Originally Posted by
cubewheels
Some does it to reduce rolling resistance to a minimum which ironically doesn't always work as intended.
For any sort of bumpy surface, such practice would even slow you down as greater magnitude of shocks are transmitted to the frame and the rider. Our bodies is definitely not as efficient as tires in absorbing road shocks
I am aware of what some people do regarding tire pressure. I was speaking to the OP's issue of a harsh ride. Most likely his tires are over inflated. It simply one thing to check. Even putting wider tires on the bike won't help if the OP pumps the tires up to the max pressure shown on the sidewall, they will still get a harsh ride.
But hey, throw money at the problem.