AOIT 420 Motorcycle Chain 132-Link Kit — 1/2" Pitch Roller Chain for 50–212cc Mini Bikes & ATVs, Alloy Steel with Chain Breaker

AOIT 420 Motorcycle Chain is a heavy-duty 132-link roller chain kit that fits 50–212cc mini bikes, go-karts and small ATVs and includes a master link plus a chain breaker for precise length adjustment.

This 420-size chain is engineered for small-engine vehicles—pit bikes, dirt bikes, scooters, Chinese ATVs and mini go-karts—requiring a compact, durable drivetrain component. Constructed from upgraded alloy steel with pre-stretched, shot-peened parts and solid rollers, the chain balances strength and wear resistance while delivering an accessible, easy-to-install kit that arrives ready to size and secure.

What are the key specifications I should check before buying?

Confirm compatibility with your vehicle’s sprockets and required chain length. This AOIT chain has a 1/2" pitch and 1/2" roller width with a roller diameter of 5/16" and comes as 132 links—ample length for most small-engine setups that can be shortened with the included tools.

• Chain pitch: 1/2" (420 standard)
• Roller width: 1/2"; roller diameter: 5/16"
• Total links: 132 (cuttable to fit)
• Tensile strength: approximately 4,300 lbs

How do I size and install this chain on my mini bike or ATV?

The kit includes a master link and a compatible chain breaker so you can remove excess links and reconnect the chain to the correct length. Installation requires aligning the chain on the sprockets, using the breaker to remove links, inserting the master link, and clearing proper tension—standard tasks for a DIY mechanic or service shop.

• Use the supplied 420–530-compatible chain breaker to remove links
• Fit the master link and clip or rivet according to your vehicle’s recommendation
• Set rear axle position to achieve correct chain tension and recheck after short ride

How durable and reliable is the AOIT 420 roller chain?

AOIT builds this chain from upgraded alloy steel and applies pre-stretching and shot-peening processes to reduce early elongation and surface fatigue. With solid rollers and either two- or reinforced rivet construction, the chain is designed to handle the loads typical of 50–212cc drivetrains while resisting corrosion and wear.

• Upgraded alloy steel construction for improved strength
• Pre-stretched, shot-peened components to limit initial stretch
• Solid rollers and secure riveting for extended service life

What comes in the box and what additional parts might I need?

The package contains one 132-link roller chain, a master link, a chain breaker tool suitable for 420–530 chains, and ten spare 420 connector links for repairs or multiple reconnections. You may only need basic hand tools—wrenches and pliers—or a shop rivet press if your vehicle’s connection method uses riveted links.

• Included: 1× 132-link 420 roller chain, 1× master link
• Included: 1× chain breaker (420–530 compatible) and 10× connector links
• Possible extras: replacement sprockets, rivet tool, lubricant

Who is this for: Riders, hobbyists and small-vehicle mechanics who need a robust, ready-to-size replacement chain for mini bikes, pit bikes, go-karts, scooters and Chinese ATVs. Choose this AOIT 420 chain if you want a pretreated alloy-steel roller chain that arrives with the links and tools to shorten and secure it, offering practical strength for everyday off-road and recreational use.