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So how much seat post is TOO much seat post?(6 posts)

So how much seat post is TOO much seat post?Crank Yanker
Jan 26, 2004 7:56 PM
Given the amount of "seatpost" discussions today, here's another bone to chew....at what point does the trade-off between "smaller frame/longer post" and "reduced ride quality/structural integrity" become an issue?

Given the "compact frame love" that's going around today, it seems like everyone is showing a lot more 'post these days. It's a given that the Pro's always ride much smaller bikes than the rest of us, but even the tall guys(Hincapie, Jan, Millar) still have to fit on those tiny frames and many of them show a good 28-30cm(almost a foot for the metrically challenged).

So (IYHO), how much post is too much, and is there a rule of thumb that I've somehow forgotten over how much post should show based on a particular frame size to still be "safe" (not to mention aesthetic)?!

To lessen the bickering over what frame will give you a better feel/ridigity, let's just say we're talking a compact aluminum/carbon-stay frame a la 75% of what's out there today.
no such rule...C-40
Jan 26, 2004 9:27 PM
As long as you stay below the max. height line on a 350mm post, there should not be an integrity problem. May look weird and require a huge amount of steering tube spacer and/or high rise stem, with a frame that small.

Recently saw a tall guy riding a much too small Trek Y-foil with what appeared to be a one-piece custom steering tube spacer that had to be 100mm (4 inches)in length. The bike was setup with aero bars, apparently as a TT bike. Looked pretty stupid, but he was climbing the mountain faster than me, so what could I say?

Usually a too-short head tube becomes a problem before the seatpost length.
ever ride a mtb?shopclass69
Jan 27, 2004 7:09 AM
ever go for a mountain bike ride or at least look at a mtb?
The main thing would be optimum fit. My road bike looks more like my mtb more and more with the sloping top tube, but again, it all comes down to fit.
if your ankles bonk your TT when you sprint.... (nm)funknuggets
Jan 27, 2004 8:59 AM
In the old days, they used to say no more than a fistfulCory
Jan 27, 2004 9:20 AM
Nobody pays any attention to this anymore, but when I started cycling in the early '70s, one rule was that you should have no more than a fistful of post showing. Close your hand around the post with your little finger at the top of the seat tube, and your fist should cover the whole exposed section of post. EVERYBODY'S bike is smaller than that now. For what it's worth, though, my Atlantis is almost that big, and it's by far the most comfortable fit I've had on a bike.
I believe most frames back then were squarecyclopathic
Jan 27, 2004 11:00 AM
C-t-C was the same as TT, so the rule was somewhat important. Most US/Taiwan frames have longer TT nowdays. Also leather saddles had higher rails then most mordern saddles, you'd need to add an 1/2-1".