【Motorcycle Tire Replacement】Guide to Choosing Motorcycle Tires | Inspection & Maintenance | What Should You Do After Replacing Tires?

Motorcycle tires and private car tires are inherently different. Looking at the cross-section of a private car tire, its shape is flat. As you can imagine, when a private car tire drives over wet surfaces or standing water, it acts like a flat plate sliding across the ground. Without tire treads to channel the water backward and to the sides, "aquaplaning" will occur. This means a water film lifts the entire tire, causing it to lose grip and slip.

In contrast, the cross-section of a motorcycle tire is semi-circular. When it rotates, it inherently possesses "water-breaking" capability. Much like the bow of a boat cutting through the water's surface, water is naturally diverted to both sides. Therefore, motorcycle tires do not need to rely heavily on a large number of treads for drainage like private car tires do.

Additionally, when a motorcycle turns, the vehicle body leans, requiring the sides of the tire (the tire shoulders) to make contact with the ground. As a result, motorcycle tires generally have fewer treads—or even none at all—closer to the edges. This is designed to maximize the contact patch and increase grip during cornering.

There are many types of motorcycles, and the size and appearance used by different models vary significantly, but the way specifications are expressed remains the same. Taking the tire specification 180/55 ZR 17 as an example, it can be interpreted as:

• 180: Section width（in mm）

• 55: Aspect ratio（the percentage of tire height relative to tire width, i.e.180 x 55%）

• ZR / R / -: Construction code（R or ZR represents Radial tires; - or B represents Bias/Belted Bias tires）

• 17: Rim diameter（in inches）

Different types of motorcycles have different tire designs. Let's take a look at the tire characteristics of different types of motorcycles.

Visual Inspection

Roll the motorcycle forward and backward to check the tread for embedded pebbles, nails, glass, or punctures. If you spot a suspected tiny hole, you can apply soapy water to it; if bubbles appear, there is a high probability of an air leak. If you find that a nail or screw has already pierced the tire, do not pull it out, as doing so will cause the remaining air to escape completely. If the tire still holds a certain amount of pressure (or after pumping in a little air), ride to a tire repair shop under safe conditions.

Checking Tire Pressure

Measure the tire pressure when the tires are cold at least once a week or before heading out. Motorcycle tires are relatively soft and are heavily affected by temperature (the difference can be 1 to 2 PSI between summer and winter). Incorrect tire pressure will severely impact tire lifespan and riding safety.

Wear and Tear Level

According to Hong Kong law, the tire tread must be at least 1 mm deep and must cover three-quarters of the entire tread width. Additionally, you can check the "Tread Wear Indicator" (TWI) inside the tire grooves. Locate the triangular mark on the sidewall of the tire, follow where it points into the tread groove, and you will see a slightly raised rubber bump. When the tread wears down to the same level as this bump, it means the tire has reached the end of its lifespan and must be replaced.

Year of Production

Check the 4-digit number on the tire sidewall (for example, 1625 represents production in the 16th week of 2025). Generally, it is recommended to replace tires every 10,000 to 20,000 kilometers or every 2 years, while touring/cruiser tires are recommended for replacement every 3 years. Even if there is still visible tread, the rubber will age over time, causing its grip performance to decline.

Cleaning Tires

It is best to clean the tires weekly using fresh water, car wash shampoo, and a soft-bristled brush. Some tire shines can draw out the chemical oils inside the rubber, accelerating tire cracking, so it is better to use them sparingly. If the tires come into contact with gasoline, brake fluid, or chain lubricant, they must be washed off immediately.

The surface of a brand-new motorcycle tire leaves behind a layer of mold-release agent. If you engage in aggressive driving right after replacing a new motorcycle tire without breaking it in, it is highly prone to slipping on wet and slippery roads. Therefore, it is strongly recommended to ride about 100 kilometers on new tires, allowing the heat generated by the tire to strip away the mold-release agent on the surface. This process is commonly known as "scrubbing in" or "breaking in" the tire. However, while riding, there is no need to intentionally lean hard into corners to scrub the tires; simply ride normally and gently, progressively increasing the lean angle, while paying extra attention when riding through wet surfaces.

It is particularly worth mentioning that after replacing with brand-new tires, the motorcycle's agility will improve significantly, and you may even feel that the steering has become very sensitive. This is a normal physical phenomenon, so you may need to re-adapt to the bike's dynamic response after a tire change.