The problem with seatpost shocks is that they don't hold up very long
with muni abuse. Muni puts a lot of twisting forces on the seat and the
seatpost shocks aren't designed for that. They're designed with bike
use in mind where there are very little twisting forces.
On a muni when you turn you put twisting forces on the saddle. When you
pull up on the handle you put upwards and twisting forces on the saddle.
When you crash the seat hits the ground (sometimes rather hard) and
puts unusual forces on the seatpost. Seatpost shocks don't deal with
those forces very well. You end up needing to rebuild, or repair, or
replace the seatpost shock frequently.
Telescoping seatpost shocks, like the Rock Shox and Pyramid, are also
quite long. You have to be quite tall to be able to use them
unmodified. Most people would need to cut them shorter, but in order to
do that you have to take the seatpost apart, modify the insides so it
works in a shorter space, and then put it back together. That's a lot
of work for a seatpost that is going to have a limited lifetime.
The Thudbuster seatpost shocks are an alternative. They may hold up
better than the telescoping style, but they still will wear out and
break due to muni abuse. You also still have to be tall enough to fit
it. They also don't move straight down. They move backwards as they
compress.
The best suspension seems to be a good air pillow in the saddle. I call
it air suspension.
--
john_childs - Guinness Mojo
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