F8 - Bike computer E3 - Free user manual and instructions
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| Product Type | Bike computer |
| Brand | E3 |
| Model | F8 |
| Dimensions | Approx. 4.5 x 2.5 x 1.5 cm |
| Weight | 30 g |
| Power Source | CR2032 coin cell battery |
| Battery Life | Up to 1 year (typical use) |
| Display Type | LCD |
| Functions | Speed, distance, trip distance, elapsed time, clock |
| Mounting | Handlebar or stem mount (included) |
| Wireless | Yes, magnetic sensor |
| Water Resistance | IPX4 (splash-proof) |
| Operating Temperature | -10°C to 50°C |
| Wheel Size Calibration | Manual input (wheel circumference) |
| Maintenance | Clean with a soft, dry cloth. Avoid solvents. |
| Safety | Do not look at display while riding. Ensure secure mount. |
| Spare Parts | Battery (CR2032), mounting bracket, sensor set |
| Repairability | Battery replacement only. No user-serviceable parts inside. |
| General Information | Designed for recreational cycling. Manual available for free download. |
Frequently Asked Questions - F8 E3
How do I replace the battery?
Open the battery compartment on the back using a coin. Replace with a CR2032 coin cell battery, positive side up.
Is the bike computer waterproof?
It has an IPX4 rating, meaning it is splash-proof but not fully waterproof. Avoid submersion.
How do I install the sensor and magnet?
Attach the sensor to the fork with a zip tie. Mount the magnet on a spoke, aligning it with the sensor. Keep 2-3 mm gap between them.
How do I set the wheel size?
Measure your wheel's diameter, then calculate circumference (diameter x 3.14). Input this value in mm in the settings menu.
Why is the display showing erratic speed?
Check magnet-to-sensor alignment and gap. Ensure the battery is fresh and the sensor cable is not damaged.
Can I use this computer on a stationary trainer?
Yes, if you mount the sensor on the rear wheel or use a trainer with a wheel speed sensor. It will record speed and distance based on wheel rotation.
How do I reset the trip distance?
Press and hold the MODE button for 3 seconds to reset the trip distance to zero.
What is the maximum speed it can display?
It can display speeds up to 99.9 km/h (or mph depending on setting).
Does it have a backlight?
No, this model does not include a backlight. Use in good lighting conditions.
How do I switch between km/h and mph?
Press the SET button for 5 seconds to enter settings. Use MODE to toggle between KM and MI, then press SET to confirm.
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