Minimum insertion on a Moots layback post

[DRZRM]

I sort of remember this being 2.5 inches into the frame, is that right? Moots has no minimum insertion line.

[DRietz]

Might this be the polished puppy I sent you?

Essentially, the basic rule of seat post insertion is that you want enough seatpost inserted so that it goes past (not necessarily by a lot) the TT/ST junction. This buttresses the seatpost, giving you enough stability. On old lugged frames that rarely had more than a centimeter of seat tube showing above the TT, 1.5inches could feasibly do it. 2 makes me more confident.

[DRZRM]

I actually have 2 that are in the 2.5 to 3" range, both make it through the top tube, but just. Both are on steel bikes thought, so I worry a bit less. I just wanted to check.

[Peter B]

IIRC stock or fresh Moots ti posts show a line in the shaft between the blasted shaft and brushed insertion section. 2 to 2-1/2' should be sufficient unless you are >6'-2" and pushing 240.

[cat6]

"just the tip"

[DRZRM]

Hmmm...6'3", 225. That blasted line is entirely inside the frame, do I need to assume more post inside due to my massive stature?

IIRC stock or fresh Moots ti posts show a line in the shaft between the blasted shaft and brushed insertion section. 2 to 2-1/2' should be sufficient unless you are >6'-2" and pushing 240.

[oldpotatoe]

I sort of remember this being 2.5 inches into the frame, is that right? Moots has no minimum insertion line.

'General' rule of thumb is twice the top tube width, below the bottom of the top tube/seat tube junction, for the end of the seat post.

[DRZRM]

Hmmm, thanks Peter, looks like I need to run a WTT post for my 220 length laybacks, anyone running a 280 or 340 who doesn't need the length, I'll pay all shipping.

[akelman]

Zach, will the Moots post accommodate oversized and/or ovalized saddle rails?

[DRZRM]

Not sure, anyone? What saddle? I'll look into it.

[happycampyer]

Zach, will the Moots post accommodate oversized and/or ovalized saddle rails?The Moots posts are designed for 7mm round rails only.