Many people believe the small spikes on motorcycle tires are designed to prevent slipping, but that’s not actually true. These tiny spikes, technically called “vent spews,” are a by-product of the tire manufacturing process and have no impact on how the tires perform.
These vent spews, also known by names like sprue nubs, tire nibs, gate markings, or nippers, serve a specific function during production but are not related to tire grip or safety.
What Are Vent Spews?
To understand the purpose of vent spews, it helps to know a bit about how tires are made. When tires are manufactured, the rubber compound is shaped into what’s called a “green tire.” This is the basic tire shape before any markings or tread patterns are applied.
The green tire is then placed into a mold, where heat and pressure are applied. As the rubber expands, it fills the mold, forming the tread pattern and any branding or labels. However, during this process, air bubbles can get trapped between the rubber and the mold. If
This is where vent spews come in. These small holes allow excess air and pressure to escape during production, ensuring the rubber can expand fully into the mold without leaving air pockets.
Why Do Tires Still Have Spews?
Steve Burke, technical manager at Toyo Tires, explains that vent spews are created when air exits during the molding process. “Air escapes, ensuring no air bubbles form between the tire and the mold, while also carrying away small bits of rubber. That’s how vent spews are formed,” says Burke.
Most of the spews on the tread face are shaved off after production, but you’ll often notice them remaining on the shoulders and sidewalls of the tire.
Should You Remove Them?
According to Burke, vent spews serve no purpose once the tire is fully produced. Some car enthusiasts, especially those with show cars, enjoy trimming or removing them for a cleaner look. However, there’s no practical reason to remove them. If you do decide to get rid of them, avoid using scissors or blades. Instead, simply grab them with your hand and pull them off—it can even be a fun way to relieve stress!
The Bottom Line
So, those little spikes you see on new tires aren’t there to prevent slipping or improve traction. They’re just a by-product of the manufacturing process, with no real effect on the tire’s performance. Another mystery solved!
Next time you get a new set of Toyo tires, take a closer look at those vent spews—you’ll know exactly what they are and why they’re there.
