Pinion Gear 15 Tooth (1M / 3.175Mm Shaft)

Give your HPI WR8 Flux the perfect combination of speed and acceleration with this 15T pinion gear (1M / 1.0 module) for 3.175 mm motor shaft. It’s an original replacement gear, perfect when the old one is worn out, or when you want to fine-tune the gearing to your driving style and track surface.

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Features and benefits

• 15-tooth pinion gear for precise fine-tuning of gearing
• 1M (1.0 module) tooth profile – matches the WR8 Flux drivetrain
• Fits 3.175 mm (1/8\") motor shaft – standard on most 540/550 brushless motors
• Robust metal gear, designed for powerful brushless setups
• Ideal as both a replacement and tuning part

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Gearing tuning – how it affects the car
With pinion gearing you can easily change how your WR8 Flux behaves:

• Larger pinion gear (more teeth)
• Higher top speed
• Slightly slower acceleration
• Can result in higher motor temperature – requires good cooling

• Smaller pinion gear (fewer teeth)

• Faster acceleration and more punch out of corners
• Lower top speed
• Less strain and lower motor temperature

15T is a good all-round choice that provides a nice balance between speed and control for mixed driving.

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Specifications

• Number of teeth: 15
• Module: 1M (1.0 module)
• Shaft bore: 3.175 mm (1/8\")
• Type: Pinion gear (motor gear)
• Use: Replacement and gearing tuning for WR8 Flux

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Compatibility
Fits:

• HPI WR8 FLUX 2001 WRC Subaru Impreza

Designed specifically as a replacement pinion gear for the WR8 Flux platform, ensuring correct mesh with the spur gear and optimal operation.

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Installation tips

• Ensure correct mesh between pinion and spur (a slight “play” between the teeth)
• Use thread lock (blue Loctite) on the pinion screw to prevent it from loosening
• Check motor and ESC temperatures after changing gearing, especially when using a larger pinion

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With this 15T pinion gear (1M / 3.175 mm shaft), you get a simple and effective way to adapt your HPI WR8 Flux to track, surface, and driving style – whether you’re chasing top speed or explosive acceleration.