428-13T Front Engine Sprocket (17mm) for 50cc–160cc Dirt Pit Bike & ATV

Product Overview

Optimize your drivetrain with the 428-13T Heavy-Duty Front Sprocket, designed for riders who demand a balance of quick acceleration and steady mid-range power. Engineered for the robust 428-series chain, this 13-tooth sprocket is a direct fit for 17mm countershafts common on most 50cc to 160cc engines. With high machining accuracy and excellent thermal stability, it ensures smooth power delivery and consistent performance even under high-temperature, off-road conditions.

Product Compatibility

Component Type	Specification
Engine Displacement	50cc, 70cc, 110cc, 125cc, 140cc, 160cc
Vehicle Types	Dirt Pit Bikes, Mini Bikes, ATVs, 4-Wheelers, Motorcycles
Chain Pitch	428 (Heavy Duty)
Shaft Fitment	17mm Countershaft
Common Brands	Apollo, SSR, Coolster, TaoTao, Piranha, YX

Specifications

Feature	Details
Tooth Count	13T (13 Teeth)
Shaft Diameter	17mm
Gear Inner Diameter	14mm (0.55")
Outer Diameter	57mm (2.24")
Mounting Hole Spacing	30mm (1.18") center-to-center
Chain Size	428

Key Features

• Balanced Gearing Ratio: The 13-tooth configuration offers the "sweet spot" for 428 chain setups, providing enough torque for hill climbing while maintaining a smooth top-end speed.
• Superior Thermal Stability: Engineered to resist high-temperature oxidation, this sprocket maintains its structural integrity and hardness during long, intense rides on air-cooled engines.
• Precision Machining Accuracy: Manufactured to strict tolerances to ensure a perfect seat on the 17mm output shaft, reducing mechanical vibration and protecting your engine’s internal components.
• High Wear Resistance: Crafted from high-strength steel designed to withstand the abrasive grit of off-road environments, significantly extending the time between drivetrain maintenance.
• Universal 30mm Mounting: Features the industry-standard 30mm mounting hole spacing, making it compatible with almost all 17mm shaft locking plates and bolt kits used on Chinese pit bikes and ATVs.