What is the difference in the 3G Thudbusters and the non 3G's? I see both for sale on Amazon.
I did exactly the same thing.Not sure about the difference, but if you're still researching make sure to check out the suntour ncx post as a value alternative. Rare in the US but can be purchased from Europe for around 70 to 80 bucks. Got mine from a German site and it arrived in a week.
I believe the OP's bike is a Specialized Turbo which requires a 30.9 mm seatpost. Unfortunately, both the Cirrus Body Float and Suntour NCX come only in 27.2 and 31.6 mm sizes, so a smaller (27.2 mm) post would have to be shimmed to work in the Turbo. Such shims are available here: http://www.jensonusa.com/!-eQPzHCvdjr!Bt!TcnD2vQ!/Proble-Solvers-Seatpost-Shim-Fits-272mm
The Thudbuster ST and LT are both available in 30.9 mm.
The BF comes in three versions, all have the same suspension, the difference is the post material.Where you getting it for $250? I thought they sell for almost $400.