Torque & Fastener Reference
Correct torque prevents two opposite failures: fasteners working loose, and components being crushed or cracked by overtightening.
Always use a calibrated torque wrench for safety-critical fasteners — axles, stem bolts, brake calipers and suspension mounts.
Published torque values
| Fastener | Torque | Source |
|---|---|---|
| Rear rack fixing screw | 16 N·m | CEMOTO owner manual |
| Rear axle nuts | Firm — wheel must be secure with correct chain tension | Owner manual procedure |
| Handlebar stem bolts (M8, D-series) | Tighten with 8 mm hex; firm, in a cross pattern | Assembly procedure |
| Handlebar clamp bolts (M6, D-series) | Tighten with 6 mm hex; do not crush the clamp block | Assembly procedure |
| Front axle nut (D-series) | Firm; wheel must spin freely with no lateral play | Assembly procedure |
| Brake caliper mounting bolts | Firm; recheck after the first ride | Assembly procedure |
| Front fender screws (M5, D-series) | Firm with 5 mm hex; fender must not move under pressure | Assembly procedure |
| Front number plate bolt (M5, D-series) | Firm with 5 mm hex | Assembly procedure |
| Throttle / brake lever clamp (M4, D-series) | Firm with 4 mm hex; throttle must snap back freely | Assembly procedure |
| Pedals (eBikes) | Firm — hand-start, then wrench finish | Assembly procedure |
| Seat post clamp | Tight enough that the saddle cannot be rotated by hand | Assembly procedure |
Note: CEMOTO does not publish a complete torque table for every fastener. Where a value is not published, tighten to the general guidance below and never exceed the marking on the fastener or component.
General tightening guidance
| Fastener size | Typical application | Guidance |
|---|---|---|
| M4 | Lever clamps, small brackets, plastics | Light — these thread into aluminum or plastics and strip easily. Firm by hand plus a short wrench |
| M5 | Fender screws, number plate, panels | Firm, not forceful |
| M6 | Handlebar clamps, brake calipers, disc bolts | Firm with a standard-length wrench. A cross pattern where there are multiple bolts |
| M8 | Stem bolts, larger brackets | Firm with a longer wrench; use a cross pattern |
| Axle nuts | Wheel axles | Firm. The wheel must spin freely with no lateral play, and must not shift under braking or drive load |
| Suspension mounts | Shock and fork mounts | Follow the component guidance; these carry high loads |
Tightening technique
- Clean the threads and remove any grit. Debris in a thread causes false torque readings.
- Apply the correct lubricant or threadlocker if specified. Never apply threadlocker to a nylon-insert self-locking nut.
- Start fasteners by hand to avoid cross-threading.
- Bring multiple bolts up gradually in a cross (diagonal) pattern. Fully tightening one bolt first distorts the component.
- Use a torque wrench for the final pass on safety-critical fasteners.
- Never reuse a self-locking nut whose locking feature has worn, or a bolt that has stretched.
Safety-critical fasteners
These fasteners should be checked after assembly, after the first ride, and at every service:
| Fastener | Consequence of failure |
|---|---|
| Front axle | Wheel detachment — loss of control |
| Rear axle | Wheel shift, chain tension loss, possible rear wheel lock |
| Handlebar stem and clamp bolts | Bars rotate or detach — loss of control |
| Brake caliper mounting bolts | Brake loss |
| Brake lever clamp | Inability to brake |
| Suspension mounting bolts | Structural failure |
| Pedal spindles | Pedal detachment and crank damage |
| Motor mounting bolts | Motor movement, chain misalignment, phase wire damage |
Re-check after the first ride
Components seat and settle during the first 20–30 minutes of riding. Re-check every fastener above after your first ride — this is the single highest-value maintenance action on a new bike.
Threadlocker and lubricant guidance
| Application | Recommendation |
|---|---|
| Brake caliper bolts, stem bolts, suspension mounts | Medium-strength threadlocker is commonly used. Apply to clean, degreased threads |
| Axle nuts with nylon insert | No threadlocker. Replace the nut when the insert loses grip |
| Pedal threads | Light grease. Never threadlocker — pedals must be removable |
| Seat post | Light grease on the post, not on the clamp bolt |
| General bolts into aluminum | Anti-seize if the bike is ridden in wet or salty conditions |
Inspecting for loose fasteners
A fastener check takes a few minutes and catches most emerging problems. Look for:
- Witness marks. Paint flaking or a bright ring around a bolt head indicates movement.
- Thread wear. A bolt that requires noticeably less torque to tighten is stretching — replace it.
- Corrosion. Rust on a structural fastener reduces its strength.
- Missing hardware. Nuts and bolts lost on the trail should be replaced before the next ride, not after.
- Elongated holes. A bolt hole that has become oval indicates the joint has been moving — the component may need replacement.
Fastener maintenance intervals
| Interval | Action |
|---|---|
| After assembly | Torque all safety-critical fasteners |
| After first ride (20–30 min) | Re-check all safety-critical fasteners |
| Before every ride | Visual check of axles, stem and pedals |
| Weekly / after rough off-road use | Full fastener walk-around |
| Monthly | Check suspension mounts and motor mounts |
| Every 6 months | Full fastener inspection with a torque wrench |