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I scored a BF at a garage sale today on the cheap. Works perfect, Got lucky with the springs and diameter. Makes a huge difference. I learned that thudbusters take shock loads but the BF when adjusted correctly keeps your seat "floating" with the spring tension. Hence the name Body Float.

Did that today with my Mitutoyo's. It's a carbon seatpost and the numbers were all over the place. Went from 31.4 to 31.7 depending on where I took the reading! Oh what fun. Too lazy to pull the post and measure the ID of the tube. Since I haven't seen a seat post offered in a 31.8 I guess it...

What diameter post are you getting? I thought the ST1 diameter was 31.8 and I only see 31.6 available in the thudbuster. Thanks