• Front Sprocket 420-12T 17mm For 50cc- 150cc Engine - goofitmoto
1 5

GOOFIT

420-12T Front Sprocket 17mm for 50cc-150cc Pit Dirt Bike ATV

420-12T Front Sprocket 17mm for 50cc-150cc Pit Dirt Bike ATV

$8.99
$8.99
Sale Sold out
Shipping calculated at checkout.

Product Overview

This 420-12T front sprocket is designed as a replacement drive sprocket for many 50cc, 70cc, 90cc, 110cc, 125cc, 140cc, and 150cc pit bikes, dirt bikes, motorcycles, and ATVs using a compatible 420 chain setup.

The sprocket helps transfer engine power from the front drive shaft to the chain, supporting smooth acceleration and stable drivetrain performance. A worn or damaged front sprocket may cause chain slipping, abnormal noise, poor power transfer, or faster chain wear.

Made from heat-treated steel, this sprocket is built for durability, wear resistance, and long service life. The inner diameter is 17mm / 0.67", and the mounting hole distance is 30mm / 1.18". Please compare the chain size, tooth count, shaft size, hole distance, and product photos with your original sprocket before ordering.

Product Compatibility

Vehicle Type Compatible Application
Pit Bike 50cc / 70cc / 90cc / 110cc / 125cc / 140cc / 150cc
Dirt Bike Compatible models using 420 chain and 17mm front sprocket shaft
Motorcycle Small engine models when sprocket size matches
ATV / Quad Compatible models using 420-12T front sprocket setup

⚠️ This is a size-specific front sprocket. Please confirm your original sprocket uses a 420 chain, 12-tooth design, 17mm inner diameter, and matching mounting hole distance before purchase.

Specifications

Item Details
Product Type Front Drive Sprocket
Chain Size 420
Tooth Count 12T
Inner Diameter 17mm / 0.67"
Mounting Hole Distance 30mm / 1.18"
Material Heat-Treated Steel
Compatible Engine Sizes 50cc / 70cc / 90cc / 110cc / 125cc / 140cc / 150cc
Application Pit Bike / Dirt Bike / Motorcycle / ATV
Package Includes 1 × Front Sprocket, Holder and Bolts
Condition 100% Brand New

Key Features

  • 420-12T front sprocket for 50cc-150cc pit bikes, dirt bikes, motorcycles, and ATVs
  • 17mm inner diameter for compatible front drive shaft applications
  • 30mm mounting hole distance for size matching
  • Heat-treated steel construction helps improve wear resistance and durability
  • Includes sprocket holder and bolts for convenient replacement installation
View full details

Fitment FAQ

Will this part fit my specific model and year?

This 420-12T front sprocket may fit many 50cc, 70cc, 90cc, 110cc, 125cc, 140cc, and 150cc pit bikes, dirt bikes, motorcycles, and ATVs. Fitment depends on the chain size, tooth count, inner diameter, mounting hole distance, and front drive shaft design rather than model year alone.

Do I need to match the OEM part number?

Matching the OEM part number is helpful, but for this type of front sprocket, the key details are the 420 chain size, 12-tooth design, 17mm inner diameter, and 30mm mounting hole distance. Please compare these measurements with your original sprocket before ordering.

What models or situations does this part not fit?

This sprocket may not fit vehicles using a different chain size, different tooth count, different shaft diameter, different mounting hole spacing, or a non-compatible front sprocket holder design. It is not suitable if your original sprocket does not match the 420-12T and 17mm specifications.

What should I check before ordering?

Before ordering, check your original sprocket chain size, tooth count, inner diameter, mounting hole distance, drive shaft size, sprocket holder style, and product photos. This product is a 420 chain, 12T front sprocket with a 17mm inner diameter and 30mm hole distance.