Jagwire Pro LR2-E Ebike Disc Brake Rotor Magnet Jagwire LR2-E e Bike Disc Brake Rotors feature an integrated magnet for use with E-bike speed sensors. Features2-piece design features an aluminum spider and a separate stainless steel brake track Stainless steel machined braking surface resists corrosion and is tuned to reduce braking noise Aluminum spider features an integrated concentric ring and reinforced rivet joints to resist warping and improve durability For rear wheel use on E-bikes with dropout-mounted speed sensors Compatible with all popular disc brake pad compounds (organic/resin metallic and semi-metallic)NOTE LR2-E rotors are NOT compatible with brakes with pads that extend below the caliper body. Examples include Avid BB7 Avid Juicy Hayes HFX and Hayes MX1 | Jagwire | Pro Lr2-E Ebike Disc Brake Rotor Magnet 180Mm, 6-Bolt