420-19T Front Engine Sprocket (20mm) for 50cc–125cc Pit Bike & ATV

Product Overview

The 420-19T Front Sprocket is the ultimate gearing solution for riders looking to maximize the top-end speed of their small-displacement engines. Specifically designed for the 20mm countershaft, this massive 19-tooth sprocket allows your 50cc to 125cc engine to cruise at much higher velocities while keeping RPMs low. Crafted from hot-treated steel, it is built to survive high-speed friction and deliver a smooth, efficient power transfer for your go-kart, dirt bike, or ATV.

Product Compatibility

Component Type	Specification
Engine Displacement	50cc, 70cc, 90cc, 110cc, 125cc
Vehicle Types	Dirt Pit Bikes, ATVs, Go Karts, 4-Wheelers
Chain Pitch	420
Shaft Fitment	20mm Countershaft
Compatible Brands	TaoTao, Buyang, Kazuma, Sunl, Roketa, Coolsport

Specifications

Feature	Details
Tooth Count	19T (19 Teeth)
Inner Diameter	20mm (0.78")
Mounting Hole Distance	30mm (1.18") center-to-center
Chain Style	420
Material	Hot-Treated High-Strength Steel
Package Includes	1 x Sprocket, 1 x Locking Holder, 2 x Bolts

Key Features

• Ultimate Top-End Velocity: The 19-tooth configuration is one of the largest available for this engine class, drastically increasing your top speed and making it perfect for flat-track racing or road cruising.
• Complete Installation Kit: This sprocket comes as a full bundle, including a free locking holder (retainer clip) and mounting bolts, allowing for a direct and secure swap-out without needing extra hardware.
• Hot-Treated Steel Construction: The steel undergoes a specialized thermal treatment to increase surface hardness, ensuring that the teeth resist wear and deformation even under sustained high-speed use.
• Vibration Reduction: By lowering the engine RPM required to maintain speed, this sprocket helps reduce the numbing vibration often felt in the handlebars and footpegs of 110cc and 125cc bikes.
• Precision Mechanical Fit: Designed to 420-chain standards, the precision-cut teeth ensure a perfect mesh that minimizes chain jump and mechanical noise.