Kepler 52v Post 2026: First TuneUpdated 2 days ago
Important: If you find any issues during this inspection, do not ride the bike. Take it to a reputable bike shop for service, or contact Ariel Rider technical support. |
Step 1: Power Down & Remove Batteries
Always start with the bike fully powered off before any inspection.
Turn the bike off using the display keypad.
Remove the top tube battery.
Remove the downtube battery.
Tip: Never inspect electrical components or check fasteners with the bike powered on. |
Step 2: Check Critical Fastener Torque
Use a calibrated torque wrench to verify each fastener is tightened to the correct specification. Under-torqued fasteners can loosen while riding; over-torqued fasteners can strip threads or damage components.
Part | Tool | Torque Spec |
Brake caliper adapter bolt | 5mm hex wrench | 6–7 Nm |
Front axle nut | 15mm wrench | 40 Nm |
Stem faceplate bolts | 4mm hex wrench | 5–6 Nm |
Stem angle adjust bolt | 5mm hex wrench | 25 Nm |
Stem clamp bolts | 5mm hex wrench | 20 Nm |
Stem cap bolt | 5mm hex wrench | 6–7 Nm |
Battery tray screws | T25 Torx wrench | 5–6 Nm |
Seat mount bolt | 6mm hex wrench | 10–12 Nm |
Rack bolts | 4mm hex wrench | 5–6 Nm |
Derailleur hanger bolt / derailleur | 5mm hex wrench | 5–6 Nm |
Rear axle nut | 22mm torque wrench | 50 Nm |
Front axle bolt | 5mm torque wrench | 12 Nm |
Pedal axle | 15mm slim wrench | 35 Nm |
Crank arm / spindle bolt | 8mm hex wrench | 35 Nm |
Step 3: Check Tire Pressure
Locate the recommended tire pressure printed on the sidewall of each tire.
Use a portable Ariel Rider tire pump to inflate each tire to the recommended pressure.
Step 4: Inspect the Brakes
Stopping power
With the bike powered off, roll it forward at walking pace.
Squeeze the front brake lever firmly. The wheel should stop immediately.
Repeat with the rear brake lever independently.
Lever feel
When squeezing each lever:
There should be plenty of travel before the brake engages (not grabbing immediately at the lever).
The lever must not feel squishy or soft.
The lever must not contact the handlebar grip at full squeeze.
Important: If either lever feels squishy or contacts the grip, your brakes need adjustment or bleeding before you ride. |
Brake pad condition
Visually inspect both sets of brake pads for alignment and even wear.
Use a 2mm hex wrench as a thickness gauge. If the pad is thinner than 2mm, it must be replaced before riding.
Step 5: Test Lights and Turn Signals
Power on the bike.
Test the headlight on both low beam and high beam.
Activate the right turn signal and confirm both front and rear right lamps flash.
Activate the left turn signal and confirm both front and rear left lamps flash.
Power the bike back off when done.
Step 6: Inspect the Wheels
Spoke tension
Squeeze parallel spoke pairs around each wheel.
All pairs should feel equally taut. Tighten any loose spokes with a spoke wrench before continuing.
Wheel trueness (alignment)
Wrap a zip tie around the swing arm and trim it so it just clears the rim.
Spin the wheel slowly and watch whether it contacts the zip tie at any point.
If the wheel contacts the zip tie, it is out of true and requires service.
Important: Do not attempt to true the wheel yourself. Take the bike to a qualified bike shop for wheel truing. |
Axle torque
Torque both rear axle nuts to 50 Nm using a 22mm socket on an adjustable torque wrench.
Confirm the front axle nuts are torqued to 40 Nm.
Step 7: Check Motor Cable Routing
Locate the motor cable barrel connector and confirm it is fully threaded together and tight.
Check that the motor cable is not in the path of the rotor bolts as the wheel spins.
If the cable is at risk of contact with the rotor, clip the existing zip ties along the swing arm and relocate the cable to a safe position, securing it with new zip ties.
Step 8: Check the Drivetrain
Pedal torque
Using a 15mm open-end wrench adapter on an adjustable torque wrench, torque each pedal axle to 35 Nm.
Note: the left pedal has a left-hand thread and tightens counter-clockwise.