Brake rotors / discs

Brake rotors are a central component of disc brakes on a bicycle, providing effective deceleration by converting the kinetic energy of the wheel into heat. These rotors, also called discs, are mounted on the hub of the wheel and used in conjunction with calipers and brake pads to produce consistent and reliable braking force. The choice of the right brake rotor depends on various factors, such as riding style, terrain, and the specific requirements of the bicycle.

Brake rotors come in different sizes, usually ranging between 140mm and 203mm in diameter. Smaller rotors, such as the 140mm variant, are lighter and provide sufficient braking power for lighter riders or less demanding road rides. Larger discs, such as 180mm or even 203mm, offer enhanced braking power, particularly on steep descents and off-road conditions, as they dissipate heat better, reducing the risk of overheating.

Another distinguishing feature is the material. Most brake rotors are made of stainless steel, as this material is both durable and resistant to heat and corrosion. High-quality models often use a mix of materials or have a special coating that further improves heat dissipation. There are also "two-piece" brake rotors, where the rotor is made of stainless steel, but the carrier is aluminum, reducing overall weight while enhancing cooling.

An important detail when choosing the right brake rotor is the mounting system. There are two common systems: the six-bolt mounting and the Center-Lock system by Shimano. Both have their pros and cons, with Center-Lock generally offering easier installation.

Ultimately, it's essential to maintain brake rotors regularly and replace them when excessively worn to ensure the safety and performance of the bicycle.

Important manufacturers of brake rotors for disc brakes include: Shimano, TRP, Swissstop, Campagnolo, MAGURA, Rohloff, Hayes, Jagwire, Tektro, and Avid.