Shimano SB-CT90 is a shifting lever designed for use with Rapidfire TX rear derailleurs. It is compatible with 7- or 6-speed cassettes and features a one-step shift operation, allowing you to shift up or down one gear with each press of the lever. The lever also has an indicator window that displays the current gear position. The SB-CT90 is a reliable and durable shifting lever that is ideal for use on mountain bikes and other off-road applications. Here are some of the key features and benefits of the Shimano SB-CT90 shifting lever:

• One-step shift operation for quick and easy shifting
• Compatible with 7- or 6-speed cassettes