Dimension Freewheels are excellent drivetrain component replacements. With smooth shifting performance and durable construction, they'll help breathe new life into older bikes. FEATURES: One-piece design Shimano index compatible Works with most friction shifters Suitable for use with e-bike drivetrains SPECS: Drivetrain Speeds: 8 Cassette Cogs: 11-13-15-18-21-24-28-34 Range: 11-34T