The top speeds of these bikes can vary depending on various factors such as rider weight, road conditions, and aerodynamics.
KTM 250 Duke: The top speed of the KTM 250 Duke is typically claimed to be around 140-150 km/h (87-93 mph). However, actual speeds may vary.
KTM 390 Duke: The top speed of the KTM 390 Duke is generally stated to be around 160-170 km/h (99-105 mph). Again, actual speeds may differ based on the factors mentioned earlier.
It's important to note that these figures are approximate and can be influenced by various factors. Additionally, newer models and subsequent updates may have slightly different specifications. To obtain the most accurate and up-to-date information, it's best to consult official sources such as the KTM website or contact KTM directly.
Regarding performance in mountainous terrain, both the KTM 250 and 390 should have sufficient torque in lower RPM ranges to handle such conditions effectively. The Duke models are known for their agile handling and strong low-end torque, which can be advantageous in situations where high torque is required at lower RPMs, such as climbing steep inclines. However, the actual performance will still depend on rider skill, terrain, and specific riding conditions. It's always recommended to adapt your riding style and gear selection accordingly to ensure a safe and enjoyable experience in mountainous areas.