
So finally I got Hero Hawk. It's light, fast, single gear ratio, no springs and no problems so far.
Yesterday I managed to cycle from my home to Vile Parle (E), market, Dinanath Mangeshkar Natyagraha.
(Photo Source: http://herocycles.com/boyz.php)
I was wondering how much power do I produce when riding the bicycle and how I can measure it. I need to measure crank rpms and torque. For time being I have following figure showing typical power produced by cyclists.

(Image Source: http://users.frii.com/katana/biketext.html)
According to article at above URL, you need multiple gear ratios to deal with different slopes.