Sturmey Archer RX-RC5 is a 5-speed internally geared coaster brake rear hub with a gear ratio of 243%. Gear steps of 25%,25%,25% and 25% with rotary gear selector without protrusions outside the frame.Features:Designed for heavy duty use A356 Aluminium hub shell Compatible with 16 to 22 tooth sprocketSpecifications:Defined Color: Silver Color: Silver Weight: 2400 Hub Drilling: 32Spoke Interface: J-Bend Hub/Brake Compatibility: Coaster Brake Drivetrain Speeds: 5