Giant SyncDrive Pro3
Giant's flagship 2026 drive jumps to 48 volts, co-developed with Yamaha and widely understood to use the new 48 V PW-X4 platform. Giant quotes 90 Nm of sustained torque and 800 W of peak power, with the instant low-cadence punch SyncDrive has always been known for.
Illustrative, not a Pro3 dyno trace. Strong from very low cadence thanks to Zero Cadence, a broad plateau through 60-90 rpm, then a gentle Yamaha-typical taper past 100 rpm. Anchored on Velomotion's measured Pro2 behaviour (682 W maximum output at max torque) and scaled to Giant's claimed 800 W Pro3 peak.
Giant SyncDrive Pro3 is Giant's most significant motor leap in years: a move from the long-running 36 V SyncDrive Pro2 to a fresh 48 V architecture co-developed with Yamaha and widely understood to share its hardware with the new PW-X4. Giant quotes 90 Nm of sustained torque (note: a constant figure, not the peak number most rivals headline), 800 W of peak power and support of up to 400%, in a magnesium housing that keeps weight to 2.6 kg — figures that pull the brand level with the 48 V Bosch and Specialized units it used to trail.
The defining trait carries over from earlier SyncDrive generations: Yamaha's Zero Cadence response. Power arrives the instant you load the pedals rather than waiting for you to spin up, which makes the Pro3 feel immediate and intuitive on steep, low-speed technical climbs. The higher-voltage, lower-current 48 V design lets Giant claim cleaner delivery and less heat for a given power than the 36 V Pro2.
One honest caveat: as a freshly launched 2026 motor, the Pro3 has no independent dyno verification yet. Velomotion measured a maximum 682 W from the previous 36 V Pro2 at full torque (250 W rider input), so the Pro3's 800 W headline remains a manufacturer claim until the test benches catch up. Treat the 90 Nm / 800 W / 400% figures as Giant's published numbers, not lab-confirmed ones.
Character
The case for and against
Strengths
- Instant Zero Cadence response on steep, slow climbs
- Big 48 V step up to a claimed 800 W peak
- Light for its class at 2.6 kg
- 90 Nm is sustained torque, not a fleeting peak
- Historically quiet, rattle-free running
Compromises
- No independent dyno, thermal or noise data yet (2026 launch)
- 800 W peak and 400% support are manufacturer claims, unverified
- Outgunned on raw peak power and torque by Avinox
- Tied to Giant frames and the RideControl ecosystem
