Trailmaster TM21 Dirt Bike 125cc – Semi Automatic

TrailMaster TM21 Semi-Automatic Dirt Bike

The TrailMaster TM21 is a youth-size off-road dirt bike listed under SKU TM21-DIRT-BIKE. The marketing copy uses 125cc, while the stored technical table lists 124 mL displacement; confirm the physical engine label and current TrailMaster documentation before relying on the rounded displacement figure. The stored specifications also identify 8.3 hp, a four-speed semi-automatic N-1-2-3-4 transmission with automatic clutch, kick start, hydraulic front and rear disc brakes, 14-inch front and 12-inch rear tires and a 29.13-inch seat height.

Browse related models in our Dirt Bikes category. For manufacturer information, visit the TrailMaster website. Rider suitability should be confirmed from current manufacturer guidance, rider size, experience, supervision needs and protective-equipment requirements.

The TM 21-125 features a 4-speed semi-automatic transmission, allowing riders to shift gears smoothly without the need for a clutch. Front and rear hydraulic disc brakes provide reliable stopping power, enhancing safety on any terrain. The bike’s heavy-duty frame, paired with full motocross ergonomics and a race suspension system, ensures a comfortable and controlled ride, even over rough terrain.

The electronic CDI ignition system makes kick starting effortless and ensures smooth performance across all gears, providing a broad and even power band. With a 41.54” wheelbase, 14” front tire, and 12” rear tire, the TM 21-125 is built for durability and stability, making it a top seller in its category.

Available in vibrant red, blue, green, and orange, the TM 21-125 not only delivers in performance but also stands out in style.

Key Features:

• Powerful 125cc 4-stroke engine with 8.3 HP
• Kick start with automatic clutch and semi-automatic transmission
• 41.54” wheelbase and 29.13” seat height
• 14” front tire / 12” rear tire
• Hydraulic front and rear disc brakes
• Aluminum handlebar for enhanced control