Cannondale quick disk break adjustment11/12/2022 ![]() That is why disc brakes are so popular for all-road bikes: Most rim brakes for wide tires offer sub-par performance. The advantages of disc brakes are most pronounced on bikes with wide tires. Thanks to the caliper’s small size, flex is not an issue. Good: A disc brake caliper only has to reach around a very thin rotor.The caliper must squeeze the rotor very, very hard to slow the bike. Bad: A disc brake’s separate rotor is much smaller (140 – 200 mm on most bikes).On a disc brake, the opposite is the case: This means that brakes for wider tires are heavier and more flexible than those for narrow tires. Bad: The brake caliper must reach around the tire.With such a long lever arm, the brake caliper does not need to squeeze the rim extremely hard to stop the bike. Good: The ‘rotor’ – the rim – is very large (close to 600 mm on most road bikes).That is true in a technical sense, but it also points out the main differences between the two types of brakes. As with many things, disc brakes have advantages and disadvantages. Whether they are right for you (and which ones to choose) depends on how you ride.Įxperts like to point out that rim brakes are in fact disc brakes – the bicycle’s rim acts as the disc rotor (above). What you’ll read here is a more detailed and differentiated view than the usual “discs offer great stopping power” generalizations. At the other end of the spectrum, I sailed through a red light on a steep Seattle street, because an early mechanical ‘road’ disc simply lacked the power to stop the bike. I remember enjoying the excellent power and modulation of the then-new SRAM Red hydraulic discs on the descent from Naches Pass, but the caliper flexed the fork blade so much that the front wheel turned right each time I braked hard. Our challenging adventures have provided excellent opportunities to learn about the advantages and disadvantages of modern ‘road’ disc brakes. Bicycle Quarterly has tested more than 20 bikes with disc brakes. Disc brakes have become increasingly popular on bicycles in recent years, especially on all-road bikes with wide tires. ![]()
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