3Racing SAK-65J Competition Pulley Set 39/40T  [SAK-65J]

3RACING Sakura Zero Replacement Gear Differential Pulley Gear 39 & 40T For #SAK-65 - SAK-65J
Price:
USD$4.40
Brand:
3Racing
Model:
SAK-65J
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Race-Oriented Ratio Adjustment for 3Racing SAK-65J

The 3Racing SAK-65J gear differential pulley is engineered for tuners aiming to optimise final drive on the Sakura Zero chassis. The 39 and 40 tooth pulleys allow incremental adjustments to the acceleration curve and top speed, letting you match gear ratio to motor characteristics and track layout. Designed to maintain consistent meshing and minimise backlash under high RPM, this pulley set supports repeatable setup changes for competitive running.

What tuning gains result from swapping the SAK-65J pulleys?

Switching between 39T and 40T yields a small but measurable change in final drive; expect quicker acceleration with 39T and a modest increase in top speed with 40T. Use telemetry or lap timing to validate changes for your specific setup.

Any installation tips for competitive builders?

Ensure precise spline engagement, verify backlash and shim clearance, and apply appropriate grease. Confirm pinion alignment and run bench checks at race RPM before track deployment to avoid premature wear.