EOPOAYI 3.00-12 Rear Wheel Assembly for 110-125cc Dirt Bikes — 80/100-12 Knobby Tire, Disc Brake Kit

EOPOAYI 3.00-12 80/100-12 rear wheel assembly is a complete replacement rear wheel for many 110cc–125cc pit and mini dirt bikes designed for disc brake conversions and off-road durability.

This ready-to-install rear wheel kit bundles a 80/100-12 knobby tire, 3.00-12 rim, inner tube, brake rotor, sprocket, bearings and rim strip so you can swap a damaged or worn rear wheel in minutes. Built for trail use, the tire’s moderately sloped knobby tread and hard compound rubber balance longevity with reliable grip on dirt, mud and loose surfaces. Note: this assembly is made for disc brake setups and does not fit bikes with factory drum brakes unless converted.

Will this wheel fit my mini dirt bike?

The EOPOAYI 3.00-12 assembly fits many small-frame off-road bikes that accept a 12" rear wheel and a 12mm axle shaft. It’s compatible with a number of 110–125cc models and several youth motorcycles after confirming axle size and brake type.

• Wheel diameter: 12 inches (rim size 1.85x12)
• Axle shaft diameter: 12 mm — confirm your bike’s measurement
• Intended for bikes using rear disc brakes (not direct fit for drum brakes)
• Listed compatible platforms include SSR, TaoTao DB14, Coolster, and various small Yamaha/Kawasaki replica models

How does the tire perform off-road and in mixed conditions?

The 80/100-12 knobby tire uses a harder rubber compound and a stepped tread profile to provide stable traction across dirt, gravel, and packed trails while resisting accelerated wear. The tread is engineered to shed mud and maintain contact with uneven surfaces for predictable handling.

• Moderately sloped knobbies for traction without excessive drag
• Hard compound increases tread life for trail and recreational use
• Tread pattern designed to resist skidding and promote consistent cornering
• Works well on mixed loose and compacted terrain

What components are included and why are they useful?

This kit arrives as a full rear-wheel replacement so you avoid buying parts separately and dealing with fitting issues. Components are chosen to give a practical balance of strength, braking response and chain drive compatibility for most small off-road bikes after disc conversion.

• 1 x 80/100-12 Tire and 1 x 3.00-12 inner tube — ready to inflate and ride
• 1 x 1.85x12 rim with 2 bearings and rim strip for puncture protection
• 1 x brake disc (rotor) for faster braking response on disc systems
• 1 x 428 41T steel chain sprocket and mounting hardware for driveline fitment

How simple is installation and what should I check first?

Installation is straightforward if you have basic tools and a service stand: remove your old wheel assembly, transfer or confirm caliper and chain alignment, then mount this replacement unit. Always verify axle diameter, brake compatibility and sprocket alignment prior to final tightening.

• Swap the whole wheel assembly to avoid individual tire mounting tasks
• Confirm your bike uses a rear disc brake and a 12 mm axle shaft
• Check chain length and alignment after installing the 41T sprocket
• Torque axle and mounting bolts to manufacturer specifications

Who is this for: Riders, hobbyists and small-bike mechanics looking to replace a worn or damaged rear wheel on 110cc–125cc pit and mini dirt bikes who have converted (or will convert) to disc brakes. This kit suits trail riders who need a durable knobby tire, a quick swap solution, and all the essential components bundled for a single, efficient replacement. It’s not recommended for bikes that retain factory drum-brake rear hubs unless you plan to convert to a disc rotor setup.