Royal enfield thunderbird is a old bike. Every part of it is hand built, so the accuracy is not good. The vibrate a lot and cannot go fast.
They are old school bikes with un-refined engines. U can even feel the vibrations of engine on handle bar. The milage offered is also low. The maintainance of this bike is also high. U ride for some kilometers and see oil leaking .
It is a heavy bike. Very hard to handle in bumper to bumper traffic. It comes with spoked wheels and tube tyres. One small nail and u will be stranded. U have to gather all ur energy to move that 200+ kgs of metal to repair shop.