Nowadays, you should consider biking in Kathmandu as OUT, it is simply too polluted and dangerous. There ae some good routes out of the city centre and into the surrounding countryside/ridges, but as a city mode of transport, forget it.
A rickshaw from Thamel asked me 200 ruppes to give me a ride to Pashupatinath, but we bargained down to 120 Nr.
During the 30 minutes ride in heavy traffic, most of it easy but nevertheless with some hard times cycling uphill, I was thinking at the irony of the whole thing – the rickshaw man was as thin as a stick, he only had sandals and not sneakers, and was working hard to earn his living, taking western fat-asses to see the place where, if lucky and his family will have 20 euros to spend, he’ll get cremated in the next 20 years or so. Needless to say, I felt guilty enough to end up giving 200 rupees to that poor soul.
While you are in kathmandu .......and do not forget to ride bicyle......trip......kathmandu to nagarkot......it is really fun and great adventure...