For many e-bike users, the most common question is simple: “How long will the motor last?”
Conventional mid-drive motors often face declining performance after just two years — caused by gear wear, coil aging, and mechanical fatigue.
In contrast, PREETO motors are engineered for a design life of five years, with a failure rate below 0.5%, built to withstand intensive daily use such as commuting, express delivery, and logistics cycling.
This exceptional longevity comes from a full-chain durability strategy, spanning materials, structural design, and rigorous testing.
Material Reinforcement: Strength Starts from the Core
PREETO targets high-wear components with automotive-grade materials:
Transmission gears use 20CrMnTi alloy steel, with carburized and quenched surfaces reaching HRC58 hardness.
This increases wear resistance by more than 2× compared with standard alloy gears.
In gear bending fatigue tests, PREETO gears endured over 1,000,000 engagement cycles without failure — enough to handle couriers who start and stop hundreds of times daily over 50 km routes.
Motor coils use 155 °C high-temperature enameled copper wire, 30% slower in aging than conventional 130 °C wires.
Even under continuous high-power output in hot summer conditions, the coils maintain performance without thermal degradation.
Structural Design: Reducing Fatigue from the Inside Out
Durability doesn’t stop at material selection — it’s engineered into every structural detail:
The three-stage parallel transmission design reduces 3–4 gears compared to planetary drives, cutting down cumulative gear fatigue.
Over time, this translates to 25% fewer gear engagements per ride, significantly extending service life.
The air gap between stator and rotor is tightly controlled at 0.2 mm ± 0.01 mm, preventing both excessive vibration wear (if too wide) and friction heating (if too narrow).
Bearings are premium NSK deep-groove ball bearings from Japan, paired with low-temperature lubricating grease that retains fluidity down to –30 °C.
In cold-weather starts, bearing wear is reduced by up to 40% compared to conventional greases.
Beyond Industry Standards: Extreme Testing for Real Reliability
Every PREETO motor must pass a 5,000-hour endurance bench test, simulating continuous high-load operation equivalent to five years of real-world use.
It’s then validated by 10,000 km of on-road tests, covering urban asphalt, mountain gravel, and muddy rain conditions.
In total, each model undergoes 200+ rigorous reliability tests, including:
Gear bending fatigue test — applying 1.2× rated torque for 100,000 load cycles.
Thermal cycling test — repeatedly alternating –20 °C to 55 °C, simulating day-night temperature and condensation stresses.
These tests ensure PREETO motors remain stable under extreme temperatures, heavy loads, and long-term operation — minimizing maintenance needs and maximizing uptime.
Built to Last, Ride After Ride
From alloy composition to assembly precision, from electromagnetic balance to environmental stress testing, durability is engineered into every PREETO motor.
For high-frequency riders — couriers, commuters, or touring enthusiasts — that means consistent torque, minimal wear, and years of dependable performance.
With every kilometer, PREETO proves that longevity is not just a promise — it’s precision you can feel.
Certifications & Standards
All PREETO products are developed and manufactured under:
ISO 9001 and IATF 16949 quality management systems,
ISO 14001 environmental management certification, and
Compliance with EN15194, CE, and TÜV standards.
Inquiry
