1. Introduction
Thank you for choosing the DMASUN 8732B Magnetic Resistance Exercise Bike. This manual provides essential information for the safe assembly, operation, and maintenance of your new fitness equipment. Please read this manual thoroughly before using the exercise bike and retain it for future reference.
2. Important Safety Information
To ensure your safety and prolong the life of your exercise bike, please observe the following precautions:
- Consult a physician before starting any exercise program.
- Keep children and pets away from the equipment during use.
- Place the exercise bike on a flat, stable surface with adequate clearance around it.
- Inspect the bike for loose or damaged parts before each use. Do not use if any components are compromised.
- Wear appropriate exercise attire and footwear. Avoid loose clothing that could get caught in moving parts.
- The maximum user weight capacity for this bike is 160 kg (350 lbs). Do not exceed this limit.
- Stop exercising immediately if you feel faint, dizzy, or experience pain.
- Ensure all bolts and nuts are securely tightened before and during use.
3. Setup and Assembly
The DMASUN 8732B exercise bike requires some assembly. Follow these general steps. Refer to the separate assembly guide for detailed, step-by-step instructions and diagrams.
3.1 Unpacking
- Carefully remove all components from the packaging.
- Check the contents against the parts list provided in your assembly guide to ensure all parts are present.
- Keep packaging materials until assembly is complete in case any parts are missing or damaged.
3.2 Assembly Steps (General)
- Attach the front and rear stabilizers to the main frame.
- Install the pedals, ensuring they are tightened correctly (left pedal is reverse threaded).
- Mount the seat post and seat, then the handlebar post and handlebars.
- Connect the LCD monitor cables and attach the monitor to the handlebar assembly.
- Perform a final check to ensure all connections are secure.

Image: The DMASUN 8732B Exercise Bike after assembly, showcasing its robust design.
3.3 Adjusting for User Comfort
Proper adjustment is crucial for effective and comfortable workouts.
- Seat Adjustment: The seat can be adjusted 4 ways (up/down, forward/backward). Loosen the adjustment knob, slide the seat to the desired position, and tighten the knob securely. Your knees should have a slight bend at the bottom of the pedal stroke.
- Handlebar Adjustment: The handlebars can be adjusted 2 ways (up/down). Loosen the adjustment knob, raise or lower the handlebars to a comfortable height, and tighten the knob. Your back should be straight and your arms slightly bent.

Image: Illustration of the 4-way adjustable seat and 2-way adjustable handlebars, accommodating various user heights.
4. Operating Instructions
4.1 Powering On the LCD Monitor
The LCD monitor is battery-powered. It will automatically turn on when you start pedaling or press any button. It will turn off automatically after a period of inactivity.
4.2 Understanding the LCD Monitor
The monitor displays key workout data:
- TIME: Duration of your workout.
- SPEED: Current cycling speed.
- DISTANCE: Distance covered during the current workout.
- CALORIES: Estimated calories burned.
- ODOMETER: Total accumulated distance.
- PULSE: Heart rate (when holding the pulse sensors on the handlebars).

Image: Close-up of the LCD monitor, showing various exercise data points like time, speed, distance, calories, and pulse.
4.3 Adjusting Magnetic Resistance
The DMASUN 8732B features a magnetic resistance system with 21 levels, providing a smooth and quiet ride. The resistance is adjusted using the red knob located on the main frame.
- Increase Resistance: Turn the knob clockwise to increase the resistance level, making pedaling harder.
- Decrease Resistance: Turn the knob counter-clockwise to decrease the resistance level, making pedaling easier.
- Emergency Stop: Press the red knob down firmly to engage the emergency brake and stop the flywheel immediately.

Image: The red resistance knob, indicating adjustable magnetic resistance from 0% to 100% for various training intensities.
4.4 Pedal Straps and Accessories
- Pedal Straps: Adjust the straps on the pedals to secure your feet, preventing slippage during intense workouts.
- Tablet Holder: A built-in holder allows you to place a tablet or smartphone for entertainment during your workout.
- Water Bottle Holder: Conveniently located to keep hydration within reach.

Image: A collage highlighting key features: soft and comfortable seat, transport wheels, water bottle holder, and cage-type non-slip pedals.
5. Maintenance
Regular maintenance ensures the longevity and optimal performance of your exercise bike.
- Cleaning: Wipe down the bike with a damp cloth after each use to remove sweat and dust. Avoid abrasive cleaners or solvents.
- Inspection: Periodically check all bolts, nuts, and moving parts for tightness and wear. Tighten any loose fasteners.
- Belt Drive: The magnetic resistance system and belt drive are designed for low maintenance. No lubrication is typically required for the belt.
- Storage: When not in use, store the bike in a dry, cool place away from direct sunlight and extreme temperatures. The integrated transport wheels allow for easy relocation.

Image: A user demonstrating the ease of moving the exercise bike with its integrated transport wheels.
6. Troubleshooting
If you encounter issues with your DMASUN 8732B exercise bike, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| LCD Monitor not displaying | Dead batteries; Loose cable connection | Replace batteries; Check and secure monitor cable connections. |
| Unusual noise during operation | Loose bolts/nuts; Friction from moving parts | Inspect and tighten all fasteners; Ensure no parts are rubbing. |
| Resistance not changing | Resistance knob not fully engaged; Internal mechanism issue | Turn the resistance knob firmly; If issue persists, contact customer support. |
| Bike feels unstable | Uneven floor; Loose stabilizers | Adjust the leveling feet on the stabilizers; Ensure stabilizer bolts are tight. |
If these solutions do not resolve the issue, please contact DMASUN customer support.
7. Specifications
| Feature | Detail |
|---|---|
| Brand | DMASUN |
| Model Name | 8732B |
| Resistance Mechanism | Magnetic |
| Number of Resistance Levels | 21 |
| Drive System | Belt |
| Special Features | LCD Monitor, Tablet Holder, Heavy Flywheel, Magnetic Resistance, Comfortable Seat, Easy Installation |
| Color | Black |
| Power Source | Battery Powered (for LCD monitor) |
| Recommended Use | Indoor |
| Product Weight | 30 Kilograms |
| Material | Stainless Steel |
| Product Dimensions (L x W x H) | 114 cm x 52 cm x 120 cm |
| Maximum User Weight | 160 Kilograms |
| UPC | 737970280742 |
8. Warranty and Support
For information regarding warranty coverage, please refer to the warranty card included with your product or visit the official DMASUN website. If you require technical assistance, replacement parts, or have any questions not covered in this manual, please contact DMASUN customer support through the retailer where you purchased the product or via the contact information provided on the DMASUN website.