Supersprox / Sunline Heavy Duty Steel Front Countershaft Sprocket (14-Tooth / 420 Pitch) — Part #1900-420-14
$5.00
Sale price
$5.00
Regular price
$34.99
Skip to product information
Supersprox / Sunline Heavy Duty Steel Front Countershaft Sprocket (14-Tooth / 420 Pitch) — Part #1900-420-14
$5.00
Sale price
$5.00
Regular price
$34.99
Product Overview
The Supersprox / Sunline Heavy Duty Steel Front Countershaft Sprocket (Part #1900-420-14) is a premium, competition-spec drivetrain component manufactured utilizing industry-standard Supersprox core design architectures (cross-referenced under the master CST-1900-14-1 layout). This heavy-duty 14-tooth front engine sprocket is built to manage primary power transmission by transferring high-torque rotation directly from your engine's transmission countershaft out to the final drive drivetrain via a standard 420-pitch drive chain. Serving as an exact OEM replacement alternative, it delivers smooth power-split mechanics, reliable speed indexing, and original factory longevity under rigorous trail, pit bike, and mini-mx usage. [1]
Technical Specifications
- Brand / Core Manufacturer: Supersprox / Sunline Distributed
- Part Number: 1900-420-14 (Core Factory MPN: CST-1900-14-1)
- Product Type: Drive Train / Front Countershaft Engine Sprocket
- Material: Specialized SCM-435 Carbon-Free structural chromoly steel with gas-impregnated carbon encapsulation.
- Finish: Induction case-hardened raw steel with an ultra-hard, anti-friction protective surface layer.
- Size Profile: 14-Tooth (14T) configuration cut explicitly for a 420 final drive chain pitch.
- Spline Geometry: Precision CNC-machined 12-spline interface layout.
- Total Thickness: 8mm exact plate structural thickness.
- Mounting Position: Front Engine Countershaft. [1]
Key Features & Benefits
- SCM-435 Carbon-Free Steel: Forged from premium structural chromoly steel featuring an elastic internal core that dynamically absorbs sudden landing shock loads, preventing the teeth from fracturing or snapping when heavily worn. [1]
- Grooved Self-Cleaning Teeth: Features innovative precision-machined mud and debris relief trenches at the base of the tooth faces. These escape paths actively fling away packed dirt, mud, and track grime to maximize sprocket and chain lifecycle efficiency. [1]
- Fully Lightened Radial Design: Engineered with strategic computer-aided design (CAD) radial recess holes that drop unsprung rotating mass to deliver ultra-crisp throttle response without sacrificing gear structural rigidity. [1]
-
Reduced Friction & Power Drag: The specialized carburized exterior shell significantly lowers surface friction drag against the chain rollers, maximizing rear-wheel horsepower distribution and preventing power loss caused by drive drag.
[1]
Confirmed Vehicle Fitment
This specific 12-spline footprint configured for a 420 chain pitch is a confirmed direct fit for an extensive range of small-displacement pit bikes, mini-motocross dirt bikes, youth quads, and off-road platforms utilizing standard 12-spline countershaft configurations: [1, 2]
| Manufacturer | Engine Profile Range | Gearing Context | Chain Pitch / Teeth |
|---|---|---|---|
| Pit Bike / Dirt Bike Platforms | 50cc, 70cc, 90cc, 110cc, 125cc, 140cc, 150cc, 160cc | Stock Gearing / Direct Swap | 420 Pitch / 14-Tooth |
| Mini Quad / ATV 4-Wheeler | 50cc to 125cc V-Twin/Horizontal Engines | Stock Gearing / Direct Swap | 420 Pitch / 14-Tooth |