Wheel that is misaligned in the dropout - loosen and re-seatĪfter verifying that the wheel is properly seated, it’s okay to start truing the rotor, but it’s always good to know other things that lead to rotor rub: The edges can be sharp, and when they rotate it can have quite the slicing effect. When a rotor is deformed past a certain point, you can push it around, but it will never be straight.ĬAUTION: Anytime you are working around rotors, be careful. ![]() If ever in doubt, replace with a new one. A good rule of thumb: if the rotor does not show improvement within a few minutes of attempting repair, it has probably reached the end of its lifespan. It can be tricky to determine whether a rotor is repairable. If a rotor has been badly bent, especially from impact, it’s best to simply replace it. It is even possible for new rotors to have some problems. ![]() ![]() One of the most common causes of a bent rotor is from a direct impact when parking or storing the bike. Rotors can become warped from use, abuse or simply by getting too hot. For the highest level of accuracy, a dial indicator: DT-3i.2.A flashlight is useful, but even a white sheet of paper held behind the caliper can help make lateral deviations, also called runout, visible as the rotor spins.
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