The KTM RC 250 and 2017 KTM 150 SX are lightweight single-cylinder motorcycles intended for entirely different tracks. The RC 250 is a street-legal, fully faired sportbike sold in Japan and several Asian markets. The 150 SX is a competition motocross motorcycle built for closed-course off-road riding, with no road equipment and no interest in making the morning commute less conspicuous.
RC 250 and 150 SX Specification Comparison
| Specification | KTM RC 250 | 2017 KTM 150 SX |
|---|---|---|
| Engine | 248.8 cc liquid-cooled four-stroke single | 143.99 cc liquid-cooled two-stroke single |
| Fuel system | Electronic fuel injection | 38 mm carburetor |
| Transmission | 6-speed | 6-speed |
| Starting | Electric | Kick |
| Claimed output | 23 kW (31 PS) | Not officially emphasized in KTM’s published specifications |
| Dry weight | 147 kg | Approximately 87.2 kg |
| Seat height | 820 mm | Approximately 960 mm |
| Wheels | 17-inch road wheels | 21-inch front and 19-inch rear motocross wheels |
| Road legality | Road model | Closed-course competition model |
Choosing Between Two Very Different KTMs
The RC 250 is the practical choice for paved roads. Its fuel-injected engine, anti-hopping clutch, two-channel ABS, lights and instruments make it usable as everyday transport while retaining a committed sportbike appearance. The fairing and clip-on-style controls favor fast road riding over rough terrain.
The 150 SX is dramatically lighter and purpose-built for motocross. Its two-stroke engine, WP AER 48 fork, long suspension travel and narrow chassis are designed around jumps, ruts and rapid direction changes. It requires premixed or separately measured two-stroke lubrication procedures specified by KTM, along with maintenance intervals based on operating hours rather than leisurely calendar optimism.
Choose the RC 250 for road riding and track days on pavement. Choose the 150 SX only for motocross or private off-road facilities. A used 150 SX should be inspected for engine hours, piston service, wheel condition and suspension leaks; an RC 250 deserves checks of its fairings, ABS system and evidence of low-speed drops.
