A Few Points Before You Get Started
Your goal? Modify your seat so that it's as comfortable as possible for YOU. Our bodies, riding styles, bike ergonomics and bike mods are different, and each will affect your approach to improving your seat comfort. Experiment with the suggestions on this site to find the modifications that work best for you.
Knowing how to do this for yourself not only can be personally satisfying, but can save you a bundle of money. Aftermarket seats can easily cost $400. If an aftermarket seat works for you and you don't mind spending that kind of money, they certainly can be really nice, well made products.
Personally, I haven't been willing to spend $300-$500, pretty much knowing I would most likely need to tweak it (given my history with seats and pain). I'd rather pay far less to customize my seat for my unique body, riding style, bike setup... and know how to tweak it again and again if needed.
I'm aware that my modified seat may not look as nice as the more expensive, nicely upholstered aftermarket seats. This is how I dealt with that, at least so far:
- My bike is to be ridden, not shown or stored. So anything that keeps me from riding more and longer is something that needs to be fixed.
- When I'm riding my bike, nobody can see the seat anyway.
- If I really want to have that customized, fancy look, I'll take the seat to an upholsterer, but only after I get it shaped and foamed just right.
- When I have more money to burn, and I really want to try an aftermarket seat, maybe I'll give one a try... but as a matter of self-reliance, I still want to understand how to modify my own seat.
So let's get to the nuts and bolts. Learn about removing the cover to get at the guts, understanding the basics of seat comfort, removing and adding foam for shape and comfort, re-installing the seat cover, some other ideas, and more.
Not to belabor the point, but... take your time, be patient, and assume that you'll probably have to take some test rides and tweak your work a few times to get it just right for you.
Have at it! Have fun!