I have been riding in Chengdu, China, for 34 weeks now, and have covered 3500 km, and have never had a puncture.

I was using standard Giant tyres and tubes for a while, but a couple of weeks ago I changed the tyres for some 1.5" ones. I have no kevlar inserts.

When I rode in Hobart, Australia for a couple of years, I got 4 punctures in my first 1500 km, and went out and bought kevlar liners for the wheels. After that I got none.

I think the lack of punctures I get in China is due to the armies of orange overalled street sweepers that clean the roads in the wee hours of the morning.

How often do you get punctures, and if you get none, why do you think this is so?

z