The Wolf Tooth Universal Derailleur Hanger - UDH is a small, functional upgrade to your UDH compatible bike. The hanger is fully CNC machined for stiffer construction, crisp shifting, and features a Color Shop anodized bolt and washer in nine hues to match Wolf Tooth's other components and accessories. Compatible with bike frames designed to accept the SRAM Universal Derailleur Hanger - UDH For Axle Thread Pitch M12x1.0 Rear axle not included NOT compatible with ABP equipped Trek bike models