Originally Posted by Gryphon12
New Duke 390 has extensive use of alloy, including light wheels & brakes (unsprung weight), and as a thumper weighs 324 lbs. wet. The new Ninja 300R twin doesn't have these advantages and weighs 378 lbs. wet. It would take a pretty high-tech (I want one!) 500 Twin to hold the weight down to 350 lbs. wet.
Another reference point: The 2012 (higher-tech) Duke 690 thumper weighs 352 lbs. wet. I think 385 lbs. would be a better target for a twin, which is still 40 lbs. lighter than my NT650 Hawk GT (425 lbs. wet). Going back to another thread, the Japan-only 400cc super-sports barely make the 385 lb. target.
What's so much heavier on a road bike like the Duke 390? As an comparison, a DRZ400S only weighs a bit under 320 lbs and it's nearing dinosaur age.