They aren't cheap, but look for Thudbuster seatposts, from the mountain bike world. Most suspension posts (telescoping) don't even move much unless you are heavy or with backpack. The thudbuster is customizeable and rotates in an arc. Some hardtail fans use them for the roughest courses, then put the standard seatpost back on for races or general riding.
There are several different models. Some use a big square elastomer, and some use a stack of 2 elastomers in a "shock". They are expensive, maybe $70-150. But what's back surgery cost?
Originally Posted by miked826
FREEDOM! Talkin' bout FREEDOM.
Freedom from gas prices, insurance, registration, buses, trains, cars, pedaling, parking meters and gridlock.
I just wish I had some rear suspension on my bike. Potholes are a spine killer on my bike.