Jagwire Pro LR1 Disc Brake Rotor 180mm Jagwire’s LR1 Pro Lightweight Rotors are a stylish way to upgrade the performance on your bike. Utilizing a 2-piece construction, they feature a separate aluminum spider and stainless steel brake track. The steel braking surface delivers quiet, consistent performance while the spider helps reduce rotating weight by about 15% compared to a traditional single-piece rotor. This listing is for the pair.