Seat post safe depth?

  • Regarding bumping ads in the classifed forums, we've just installed a new (customized) add-on that will change the way ads are bumped to the top. Please refer to the post "Bumping Classifed Ads" for details.
Most Recent BUY IT NOW Items Listed on eBay
eBay Auction Picture
eBay Auction Picture
eBay Auction Picture
eBay Auction Picture
eBay Auction Picture
eBay Auction Picture
eBay Auction Picture
eBay Auction Picture
eBay Auction Picture
eBay Auction Picture
eBay Auction Picture
eBay Auction Picture
eBay Auction Picture
eBay Auction Picture
eBay Auction Picture
eBay Auction Picture
eBay Auction Picture
eBay Auction Picture
These ads go away when you register for an account!

Ernbar

Finally riding a big boys bike
Jul 12, 2019
384
66
Central Florida
I posted this on the wrong forum so my question is is this mark the "safe" max line I can extend up my seat post? Usually one sees a stamped lettered warning but this post has no other markings except the line. The length from the line to the bottom of the post is 2 1/2". Thanks!
1111211
 
Last edited:

Mr. Monkeyarms

I live for the CABE
Oct 30, 2018
1,370
Colorado
Sounds about right. I usually want enough seatpost in the seat tube inserted to make it past the bottom of the top tube for strength. Otherwise the seat post is a lever and the top of the seat tube is the fulcrum.
 

Ernbar

Finally riding a big boys bike
Jul 12, 2019
384
66
Central Florida
Thought I had attached a picture so it’s done now.
 

AndyA

Finally riding a big boys bike
Nov 24, 2017
204
72
bergen county
Out of curiosity, I went to the box of spare seat posts and measured the ones with insert marks. Most were at 2-1/2". A few were deeper, the deepest being 3".
 
  • Like
Reactions: Ernbar

GTs58

I'm the Wiz, and nobody beats me!
Sep 2, 2012
12,620
Central Arizona
Out of curiosity, I went to the box of spare seat posts and measured the ones with insert marks. Most were at 2-1/2". A few were deeper, the deepest being 3".
Most all my bikes have unmarked seat posts and I leave a minimum of 2.25"-2.5" in the seat tube.
 

morton

I live for the CABE
Nov 9, 2007
1,689
York, United States
Never less than the line indicates, but deeper dpending upon the weight of the rider, the quality of the bike, material of which it is made and the type of bike. A 110 pound man using his Varsity as a cruiser would be hardpressed to cause damage at even a bit above minimum. A 220 pounder riding an aluminum wally world mountain bike (sic) thru rough trails would be well advised to insert as close to the bottom bracket as possible. :)

I agree with Mrmonkeyarms that below the top tube is a good rule of thumb. Just remember that the more seatpost exposed the stronger the leverage action and likelihood of damage.
 
This ad goes away when you register for an account!