Join Date: Mar 2003
Location: Grand Prairie, TX
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My advice is not to worry about it much--unless she does. You don't HAVE to have a suspension seatpost on the back of a tandem, many stokers prefer not to have one, and prior to the early '90's suspension seatposts were either nonexistent or very scarce. Make sure you call out the bumps.
If you are only a little bit too high, there might be things you can do:
1) Not all saddles are of the same height between the rails and the top of the saddle. Get one lower than you have, and you might be low enough.
2) Not all suspension seatposts require the same amount of space between the top of the seat tube, and the saddle rails. Look for one that requires less (vertical) space. Don't be turned off by cheap posts (which also often do not have much travel and are therefore perhaps what you need). I haven't tried one of the parallelogram posts (Thudbuster), or spoken at length to somebody who has, but of the straight-up-and-down posts, one of my favorites is a cheap Taiwan post, marketed under several names, including (shudder) Nashbar. Disassembly of this post found a spring and an elastomer and a preload adjusting nut, pretty much what you'd get on any post. It also has the typical low-end single-bolt-with-serrations seat rail clamp. This post requires no less than 3-5/8" between the top of the seat tube and the saddle rails.
The only problem I had with the post, was that we thought we could not get the preload up high enough for spirited riding with a 140-lb stoker. The elastomer seemed a little mushy, and it seemed like we couldn't increase the preload enough by turning in the nut, so we removed the elastomer and replaced it with a stack of (!) pennies. Aha, adjustable, high preload (more than with any off-the-rack suspension post I have tried). One of these days I've got to go back and replace the pennies with something lighter.
Have you done a curb stop yet? Curbside pedal up, unclip on that side, ride next to the curb and stop, and put a foot down on the curb, which is a lot higher than where the bottom of the tires are....good deal for the petite.