width Cross Reference Table

Permissible Rim Widths Metric Standard Inch
2.15, 2.50, 2.75 120 4.50
2.15, 2.50, 2.75 120 4.75
2.50, 2.75, 3.00 130 5.00
2.75, 3.00, 3.50 140 5.50

### What size Tyres do I need for my motorbike?

Your bike’s manufacturer should provide information on the maximum tyre width the bike can support. The diameter of the tyre needs to match the diameter of your wheel (for example, a 622mm rim needs a tyre with a 622mm diameter). So, you’ll need to replace your old tyre with one that has the same diameter.

Are ZR tires good for winter?

NO, the rubber will be hard as a rock at low temp, and the rubber compound is hydrophobic, vs. hydrolphilic (I may have that reversed). Summer tires are crap in the winter, winter tires are crap in the summer, all season tires are crap all the time. great post.