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Why Harley Performance Rotors Are Better Than Standard Rotors

by | Mar 5, 2024 | Motorcycle Performance, Rotors

Performance rotors have five distinct advantages over the standard rotors that come with your Harley from stopping power to durability. Learn about the different types of motorcycle rotors on the market and view ten frequently asked questions about Harleys and performance upgrades, answered.

What Do Rotors Have To Do With Motorcycle Performance?

Motorcycle rotors, aka brake discs or brake rotors, are probably not the first thing that comes to mind when you think of making your Harley faster and higher performing. In fact, the job of motorcycle rotors is the exact opposite, to make you slow down. But there’s a difference between Harley’s standard rotors and high-performance rotors.

There are various types of Harley motorcycle rotors, and the choice depends on your preferences, riding style, and the bike’s intended use. But if you’re looking for a better ride, performance parts are always a choice that never disappoints.

To understand why, let’s look at the types of motorcycle rotors, what makes a rotor a high-performance rotor, and why Harley performance rotors are better than standard rotors.

5 Common Types of Motorcycle Rotors

  1. Solid Rotors: Basic, one-piece rotors made from a solid piece of metal. They are simple and cost-effective, commonly found on entry-level and commuter motorcycles.
  2. Vented Rotors: The next step up is vented rotors, which have channels or holes in them to improve heat dissipation. The vents help to reduce brake fade by dissipating heat more efficiently, making them suitable for more demanding riding conditions.
  3. Drilled Rotors: Holes drilled into the rotor aid in heat dissipation and water dispersion. They are often used in high-performance motorcycles and enhance braking performance, especially in wet conditions.
  4. Slotted Rotors: Shallow slots machined into the disc surface help maintain a clean contact surface for the brake pads, prevent glazing, and improve brake performance.
  5. Floating Rotors: There are two parts to floating rotors, a center hub and an outer rotor ring. The floating design allows for better heat expansion and contraction, reducing the risk of warping. Floating rotors are often found in high-performance and sport motorcycles.
F9 solid motorcycle rotor in black

Standard vs Performance Harley Rotors

For everyday commuting or casual riding (though arguably Harley riders are not casual riders), standard solid rotors are fine. The solid rotor is also better for use in cooler climates (and there, as we shall see, high-performance solid rotors). If you race your Harley or push it to the limits, though, you definitely want high-performance motorcycle rotors.

RaceSpec 11.5" floating rotor with wave ring black

5 Advantages of High-Performance Rotors

The five advantages of performance rotors for your motorcycle:

  1. Better Heat Dissipation: High-performance rotors are designed with advanced materials and construction to dissipate heat more effectively. This is crucial for reducing brake fade during intense or prolonged braking.
  2. Reduced Weight: Some high-performance rotors use lightweight materials like carbon-ceramic composites or aluminum, reducing unsprung weight and enhancing overall performance.
  3. Improved Stopping Power: Provide better bite and responsiveness, improving the overall braking performance of your Harley-Davidson.
  4. Enhanced Durability: Materials used in high-performance rotors are better able to withstand higher temperatures and stress without warping or deteriorating.
  5. Design: High-performance motorcycle rotors may feature specific designs, such as the drilled or slotted patterns discussed above, to optimize braking efficiency and reduce the risk of brake pad glazing.

SMT Sets The Bar With Their PR-1 Rotors

SMT’s PR-1 rotors are designed to offer Harley riders the best performance and smoothest braking possible. Our motorcycle racing rotors are currently available in 11.5″, 11.8″, and 13″ with two choices of braking surfaces (vented and non-vented) to fit your particular riding environment. Plus, single or dual discs.

If you’re racing where temps are high and you experience hard braking, choose the vented PR-1 rotor. The vented braking surface helps cool your rotor surface and cool your entire braking system. Hot rotors result in a hot fluid resulting in brake fade, which you definitely do not want on a racetrack.

If you are racing primarily in cooler weather, consider the solid non-vented PR-1 rotor your better option, as a too-cold rotor is just as bad as a too-hot rotor.

The PR-1 rotor is manufactured from lightweight 420 stainless steel. There is an aluminum center option for further weight reduction, as well as additional heat displacement. For a distinctive look, the PR-1 high-performance rotor is also available in three finishes (black, polished, and unfinished so you can paint it any color you want).

SNAP Financing

FAQs About Performance Harleys & Rotors

  1. What is the purpose of motorcycle rotors? Motorcycle rotors, also known as brake discs, work in conjunction with brake calipers and pads to slow down and stop the motorcycle by converting kinetic energy into heat.
  2. What are standard motorcycle rotors? Standard motorcycle rotors are the stock or factory-installed brake discs that come with the motorcycle. They are designed to meet the basic braking needs of the bike and provide satisfactory performance under normal riding conditions.
  3. How do higher-performance motorcycle rotors differ from standard motorcycle rotors? Higher-performance motorcycle rotors are engineered to deliver superior braking performance. They may feature advanced materials, improved heat dissipation, and enhanced design for better-stopping power, reduced brake fade, and overall improved performance under demanding riding conditions.
  4. What materials are commonly used in motorcycle rotors? Motorcycle rotors are often made from cast iron, stainless steel, or a composite of both. Some high-performance rotors may also incorporate lightweight materials such as carbon fiber, stainless steel, aluminum, or ceramic to reduce weight and improve heat dissipation.
  5. Do higher-performance rotors improve stopping power? Yes. Higher-performance rotors improve stopping power with better heat dissipation and reduced brake fade. This is particularly beneficial for Harley riders who favor aggressive or track riding.
  6. Are there any drawbacks to using higher-performance rotors? High-performance motorcycle rotors are generally more expensive than standard rotors, though the higher cost is what you are paying for to get higher performance. Some high-performance rotor materials may require more careful maintenance and, in certain cases, may not be as durable for everyday commuting as standard rotors.
  7. Can I upgrade my Harley motorcycle with higher performance rotors? Yes, but it’s essential to ensure compatibility with your Harley’s brake system. SMT PR-1 high-performance rotors are made to fit any Harley motorcycle.
  8. How do I know when it’s time to replace my Harley motorcycle rotors? Signs of worn or damaged rotors include vibrations during braking, reduced braking performance, uneven wear, or visible cracks. Regularly inspect your rotors during routine maintenance; if you notice any of these signs, replace the rotors promptly.
  9. Do motorcycle rotors come in different sizes? Yes, motorcycle rotors come in various sizes to fit different makes and models. It’s important to choose rotors that are compatible with your specific Harley motorcycle to ensure proper fitment and functionality.
  10. Are there specific maintenance requirements for high-performance rotors? Maintenance requirements vary depending on the materials used for the high-performance rotor. Some high-performance rotors may require more frequent inspections, and it’s essential to follow the manufacturer’s recommendations for cleaning and maintenance to ensure optimal performance and longevity.