Austrian motorcycle manufacturer KTM released a slew of models for its KTM SX bike during the 2005 model year. There were nine in total, falling under two categories. The SX 50 Pro Junior LC and SX 50 Pro Senior LC (which comprise the SX 50 Series); SX 65; and SX 85 series, which are split into two sub-models based on the size of their wheels – 17/14 and 19/16 – are designated as youth bikes, which are ideal for the entry-level rider. The SX 125, SX 250, SX 450 Racing, and SX 525 Racing are classified as off-road bikes, meaning that they are better-suited SX models for racing circuits or riding on unpaved roads.
Each 2005 KTM SX is powered by a liquid-cooled single-cylinder engine. The two-stroke version goes on the SX 50 Series, while the four-stroke version goes on the other models. Moreover, each model is named after the displacement of its engine, which is represented by a rounded-up numerical estimation. For instance, the SX 525, which has the biggest engine of them all, is named after its engine displacement of 510.4 cubic centimeters.
Each 2005 KTM SX engine is fueled by a carburetor, which varies by make and size depending on model. The SX 50 Series are the only models that use an automatic transmission; all others use a manual gearbox. The 2005 SX uses an all-wheel disc braking system for its stopping power – the more advanced the model, the bigger the disc size. Wheels are made of aluminum, regardless of model; sizes vary widely, though.
Like other KTM bikes, all models of the 2005 KTM SX – except the SX 50 Series – use a high-quality chromium-molybdenum frame; the SX 50-Series models have steel ones instead. They also lack the fork guards on the other trims. The manufacturer’s suggested retail price of the 2005 SX ranges from $2,998 for the SX 50 Pro Junior LC to $6,798 for the SX 525.