Minibikes
2021Thumpstar TSX 125
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The 2021 Thumpstar TSX 125 is a pit bike for young riders and adults having fun off-road. Its 125cc four-stroke single drives through a four-speed gearbox, for a top speed of about 90 km/h. An 830 mm seat, 80 kg dry weight and 3.4-litre tank keep it light and easy to throw around.
- Capacity
- 125.0 ccm
- Engine
- Single, four-stroke
- Gearbox
- 4-speed
- Dry weight
- 80.0 kg
- Seat height
- 830 mm
- Power
- 15.0 HP (11.0 kW)
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Designed for casual dirt riding, paddock bashing, and learning motocross fundamentals rather than any road use.
- Built for
- A playful, low-powered pit bike with a simple carbureted single-cylinder engine and basic suspension geared toward fun over performance.
- Not ideal for
- Not for anyone wanting highway speeds, long-distance travel, or carrying a passenger, as it lacks the power, top speed, and comfort for those roles.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Engine
- Capacity
- 125.0 ccm
- Power
- 15.0 HP (11.0 kW)
- Engine type
- Single, four-stroke
- Power/weight ratio
- 0.1875 HP/kg (dry)
- Fuel system
- Carburettor
- Starting
- Kick
Transmission
- Gearbox
- 4-speed
- Transmission type
- Manual
Performance
- Top speed
- 90.0 km/h (55.9 mph)
Dimensions & weight
- Wheelbase
- 1260 mm
- Seat height
- 830 mm
- Dry weight
- 80.0 kg
- Fuel capacity
- 3.40 litres
Chassis & suspension
- Frame
- Tri-Bar
- Front suspension
- Inverted Telescopic
- Rear suspension
- VS 1 Linkage U Shock
Brakes & wheels
- Front brakes
- Single disc. Dual piston hydraulic disc
- Front brakes diameter
- 220 mm
- Rear brakes
- Single disc. HSK Single Piston
- Front tyre
- 70/100-14
- Rear tyre
- 80/100-12
Other
- Color options
- Green/Black
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 2020 | 2021 | 2022 |
|---|---|---|---|
| Capacity | 125 cc | 125 cc | 125 cc |
| Dry weight | 80 kg | 80 kg | 80 kg |
| Seat height | 830 mm | 830 mm | 830 mm |
| Fuel capacity | 3.4 L | 3.4 L | 3.4 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the Thumpstar TSX 125?
The 2021 Thumpstar TSX 125 has a Capacity of 125.0 ccm (7.63 cubic inches).
What engine power does the Thumpstar TSX 125 have?
The 2021 Thumpstar TSX 125 has a Power of 15.0 HP (11.0 kW).
How many gears does the Thumpstar TSX 125 have?
The 2021 Thumpstar TSX 125 has a Gearbox of 4-speed.
How much does the Thumpstar TSX 125 weigh?
The 2021 Thumpstar TSX 125 has a Dry weight of 80.0 kg (176.4 pounds).
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