SD-558A Mountain Bike Speedometer with 28 Functions and Blue Luminous Display for Bikes, E-Bikes, and Motorcycles

The SD-558A speedometer delivers 28 major cycling computer functions in a compact, easy-to-read unit. Its blue luminous backlight solves the common problem of reading your display at night – between 17:00 and 08:00, simply press any button to light up the screen for around 4 seconds. Whether you ride a mountain bike, a commuter bicycle, an electric vehicle, or even a motorcycle (4- to 40-inch wheel sizes), this device gives you the data you need: real-time speed, trip and total mileage, riding time, average speed, current time and date, and much more. The double-row, four-window LCD layout presents information clearly, so you can glance down and stay focused on the road.

Features and Construction

Built from engineering plastics with a durable LCD panel, the speedometer is designed for everyday use. Its sensor-based design provides stable speed readings across a wide working temperature range. The unit also includes practical extras like a stopwatch, speed comparison indicator, and speeding reminder to help you ride more safely.

28 Major Functions

The speedometer tracks real-time speed, average speed, maximum speed, trip distance, total mileage, riding time, total riding time, current time, and current date. It also includes a stopwatch, speed comparison indicator, and a speeding reminder that alerts you when you exceed a preset limit. Additional functions include vehicle refuelling and maintenance reminders, plus ambient temperature display.

Blue Luminous Backlight

The high-brightness cold light source provides a blue backlight that activates between 17:00 and 08:00. Press any button to turn it on, and it automatically extinguishes after about 4 seconds. This makes it easy to check your data in low-light conditions without draining the battery unnecessarily.

Size and Build

The main unit measures 9 x 4.5 x 1.5 cm, with a display area of 7.3 x 1.7 cm. The sensor wire is approximately 82 cm long, sufficient for most bike frames. Power comes from a single CR2032 button cell battery (included).

Uses and Placement

This cycling computer is designed for a wide range of two-wheeled vehicles. With compatibility from 4 to 40 inch wheels, it suits children's bikes, mountain bikes, road bikes, electric bikes, and even motorcycles and scooters.

Bicycle and E-Bike Use

Mount the speedometer on your handlebars and route the wire along the brake cable. The sensor attaches to the front fork and the magnet to a spoke. Use it to monitor your daily commute, track training progress, or simply know how far you've ridden.

Motorcycle and Scooter Use

The same setup works on motorcycles and scooters with wheel sizes up to 40 inches, provided you can securely attach the sensor and magnet. The speedometer's large display and backlight make it useful for night riding on these vehicles as well.

Multi-Unit Flexibility

Choose between metric and imperial units for speed and distance. The speedometer also offers Celsius or Fahrenheit temperature display, and 12- or 24-hour time format, making it suitable for riders in different regions.

Benefits and Buying Value

This speedometer delivers essential cycling data without a complicated setup. Its key advantage is the blue luminous backlight, which adds safety and convenience for night riders. The included battery and simple installation mean you can start using it immediately.

Easy to Install and Maintain

The package includes everything you need: the unit, sensor, magnet, handlebar mount, cable ties, and a CR2032 battery. The rainproof design and easy-to-wipe surface mean minimal upkeep. The automatic standby function saves battery when not in use.

Versatile Compatibility

Because it works on bikes, e-bikes, and motorcycles from 4 to 40 inches, you can use the same speedometer on multiple vehicles or upgrade without replacing the computer. The wide working temperature range also ensures reliable performance in various climates.

Why Choose This Product

For riders who need a reliable, multi-function cycling computer with a practical night-reading feature, the SD-558A offers 28 functions at a straightforward price. The blue backlight, speed comparison indicator, and speeding reminder add real-world value, while the easy-to-read LCD and flexible unit selection make it suitable for cyclists around the world.