Replacement pulley for Map G2 chainguides.Mountain Racing Products is a leading supplier of components and accessories to the bicycle industry. Our brands include MRP, White Brothers, Kreitler, Tamer, and Power Grips. We manufacture the majority of our products at our facility in Grand Junction, CO, USA, in the heart of some of the best technical terrain (& product testing grounds) around. We expect the most from our products and are dedicated to providing you with the highest quality products and customer service and support that exceeds your expectations. Please feel free to contact us with any questions you may have.