SPIDER Automation | Sunding SD-548C 15-Function Wireless Cycling Computer | Digital Bicycle Speedometer with Backlight, Performance Tracking & Freeze-Frame Memory
The Sunding SD-548C Wireless Cycling Computer is a multifunction digital bicycle speedometer designed to provide detailed riding information through a compact handlebar-mounted display. With 15 operating functions, it combines real-time speed monitoring, odometer measurement, trip-distance tracking, maximum and average speed calculation, elapsed riding time, clock display and stored trip-data review.
The SD-548C uses a wireless wheel-speed sensing arrangement consisting of a front-fork sensor and wheel magnet. The sensor detects wheel rotation and transmits the corresponding information to the cycling computer, eliminating the need for a signal cable running between the wheel and handlebar display. Smart backlighting, automatic wake-up, auto on/off operation and freeze-frame memory further support convenient cycling-data monitoring.
Product Overview & Functional Design
Unlike a basic bicycle speedometer that displays only speed and distance, the SD-548C combines multiple riding measurements and data-management functions in one cycling computer. Its display provides access to current speed, cumulative mileage, individual trip distance, maximum speed, average speed and elapsed riding time.
The computer also supports configurable tyre circumference and speed-unit settings, allowing the wheel-based measurement system to be configured according to the bicycle. Its clock function supports both 12-hour and 24-hour formats, while the scan and auto-scroll modes help cycle through available riding information.
The wireless arrangement keeps the handlebar display free from a wheel-sensor signal cable. Automatic wake-up and sleep management reduce the need for repeated manual operation during normal cycling use.
Technical Features & Functional Characteristics
- 15-Function Digital Interface: Combines riding measurements, clock functions, data comparison, automatic scanning and memory operations in one cycling computer.
- Real-Time Speed Monitoring: Continuously displays current bicycle speed, with readings available in km/h or mph.
- Comprehensive Distance Tracking: Provides odometer and trip-distance functions for monitoring cumulative and individual ride distance.
- Performance Measurement: Records maximum and average speed to help riders review their cycling performance.
- Elapsed-Time & Clock Functions: Displays riding duration and supports a selectable 12-hour or 24-hour clock format.
- Wireless Wheel Detection: Uses a magnet and front-fork sensor to detect wheel rotation and transmit speed information to the display.
- Smart Backlighting: Provides display illumination to support visibility in reduced-light conditions.
- Freeze-Frame Memory: Holds selected trip information, including distance, maximum speed, average speed and elapsed time, for review.
- Automatic Wake-Up: Supports automatic activation in response to sensor activity.
- Auto On/Off Management: Automates display operation to reduce unnecessary manual switching.
- Automatic Sleep Mode: Enters sleep mode after a period without sensor input while retaining the clock value.
- Customisable Measurement Settings: Allows adjustment of speed units and tyre circumference, along with odometer value configuration.
- Auto-Scroll & Scan Modes: Supports automatic cycling through available display information.
- Trip Reset & Record Clearing: Provides button-operated functions for clearing selected trip measurements and performance records.
Wireless Speed-Sensing System
The SD-548C uses a wireless speed sensor mounted near the front wheel and a magnet attached to a rotating wheel component. As the wheel turns, the magnet passes the sensor, allowing it to detect wheel rotation and transmit speed-related data to the handlebar-mounted computer.
The stated sensor-to-computer transmission distance is up to 60cm. Correct magnet alignment, sensor positioning and tyre-circumference configuration are important for dependable speed and distance measurements.
- Wheel Magnet: Provides the rotating reference point detected by the speed sensor.
- Wireless Sensor: Detects magnet movement and transmits wheel-speed information to the display.
- Handlebar Computer: Processes the received wheel data to provide speed and distance readings.
- Tyre Circumference Setting: Allows the computer to calculate riding measurements according to the configured wheel circumference.
Display Functions & Data Management
The SD-548C provides several data modes to help cyclists monitor their riding activity and review trip performance.
- Current Speed: Continuously displays the bicycle’s current speed.
- Odometer: Tracks cumulative riding distance.
- Trip Distance: Measures the distance covered during an individual ride.
- Maximum Speed: Records the highest speed reached during the measured trip or data period.
- Average Speed: Provides average-speed information for reviewing riding performance.
- Elapsed Riding Time: Tracks the duration of the cycling session.
- Clock: Displays time in a selectable 12-hour or 24-hour format.
- Comparator: Provides a comparison function for cycling data.
- Scan Mode: Allows available measurements to be viewed through an automatic display sequence.
- Freeze-Frame Memory: Holds selected riding information for review without relying on continuous live display updates.
Automatic Operation & Power Management
The SD-548C incorporates automatic operating functions designed to reduce unnecessary manual interaction. Its wake-up function responds to sensor activity, while the sleep function activates after 300 seconds without signal input.
- Automatic Wake-Up: The computer can return to active operation when sensor activity is detected.
- 300-Second Sleep Activation: Enters sleep mode after 300 seconds without signal input.
- Clock Retention: Retains the clock value during sleep mode.
- Return to Previous Operation: Sensor activity or a button press can reactivate the computer and return it to the previous operating mode.
- Auto On/Off: Supports automatic operating-state management during periods of use and inactivity.
Mounting & Mechanical Installation
The SD-548C is designed for handlebar installation using the supplied mounting shoe. The wireless speed sensor is installed on the front fork, while the wheel magnet is positioned on a rotating wheel component. The supplied cable ties help secure the mounting arrangement.
- Display Mounting: Secure the mounting shoe to a suitable handlebar position where the display remains easy to view.
- Front-Fork Sensor Installation: Position the wireless sensor near the wheel magnet’s path.
- Wheel Magnet Alignment: Attach the magnet to a rotating wheel component so it passes the sensor consistently.
- Sensor Securing: Use the supplied cable ties to hold the sensor in its intended position.
- Initial Configuration: Set the correct tyre circumference and preferred speed unit according to the bicycle and instruction manual.
Applications
The Sunding SD-548C is intended for compatible bicycles where riders require a multifunction wireless cycling computer for speed, distance and performance monitoring.
- Mountain Bicycles: Provides speed, trip-distance and performance information for recreational and trail cycling.
- Road Bicycles: Supports monitoring of current speed, average speed and maximum speed during road rides.
- Electric Bicycles: Provides independent wheel-based speed and distance monitoring for compatible e-bike installations.
- Commuter Bicycles: Helps riders monitor accumulated mileage and individual journey distance.
- Fitness Cycling: Supports ride-performance review through speed, distance and elapsed-time measurements.
- Recreational Cycling: Provides multiple riding measurements for casual and regular cyclists.
- Touring Bicycles: Helps track trip distance and riding duration during longer journeys.
- Indoor Cycling Setups: Can be used in compatible setups where the wheel magnet and wireless sensor can detect wheel rotation.
Package Includes
- 1 × Sunding SD-548C Wireless Cycling Computer
- 1 × Mounting Shoe
- 1 × Wireless Speedometer Sensor
- 1 × Wheel Magnet
- 6 × Cable Ties
- 1 × Instruction Manual
Product Specifications
| Parameter | Specification |
|---|---|
| Brand | Sunding |
| Model | SD-548C |
| Product Type | Wireless Multifunction Bicycle Cycling Computer / Speedometer |
| Function Count | 15 functions |
| Display Technology | Digital display; LCD described in the product overview |
| Display Backlighting | Smart backlight |
| Colour | Black |
| Speed Measurement | Real-time current speed |
| Stated Speed Accuracy | ±0.1 km/h or mph |
| Speed Unit Selection | km/h or mph |
| Distance Measurement | Odometer and trip distance |
| Performance Measurements | Maximum speed and average speed |
| Time Functions | Elapsed riding time and clock |
| Clock Format | 12-hour or 24-hour format |
| Display Modes | Maximum speed, average speed, scan and comparator functions |
| Memory Function | Freeze-frame memory for distance, maximum speed, average speed and elapsed time |
| Automatic Operation | Automatic wake-up and auto on/off functions |
| Sleep Mode Activation | After 300 seconds without signal input |
| Sleep Mode Clock Retention | Clock value retained |
| Wireless Sensor Type | Wireless wheel-speed sensor |
| Speed Detection Method | Wheel magnet and wireless sensor |
| Sensor Installation Position | Front fork |
| Sensor Transmission Distance | Up to 60 cm |
| Tyre Circumference Setting | Configurable |
| Odometer Value Setting | Last odometer value can be configured |
| Trip Reset | LEFT button held for 5 seconds |
| Display Dimensions (L × W × H) | 46 × 46 × 18 mm |
| Mounting Type | Handlebar mount |
Connection & Operating Recommendations
Correct sensor positioning and initial configuration are important for reliable speed and distance measurement. Follow the supplied instruction manual for the model-specific setup and button operations.
- Configure Tyre Circumference: Enter the correct circumference for the bicycle’s wheel and tyre combination. Incorrect settings can affect speed and distance calculations.
- Align the Wheel Magnet: Position the magnet so it passes the front-fork sensor consistently during wheel rotation.
- Maintain Sensor Distance: Keep the wireless sensor within the stated transmission distance of the computer and avoid placing it where the signal path is obstructed.
- Secure the Installation: Use the supplied cable ties to secure the sensor and keep the assembly clear of spokes, tyres and other moving parts.
- Select the Correct Speed Unit: Configure km/h or mph according to the rider’s preferred measurement system.
- Use Freeze-Frame Memory for Review: Activate the memory function when you need to hold the relevant trip measurements for viewing.
- Follow the Reset Sequence: Use the specified LEFT-button operation for trip reset and consult the manual before clearing stored measurements.
- Check Sensor Response: Rotate the wheel after installation and confirm that the display responds to magnet movement before riding.
