Our Tamer suspension seatpost snapped in half during normal usage. I think it's a manufacturing defect but have had the bike 6 years so probably can't get satisfaction.

Anyway now I'm looking for a replacement. Have found that the bigger parallelogram-type models are too tall. We have an extra-large framed Santana Visa & my wife's only 5/7" so we probably have to stick with the traditional plunger type.

However, few seatposts are 29.8mm (yet another area where tandem parts tend to be different from solo bike parts). Any suggestions?

I'd hate to get another Tamer. Not happy with the pieces of their product that I'm now holding. Plus a dealer told me the new Tamer parallelogram-style post has a little pin that often breaks. I could get a normal-diameter post plus a shim, but that seems so klugy...