Triumph Thruxton 400 Vs KTM 390 Duke Spec Comparison: What's Different?

The 400cc motorcycle segment in India has seen strong growth, with brands offering machines that appeal to very different riding tastes. The Triumph Thruxton 400 enters as a modern interpretation of a classic cafe racer, blending retro styling with contemporary engineering for riders who prefer a more laid-back yet sporty approach. In contrast, the KTM 390 Duke is firmly positioned in the streetfighter or sport naked category, aimed at those who want aggressive styling, sharp handling and high-tech rider aids. Here’s a detailed spec comparison to understand how they stack up against each other.

Both motorcycles feature single-cylinder, liquid-cooled, DOHC engines with nearly identical displacements: 398cc for the Triumph and 398.63cc for the KTM. On paper, the KTM delivers higher output at 45.3 bhp produced at 8,500 rpm and 39 Nm of torque at 6,500 rpm mated to a 6 speed gearbox with a bi-directional quickshifter, while the Triumph offers 41.4 bhp at 9,000 rpm and 37.5 Nm at 7,500 rpm mated to a 6-speed gearbox with a torque-assist slip clutch . Both use Bosch electronic fuel injection, though the KTM’s compression ratio is slightly higher at 12.71:1 compared to the Triumph’s 12:1.

The Triumph Thruxton 400 sits on a hybrid spine/perimeter tubular steel frame with a bolt-on rear subframe. Suspension duties are handled by 43 mm upside-down Big Piston forks at the front and a gas-charged monoshock with an external reservoir at the rear. In comparison, the KTM 390 Duke employs a split-trellis frame with an aluminium cast subframe, paired with WP APEX 43 mm USD forks that allow compression and rebound adjustment and an adjustable WP APEX monoshock at the rear. The KTM’s suspension offers more tuning options, appealing to riders who prefer fine adjustments for varying riding conditions.

In terms of braking, both the motorcycles have different hardware in terms of both size and features. The Triumph comes with a 300 mm front disc paired with a four-piston radial caliper, and a 230 mm rear disc, both supported by dual-channel ABS. The KTM features a larger 320 mm front disc with radial caliper and a 240 mm rear disc, with the added advantage of cornering ABS thanks to its six-axis IMU. Both motorcycles ride on 17-inch alloy wheels, with the Triumph using 110/70 section tyres at the front and 150/60 section tyres at the rear, while the KTM’s tyre sizes are similar but paired with slightly sportier profiles.

In terms of size and mass, the Triumph Thruxton 400 has a wet weight of 181 kg, a seat height of 805 mm, a wheelbase of 1,371 mm, and a fuel tank capacity of 13 litres. The KTM 390 Duke has 168.3 kg kerb weight and offers an adjustable seat height of 800 or 820 mm. It also comes with a larger 15-litre fuel tank and a higher ground clearance of 183 mm.

The KTM 390 Duke leads in electronic rider aids and tech equipment. It comes with multiple riding modes including Street, Rain and Track, launch control, cornering ABS, traction control, SuperMoto ABS, a quickshifter+ and a 5-inch TFT display with a Type-C charging port. The Triumph Thruxton 400 offers modern essentials like ride-by-wire throttle, switchable traction control, torque-assist clutch and ABS, displayed through an analogue speedometer integrated with a multifunction LCD screen.

The Triumph Thruxton 400 is priced at Rs 2.74 lakh (ex-showroom), making it slightly more affordable than the KTM 390 Duke, which starts at Rs 2.96 lakh (ex-showroom). While the difference is not large, it could play a role for buyers choosing between retro styling and modern streetfighter aggression.