Replacement pulley for Map G2 chain guide. 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 most of our products at our facility in Grand Junction, CO, USA, in the heart of one of the best technical terrain (& product test sites). We expect the best from our products and strive to provide you with the highest quality products and the customer service and support that exceeds your expectations. Please feel free to contact us if you have any questions.