Minibikes
2008Derbi Dirt Boy 50
34 fields on record
The 2008 Derbi Dirt Boy 50 is a lightweight minibike designed for young riders and beginners seeking affordable off-road fun. Its simple air-cooled single-cylinder engine and automatic belt transmission make it easy to operate, while the compact frame suits tight trails and closed courses. Known for reliability and low maintenance, it represents an accessible entry point into dirt biking.
- Capacity
- 49.9 ccm
- Engine
- Single
- Gearbox
- 1-speed
- Dry weight
- 47.0 kg
- Seat height
- 610 mm
- Power
- 5.4 HP (4.0 kW)
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built as a small-wheeled minibike for casual backyard or off-road play riding rather than any competitive or commuting use.
- Built for
- A simple, single-speed automatic-feel minibike with a low-revving 50cc engine, offering easygoing, low-stakes fun rather than performance thrills.
- Not ideal for
- Not suitable for highway travel, touring, carrying passengers, or any rider seeking real speed or long-distance comfort.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Engine
- Capacity
- 49.9 ccm
- Power
- 5.4 HP (4.0 kW)
- Engine type
- Single
- Power/weight ratio
- 0.1149 HP/kg (dry)
- Bore x stroke
- 39.0 x 41.8 mm
- Compression
- 12.0:1
- Cooling system
- Air
- Fuel system
- Carburettor
- Starting
- Kick
- Ignition
- CDI
- Lubrication system
- Oil pump
Transmission
- Gearbox
- 1-speed
- Transmission type
- Manual
- Final drive
- Belt
Dimensions & weight
- Wheelbase
- 905 mm
- Overall length
- 1290 mm
- Overall width
- 815 mm
- Overall height
- 1260 mm
- Seat height
- 610 mm
- Dry weight
- 47.0 kg
- Fuel capacity
- 2.30 litres
- Oil capacity
- 0.60 litres
Chassis & suspension
- Front suspension
- Hydraulic fork. 120 mm travel
- Rear suspension
- Monoshock. 140 mm travel
- Front wheel travel
- 120 mm
- Rear wheel travel
- 140 mm
Brakes & wheels
- Front brakes
- Single disc
- Front brakes diameter
- 160 mm
- Rear brakes
- Expanding brake (drum brake)
- Rear brakes diameter
- 90 mm
- Front tyre
- 2.5-12
- Rear tyre
- 2.75-10
Other
- Color options
- Black/white
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 | 2008 | 2009 |
|---|---|---|
| Capacity | 50 cc | 50 cc |
| Dry weight | 47 kg | 47 kg |
| Seat height | 610 mm | 610 mm |
| Fuel capacity | 2.3 L | 2.3 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 Derbi Dirt Boy 50?
The 2008 Derbi Dirt Boy 50 has a Capacity of 49.9 ccm (3.05 cubic inches).
What engine power does the Derbi Dirt Boy 50 have?
The 2008 Derbi Dirt Boy 50 has a Power of 5.4 HP (4.0 kW).
How many gears does the Derbi Dirt Boy 50 have?
The 2008 Derbi Dirt Boy 50 has a Gearbox of 1-speed.
How much does the Derbi Dirt Boy 50 weigh?
The 2008 Derbi Dirt Boy 50 has a Dry weight of 47.0 kg (103.6 pounds).
Shop this bike
Affiliate linksWe may earn a commission from qualifying eBay or Amazon purchases made through these links. As an Amazon Associate I earn from qualifying purchases.
Please log in or register if you'd like to leave a comment.
Own one? Add it to My Garage and write an owner review with an Owner badge.