We understand that the gnarly line requires a lot more focus than a supermarket ride. That's why we've packed the GX DH 1x X-HORIZON™ rear derailleur with features that won it the world championship, and we've priced it more in line with Wednesday night championships. It's a DH derailleur that's easier to change, incredibly accurate, and minimizes unwanted chain slap noise, so you can focus on the sweet feeling of getting your line right. GX DH - Go for it.Features:X-ACTUATION™ for precise and reliable 7-speed performance.Fully compatible with the SRAM X01 DH transmission - X-HORIZON™ design reduces shifting force, ghost shifting and cage rattlingX-SYNC™ 12-tooth pulley wheelsSpecifications:Speed (RD): 7sCable pull ratio: Exact actuationCage (RD): MediumMaximum tooth: 28Sheave bearing material: SteelCage material (RD): Aluminium