You’ll achieve exceptional braking performance with the right rotor. Check the conditions that arise from your bike, your riding style and your weight to create your ideal braking system. Proper maintenance and correct braking are just as important as choosing the right rotor. We’ll explain what you need to know.
Assuming the same manual force, a brake disc with a diameter of 203 mm generates about 10% more braking force than one with a diameter of 180 mm, and a rotor´s force increase by 20%. By selecting the right diameter you can reduce the demand on arm strength, prevent brake fading and gain added safety.
A larger rotor means greater braking force due to its larger lever. However, this is only true if you also take the rider’s weight into consideration. If a rider weighs less than 70 kg, large rotors will make it difficult to create sufficient temperature to develop the greatest braking force. Only when the rotor and the pad are at the right temperature can they achieve the best possible friction values. A larger rotor is more heat resistant, which also helps prevent fading, i.e., a drop in friction between the pad and the rotor.
A brake is a complex system in which each individual part significantly influences the overall result. A larger rotor can affect the braking feel at the lever blade just as much as the brake lever itself, which you would probably understand faster if you were looking for why you’re struggling with arm pump. So it’s worth putting a little more effort into it and getting the best out of the rotor as well. A larger rotor means you need less force to achieve the same braking power, saving the effort you make with your hands and arms.
Always choose the rotor that matches your brake system. If it’s too thin, the brake pistons can tilt in use, and a defect will occur. MAGURA recommends 1.8 mm-thick rotors for the MT A2 disc brake and 2 mm-thick rotors for all other MT & LOUISE disc brakes. We recommend 2.5 mm for GUSTAV brakes.
Running in a new rotor is just as important as running in new brake pads. When one component of two is new, both have to get used to each other again. Small imperfections are evened out, optimizing the friction surface. Running in also releases small amounts of gas from the brake pad and loosens residue from the production process. The pad and rotor need to be run in to achieve a perfect match, after which they’ll give you the best possible performance and have a long lifetime.
The best way to run in your pads is to find a flat track and brake roughly 30 times from 30 km/h. Brake gently but firmly, until you come to a standstill. To keep your brake in tip-top condition, repeat the running-in process at regular intervals depending on the type of route. Just remember that larger rotor diameters also require a longer running-in process.
Did you know that there is no performance difference between one-piece and two-piece brake discs per se? The coefficient of friction and the braking power are identical. A big advantage of the two-piece washers is the riveting, which gives more room for thermal expansion. As a result, there is less thermal distortion of the pane and they are less prone to squeaking. In addition, a lightweight aluminum inner ring can reduce the weight of the disc.
Are your brakes noisy, or do they need longer to bring the bike to a standstill? Cleaners or lubricants are often to blame. Only use suitable brake cleaners or water to clean your rotor, and don’t touch the rotor when you’re oiling or greasing your chain.
Fantastic brake power with minimum weight. Optimized for the Cross Country use.
The low-weight rotor for high braking force and good heat resistance. This rotor is particularly versatile.
The rotor with a high braking force and excellent heat resistance for prolonged braking and high system weights. A stiffening ring also makes the MDR-C extremely vibration-resistant and quiet.
The new MDR-S 2.0 offers high braking power and good heat resistance at a moderate weight. A new friction ring design reduces vibrations when braking. Perfect for ambitious enduro and downhill use and for safe performance in the city.
The rotor with the highest possible braking force and heat resistance for prolonged braking and high system weights. Thanks to its two-piece design, it has only a moderate weight and is exceptionally vibration-resistant.
The Gustav PRO brake disc. The new MDR-S vibrates Thanks to an optimised friction ring design and the increased rigidity of a 2.5 mm rotor, the new MDR-S vibrates noticeably less frequently and therefore generates less noise. In addition, the increased mass offers unprecedented stability during long braking or high masses.
MAGURA offers three specific MDR-A rotors with a thickness of 1.8 mm for the MT A disc brake. These models are NOT compatible with the MT disc brakes.
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