Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

Is this seat post too high?

Old 06-21-13, 09:54 AM
  #1  
Jarrett2
Senior Member
Thread Starter
 
Jarrett2's Avatar
 
Join Date: May 2013
Location: DFW
Posts: 4,129

Bikes: Steel 1x's

Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 630 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Is this seat post too high?

I'm finding I have to really raise my seat up high to feel right on the bike. Is this post too high to be safe for a 350lber?

https://share.htc.com/5D-omADc5#slides/0
Jarrett2 is offline  
Old 06-21-13, 09:57 AM
  #2  
longbeachgary
Senior Member
 
longbeachgary's Avatar
 
Join Date: Sep 2008
Location: Beautiful Long Beach California
Posts: 3,605

Bikes: Eddy Merckx San Remo 76, Eddy Merckx San Remo 76 - Black Silver and Red, Eddy Merckx Sallanches 64 (2); Eddy Merckx MXL;

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 141 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
It's the sloping top tube that gives the illusion that there is too much seat post.
longbeachgary is offline  
Old 06-21-13, 10:12 AM
  #3  
chasm54
Banned.
 
Join Date: May 2010
Location: Uncertain
Posts: 8,651
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
There's a mark on the post that shows how much of it can be safely exposed.
chasm54 is offline  
Old 06-21-13, 10:22 AM
  #4  
Ronno6
Senior Member
 
Ronno6's Avatar
 
Join Date: Nov 2010
Location: Deep South
Posts: 1,262

Bikes: Cannondale SR's and ST's from the '80's

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 284 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Jarrett2 View Post
I'm finding I have to really raise my seat up high to feel right on the bike. Is this post too high to be safe for a 350lber?

https://share.htc.com/5D-omADc5#slides/0
Your weight has no bearing on proper seat height, if that is what you are asking.
Raise the saddle til your leg has about 15-20 if bend when your foot is at the bottom of the stroke. YMMV
As to whether the seat is higher than the manufacturer's specified minimum, that, as previously indicated, should be marked on the post.
Ronno6 is offline  
Old 06-21-13, 10:33 AM
  #5  
Jarrett2
Senior Member
Thread Starter
 
Jarrett2's Avatar
 
Join Date: May 2013
Location: DFW
Posts: 4,129

Bikes: Steel 1x's

Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 630 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks for the info, I'll look for a mark. There is about 6 inches of post still in the frame at that height.
Jarrett2 is offline  
Old 06-21-13, 10:59 AM
  #6  
Mr. Beanz
Banned.
 
Mr. Beanz's Avatar
 
Join Date: Dec 2005
Location: Upland Ca
Posts: 19,896

Bikes: Lemond Chambery/Cannondale R-900/Trek 8000 MTB/Burley Duet tandem

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
More modern designs leave more post showing, especially mountain bike types. My MTB show lots of post.

Only way for us to know your seat is too high is to see a picture of you on it.




Mr. Beanz is offline  
Old 06-21-13, 11:27 AM
  #7  
Jarrett2
Senior Member
Thread Starter
 
Jarrett2's Avatar
 
Join Date: May 2013
Location: DFW
Posts: 4,129

Bikes: Steel 1x's

Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 630 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
lol, I don't mean too high for me personally, I mean too high to be structurally sound. Like at some point if I raise it too high, its going to break from my weight on it.
Jarrett2 is offline  
Old 06-21-13, 12:13 PM
  #8  
mrkm
Member
 
Join Date: Jun 2013
Location: Toronto, Canada
Posts: 44

Bikes: 2005 Norco Wolverine, 2013 Surly Disc Trucker

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Being new to biking, I was just made aware yesterday of the fact that the post needs to be in the frame quite a bit otherwise you risk bending it or snapping the frame.

Here's how mine is:

mrkm is offline  
Old 06-21-13, 12:34 PM
  #9  
Mr. Beanz
Banned.
 
Mr. Beanz's Avatar
 
Join Date: Dec 2005
Location: Upland Ca
Posts: 19,896

Bikes: Lemond Chambery/Cannondale R-900/Trek 8000 MTB/Burley Duet tandem

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Jarrett2 View Post
lol, I don't mean too high for me personally, I mean too high to be structurally sound. Like at some point if I raise it too high, its going to break from my weight on it.
As others have stated, there is a minimum insertion line on the post.

Plus, the frame needs to have at least 2 inches of post in it (should be just passed the top tube) to be safe for the frame. Well, that is the way it was a few years back unless things have changed.
Mr. Beanz is offline  
Old 06-21-13, 12:42 PM
  #10  
Jarrett2
Senior Member
Thread Starter
 
Jarrett2's Avatar
 
Join Date: May 2013
Location: DFW
Posts: 4,129

Bikes: Steel 1x's

Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 630 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Cool, thanks for all the info!
Jarrett2 is offline  
Old 06-21-13, 03:01 PM
  #11  
CraigB
Starting over
 
CraigB's Avatar
 
Join Date: Jun 2005
Location: Indianapolis
Posts: 4,077

Bikes: 1990 Trek 1500; 2006 Gary Fisher Marlin; 2011 Cannondale Synapse Alloy 105; 2012 Catrike Trail

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Mr. Beanz View Post
Plus, the frame needs to have at least 2 inches of post in it (should be just passed the top tube) to be safe for the frame. Well, that is the way it was a few years back unless things have changed.
The latest goofite and unobtanium alloys only require 3/16".

CraigB is offline  
Old 06-21-13, 03:37 PM
  #12  
Mr. Beanz
Banned.
 
Mr. Beanz's Avatar
 
Join Date: Dec 2005
Location: Upland Ca
Posts: 19,896

Bikes: Lemond Chambery/Cannondale R-900/Trek 8000 MTB/Burley Duet tandem

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by CraigB View Post
The latest goofite and unobtanium alloys only require 3/16".

Wow, technology!

Myself being a Clyde, I'll stick to the old rule.
Mr. Beanz is offline  
Old 06-22-13, 05:06 PM
  #13  
nfmisso
Nigel
 
nfmisso's Avatar
 
Join Date: Mar 2011
Location: San Jose, CA
Posts: 3,005

Bikes: 1980s and 1990s steel: CyclePro, Nishiki, Schwinn, SR, Trek........

Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 377 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The typically failure mode for the seat post is to bend right where it comes out of the frame, usually it will not break, but just bend. I did have one bend, and then I ran a stress calculation (I am a Mechanical Design Engineer), and found that the seat post bent at very close the expected load. The bending stress that a seat post sees is proportional to the distance from where the seat post enters the frame to the top of your saddle. The stress proportional to one over the diameter of the seat post raised to the fourth power. Thus a 27.2mm seat post is more than 25% stronger than a 25.4mm seat post of the same material. The inner diameter has very little effect on the strength of a seat post. That all said, for us 350lbers; I would suggest 8 inches or less from seat post exit to top saddle with a 25.4mm seat post, 10 inches or less with a 27.2mm seat post.
nfmisso is offline  
Old 06-22-13, 05:07 PM
  #14  
nfmisso
Nigel
 
nfmisso's Avatar
 
Join Date: Mar 2011
Location: San Jose, CA
Posts: 3,005

Bikes: 1980s and 1990s steel: CyclePro, Nishiki, Schwinn, SR, Trek........

Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 377 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Your frame looks a might small for you.
nfmisso is offline  
Old 06-22-13, 07:49 PM
  #15  
Jarrett2
Senior Member
Thread Starter
 
Jarrett2's Avatar
 
Join Date: May 2013
Location: DFW
Posts: 4,129

Bikes: Steel 1x's

Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 630 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by nfmisso View Post
Your frame looks a might small for you.
I agree with you. I'm 6'1". The bike in the picture is the first bike I purchased. The first store initially had me on a size small Specialized Expedition Sport frame. I told them I thought it was too small, so they bumped me up to a medium. I still felt it was too small, but didn't want to argue with the pros.

Today, I went back to another bike store and got sized for a new bike. They put me on a 22.5" Trek FX frame. Way bigger bike and it felt better to me. Not all scrunched up like on my first bike. I ended up buying it and taking it for a ride today and enjoyed the size of it much more. Planning a 20 mile ride on the new bike tomorrow morning.
Jarrett2 is offline  
Old 06-23-13, 10:39 AM
  #16  
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 10,675

Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 620 Post(s)
Liked 8 Times in 7 Posts
I use a smaller frame so I can ride more upright due to back issues.
The stock seat post ended up about 1/8" "legal" regarding the insertion mark.
I wasn't comfortable with that and ordered a 400mm seat post for $20 @ the LBS.
The extra 2" (50mm) gives me a much better sense that I'm not going to damage the seat tube.
Bill Kapaun is offline  
Old 06-23-13, 11:25 AM
  #17  
Jarrett2
Senior Member
Thread Starter
 
Jarrett2's Avatar
 
Join Date: May 2013
Location: DFW
Posts: 4,129

Bikes: Steel 1x's

Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 630 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Did the 20 mile on the new bike today. Definitely not as comfortable as my comfort bike, but easier to go faster on the road for sure. I'm looking forward to getting accustomed to this type of ride.
Jarrett2 is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.