Durable aluminum alloy construction with waterproof sealing provides a sturdy mechanical speedometer for bicycles and tricycles. This wired device delivers accurate speed and distance measurements, with a red pointer that is easy to read at a glance. Benefits Battery operation and low maintenance; reliable performance in rain or shine. Clear, quickread display helps you stay aware of speed without distraction. Compatibility Suitable for 26, 27.5, 28, and 29 inch wheels. Please confirm your wheel size before . Installation Complete accessories and straightforward, doityourself installation. Lightweight and compact for easy mounting on most bikes or spare setups. Use cases Daily city commuting on mixed terrain where you need steady, readable data. Road rides or mountain trips with traditional wheel sizes; switch between bikes without changing sensors. Bike rental fleets or workshops requiring quick setup and durable, weatherresistant meters.