ZTDZZH 53-Tooth Rear Sprocket for 420 Chain — 76mm ID Steel Replacement for 50–250cc Pit Bikes & ATVs, Durable OEM-Style

ZTDZZH's 53-tooth rear sprocket is a direct-replacement steel sprocket with a 76 mm inner diameter designed for 420 chain drive systems on 50cc–250cc pit bikes and ATVs.

This sprocket is intended as a sturdy, OEM-style replacement for bikes and quads that use a 420 chain. Manufactured to common pit-bike dimensions, it balances durability and predictable gearing so you can restore stock performance or slightly alter final drive ratio for riding needs. Before installation, confirm your vehicle's mounting pattern and chain specification to ensure compatibility.

Will this sprocket fit my bike or ATV?

Most pit bikes and small-displacement ATVs that accept a 420 chain and use a 76 mm inner hub will accept this sprocket. Check the physical measurements on your hub and the bolt hole spacing to confirm a match. If your motorcycle lists a 53-tooth rear sprocket as a compatible size, this unit will typically work.

• Compatible with 420 roller chain systems
• Inner diameter (ID): 76 mm for hub fit
• Center hole diameter: 92 mm (3.62") to reference hub alignment
• Bolt/screw hole diameter: 8.5 mm (0.33") for mounting hardware

How does changing to a 53-tooth sprocket affect performance?

Switching to a larger rear sprocket increases torque at the rear wheel and lowers top speed slightly compared with smaller rear sprockets. That means stronger acceleration and easier low-speed control on technical trails or towing. Choose this if you want more low-end pull rather than marginal top-end gains.

• More teeth = increased drivetrain leverage and acceleration
• Small trade-off in maximum speed for improved low-speed throttle response
• Works well on loose terrain, trails, and utility riding

What are the precise dimensions and mounting details?

This sprocket’s key measurements are provided so you can verify fitment against your wheel hub and swingarm. The inside diameter that seats on the hub is 76 mm while the main center opening measures approximately 92 mm. Mounting holes are sized for bolts with roughly 8.5 mm diameter—confirm bolt pattern and thread size on your machine.

• 53 teeth counted around outer pitch
• Inner hub seat (ID): 76 mm
• Center hole (reference): 92 mm / 3.62"
• Mount screw hole diameter: 8.5 mm (0.33")

How should I install and maintain the sprocket?

Installation requires basic hand tools and attention to torque specifications for the mounting bolts; always consult your vehicle service manual. After mounting, align chain and check tension, then run and re-torque bolts. Routine lubrication and chain inspection extend sprocket life and promote smooth operation.

• Use correct bolt torque and thread engagement per your manual
• Set chain tension to manufacturer recommendations
• Lubricate chain regularly and inspect for wear or tight links
• Replace chain and sprockets as a matched set when worn

Who is this for: The ZTDZZH 53-tooth sprocket is aimed at riders and mechanics servicing small-displacement dirt bikes, pit bikes, quads, and utility ATVs (50cc–250cc) that run 420 chain. It's a practical option for those repairing a damaged rear sprocket, adjusting final drive for better acceleration, or keeping a budget-friendly spare on hand. Verify your hub dimensions and bolt pattern before purchase to ensure a correct fit.