This cassette is ideal for use with road and mountain bikes, this durable and dependable cassette is engineered from nickel-plated steel for the ultimate in strength and reliability. Plus, it's compatible with standard freehub bodies and most 8-Speed drivetrains. Gear Ratios: Cassettes for 8 Speed 12-25T: 12-13-15-17-19-21-23-25 11-28T: 11-13-15-17-19-21-24-28 12-32T: 12-13-15-18-21-24-28-32 11-32T: 11-13-15-18-21-24-28-32 11-34T: 11-13-15-18-21-24-28-34