I wouldn't waste my time or money on a suspension seat post. I had a Specialized Expedition (my first bike as an adult) and it had one on it. Wider tires running lower pressure, or getting out of the saddle and using your legs is what. I would recommend..and if you feel like you need more, a sprung saddle. Brooks Flyer is a terrific one. It's not cheap, but properly taken care of will last decades and the leather will mold to your posterior, like a good pair of hiking boots mold to your feet.