Skip to content Skip to sidebar Skip to footer

Bicycle Disc Brake Rotor Size Chart

Bicycle Disc Brake Rotor Size Chart

If you're looking to upgrade your bike's disc brake rotors or simply need to replace worn-out ones, you'll need to know the right size to get. The size of a disc brake rotor refers to its diameter, which can range from as small as 140mm to as large as 220mm. In this article, we'll go over the different sizes of disc brake rotors and how to choose the right one for your bike.

What is a Disc Brake Rotor?

Disc Brake Rotor

A disc brake rotor is the circular metal component that attaches to the wheel hub and provides a surface for the brake pads to grip onto when stopping the bike. When the brake lever is squeezed, hydraulic or cable actuated calipers squeeze the brake pads onto the rotor, creating friction and slowing down the bike.

Disc Brake Rotor Sizes

Disc Brake Rotor Sizes

Disc brake rotors come in various sizes, typically ranging from 140mm to 220mm in diameter. The size of the rotor you need will depend on the type of riding you do and the type of bike you have.

Road Bikes

Road Bike

On road bikes, disc brake rotors are typically smaller than those found on mountain bikes, with most rotors measuring between 140mm and 160mm in diameter. This is because road bikes generally require less stopping power than mountain bikes, and smaller rotors are lighter and more aerodynamic.

Mountain Bikes

Mountain Bike

Mountain bikes, on the other hand, require more stopping power due to the rough terrain they're ridden on. As a result, larger disc brake rotors are typically used on mountain bikes, with sizes ranging from 160mm to 220mm in diameter. Larger rotors offer more surface area for the brake pads to grip onto, resulting in better stopping power.

Gravel and Cyclocross Bikes

Cyclocross Bike

Gravel and cyclocross bikes are a hybrid between road and mountain bikes and can use a variety of disc brake rotor sizes. The size of the rotor you need will depend on the type of terrain you're riding on and your personal preference.

How to Choose the Right Size

Choosing The Right Size

When choosing the right size disc brake rotor for your bike, there are a few things to consider:

Bike Type

As mentioned earlier, the type of bike you have will determine the size of the disc brake rotor you need. Make sure to check your bike's specifications or consult with a bike mechanic to determine the correct size.

Riding Style

If you ride aggressively or on steep terrain, you may want to consider using a larger disc brake rotor for more stopping power. However, if you prioritize weight and aerodynamics, a smaller rotor may be a better choice.

Compatibility

Make sure the disc brake rotor you choose is compatible with your bike's brake calipers and wheel hub. Some rotors are designed specifically for certain types of brakes or hubs, so be sure to double-check before making a purchase.

Conclusion

Choosing the right size disc brake rotor for your bike is an important decision that can affect your bike's performance and safety. Consider the type of bike you have, your riding style, and compatibility when selecting a disc brake rotor. With the right size rotor, you'll be able to stop confidently and safely on any terrain.

Related video of Bicycle Disc Brake Rotor Size Chart