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420-15T Front Engine Sprocket (20mm) for 50cc–160cc Dirt Pit Bike & ATV
420-15T Front Engine Sprocket (20mm) for 50cc–160cc Dirt Pit Bike & ATV
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Product Overview
Boost your top-end speed and smooth out your ride with the 420-15T Heavy-Duty Front Sprocket. Specifically designed for the larger 20mm output shaft found on many 125cc to 160cc engines, this 15-tooth gear is the perfect upgrade for riders seeking higher cruising speeds and reduced engine vibration. Constructed from high-quality stainless steel, it offers a superior combination of strength and environmental resistance, making it ideal for the grueling conditions of off-road pit bike and ATV racing.
Product Compatibility
| Component Type | Specification |
| Engine Displacement | 50cc, 70cc, 110cc, 125cc, 140cc, 160cc |
| Vehicle Types | Dirt Pit Bikes, ATVs, Mini Bikes, 4-Wheelers |
| Chain Pitch | 420 |
| Shaft Fitment | 20mm Countershaft |
| Popular Brands | SSR, SDG, Pitster Pro, TaoTao, Baja, Coolster |
Specifications
| Feature | Details |
| Tooth Count | 15T (15 Teeth) |
| Fit Shaft Diameter | 20mm (0.78") |
| Mounting Hole Pitch | 35mm (1.37") center-to-center |
| Chain Size | 420 |
| Material | High-Grade Stainless Steel |
| Properties | Corrosion Resistant & Heat Resistant |
Key Features
- Higher Gear Ratio: The 15-tooth design provides more speed per RPM compared to standard 10T or 12T sprockets, making it the go-to choice for open-trail riding and higher top speeds.
- Stainless Steel Manufacturing: Unlike standard carbon steel sprockets, this stainless steel version offers exceptional resistance to rust and oxidation, ensuring the teeth stay sharp even in wet or muddy environments.
- Optimized Thermal Endurance: Engineered with high heat resistance to prevent the sprocket from softening during long, high-RPM rides, maintaining precise chain engagement at all times.
- Universal 35mm Mounting: Features a 35mm bolt-hole spacing designed to fit the standard 20mm shaft locking plates used by major Chinese pit bike manufacturers.
- Precision Mechanical Timing: Designed to mesh perfectly with any 420-pitch chain, reducing mechanical drag and ensuring efficient power transfer from the crankshaft to the rear wheel.
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Fitment FAQ
Will this part fit my specific model and year?
This replacement part is intended for 50cc–160cc Dirt Pit Bike & ATV. It is best matched to original part number(s) 420-15T. Key physical/spec details from the product data include Tooth Count: 15T (15 Teeth), 15T (15 Teeth), Fit Shaft Diameter: 20mm (0.78"). Use the compatibility table and product photos together before ordering.
Do I need to match the OEM part number?
Yes. Match your original part number to 420-15T before purchase. For this replacement part, also compare the OEM number, dimensions, connector or mounting style, engine/model year, and product photos.
What models or situations does this part not fit?
Do not order this replacement part for machines outside the listed compatibility, or for units with different OEM numbers, dimensions, mounting points, connectors, or year-specific configurations. If your original part number does not cross-reference with 420-15T, treat the fitment as unconfirmed. Do not rely only on the model name or engine size.
What should I check before ordering?
Before ordering, compare your original part with the photos and check the OEM number, dimensions, connector or mounting style, engine/model year, and product photos. Confirm OEM/cross-reference number(s): 420-15T. Recheck listed specs such as Tooth Count: 15T (15 Teeth), 15T (15 Teeth), Fit Shaft Diameter: 20mm (0.78"). If any connector, mounting point, size, or year detail is different, confirm fitment before installation.