Speeds: 12 Speed, 11-50T Cogs: 11-13-15-17-19-21-24-28-32-36-42-50T, Weight only : 21.38 OZ, Cog Material: Nickle-plated High Strength Steel; high-quality material improves the hardness and wear resistance of the flywheel, super anti-rust, All-round protection electroplating layer, adapt to harsh weather, Whether it's road climbing, wading, snowy wet Mud or Heavy Rainfall Carrier Material: Ultra-Light Aluminum Alloy, and Hollow Design Is Perfectly Combined, Reduce Bicycle Weight, Make Riding Easier Split Structure: The exquisite split structure is convenient to bring great convenience to later maintenance, easy to disassemble and clean About VG Sports：VG Sports is a professional manufacturer of bicycle accessories such as bicycle chain and bicycle flywheel. The products are suitable for all kinds of mountain bicycles, road bicycles, commuter bicycles and racing bicycles. The products are compatible with mountanin bike and road bike，If you have any questions,please feel free to contact us,we will provide you with quality service and caring answers. Compatible with Shimano (but SLX,Micro Splin,GRX Incompatible ), Compatible with SRAM (but Sram XD,XDR, GX,X01,X11 Incompatible)