428-19T Front Engine Sprocket (17mm) for 50cc–125cc Pit Bike & ATV

Product Overview

The 428-19T Front Sprocket is the ultimate gearing solution for riders who want to push their small-displacement engines to their absolute top-end potential. Designed for the standard 17mm countershaft, this massive 19-tooth sprocket drastically changes your gear ratio, allowing for much higher cruising speeds and significantly lower engine vibration. Crafted from hot-treated steel and built for the heavy-duty 428-series chain, it provides the strength and stability needed for high-velocity operation on go-karts, mini-bikes, and ATVs.

Product Compatibility

Component Type	Specification
Engine Displacement	50cc, 70cc, 90cc, 110cc, 125cc
Vehicle Types	Dirt Pit Bikes, ATVs, Go Karts, 4-Wheelers
Chain Pitch	428 (Heavy Duty)
Shaft Fitment	17mm Countershaft
Common Brands	TaoTao, SSR, Apollo, Lifan, YX, Zongshen

Specifications

Feature	Details
Model	428 Style / 19 Teeth
Inner Diameter	17mm (0.67")
Mounting Hole Distance	30mm (1.18") center-to-center
Chain Size	428
Material	Hot-Treated High-Strength Steel
Package Includes	1 x Sprocket, 1 x Locking Holder, 2 x Bolts

Key Features

• Maximum Speed Upgrade: The 19-tooth configuration is one of the largest sizes available, offering a significant boost in top-end velocity. It is perfect for long-distance cruising or flat-track racing where high speed is the priority.
• Vibration Reduction: By increasing the tooth count, you allow your 110cc or 125cc engine to maintain speed at a much lower RPM, resulting in a smoother ride with less "screaming" from the engine.
• Hot-Treated Steel Construction: The steel is thermally hardened to provide exceptional durability, ensuring the sprocket can handle the heat and friction of sustained high-speed chain engagement.
• Complete Installation Kit: This package includes a free retainer holder and mounting bolts, providing everything you need for a direct installation without the need for additional hardware.
• Robust 428 Design: Sized specifically for 428 chains, this sprocket features thicker, stronger teeth than standard 420 versions, offering superior reliability for high-performance builds.