How far up can I put a seatpost?
04-04-10, 02:20 PM
#1
It'll be fine...
Thread Starter
Join Date: Mar 2006
Location: Glasgow
Posts: 92
Bikes: Scott CR1, Fuji Aloho 2, Giant Terrago Disc
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
How far up can I put a seatpost?
Hey folks.
So I'm trying to get my saddle up high enough - but just found that to get it high enough, it's getting quite close to the top of the seat tube. (see image below).
Is this dangerously high? I'm wondering it the lever effect of my 13 stone bunch of bones on such a small securing point might be cause for concern.
Any advice, greatly appreciated.
John
So I'm trying to get my saddle up high enough - but just found that to get it high enough, it's getting quite close to the top of the seat tube. (see image below).
Is this dangerously high? I'm wondering it the lever effect of my 13 stone bunch of bones on such a small securing point might be cause for concern.
Any advice, greatly appreciated.
John
__________________
Recess (aka John)
www.recess.co.uk
"I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day."
Frank Sinatra
Recess (aka John)
www.recess.co.uk
"I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day."
Frank Sinatra
04-04-10, 02:22 PM
#2
Member
Join Date: Jan 2010
Location: Amsterdam, Netherlands
Posts: 31
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
the bottom of the seat post should be below the bottom edge of the top tube, otherwise you risk damage to the frame.
04-04-10, 02:30 PM
#3
It'll be fine...
Thread Starter
Join Date: Mar 2006
Location: Glasgow
Posts: 92
Bikes: Scott CR1, Fuji Aloho 2, Giant Terrago Disc
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
I hate to sound thick - but where's the 'bottom edge' of the top tube? Do you mean below where the weld point is?
My frame description knowledge isn't the best. I need to take a language course in how to describe parts of my bike....
My frame description knowledge isn't the best. I need to take a language course in how to describe parts of my bike....
__________________
Recess (aka John)
www.recess.co.uk
"I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day."
Frank Sinatra
Recess (aka John)
www.recess.co.uk
"I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day."
Frank Sinatra
04-04-10, 02:42 PM
#5
It'll be fine...
Thread Starter
Join Date: Mar 2006
Location: Glasgow
Posts: 92
Bikes: Scott CR1, Fuji Aloho 2, Giant Terrago Disc
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Ah. So I'm really rather risky right now then. Time to buy a new, longer seatpost...
__________________
Recess (aka John)
www.recess.co.uk
"I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day."
Frank Sinatra
Recess (aka John)
www.recess.co.uk
"I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day."
Frank Sinatra
04-04-10, 03:13 PM
#6
Perineal Pressurized
Join Date: Oct 2003
Location: In Ebritated
Posts: 6,555
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Most seatpost have a minimum insert distance marked on them. Your photo is an accident waiting to happen. Buy a longer post.
__________________
This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
04-04-10, 03:37 PM
#7
just pokin' along
Join Date: Aug 2008
Location: the desert
Posts: 1,095
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Have you fully removed the seatpost to determine exactly how long it is? Could there be an opening on the seatpost itself? I ask because I see what looks like more seatpost below this point. Also, I see measurement markings on the seatpost, but is there a maximum extension (or minimum insertion) mark on it?
04-04-10, 05:54 PM
#9
Senior Member
Join Date: Sep 2008
Location: Beautiful Long Beach California
Posts: 3,589
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: 143 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Have you fully removed the seatpost to determine exactly how long it is? Could there be an opening on the seatpost itself? I ask because I see what looks like more seatpost below this point. Also, I see measurement markings on the seatpost, but is there a maximum extension (or minimum insertion) mark on it?
04-04-10, 06:51 PM
#10
rebmeM roineS
Join Date: Jan 2006
Location: Metro Indy, IN
Posts: 16,216
Bikes: Bacchetta Giro A20, RANS V-Rex, RANS Screamer
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 653 Post(s)
Liked 348 Times
in
227 Posts
That is extended way too high! As mentioned, should be a MAX Extension or MIN Insertion markings on the post. If none, check other similar seatposts to get a rough idea.
Yes, indeed, time for a new post.
Yes, indeed, time for a new post.
__________________
Bacchetta Giro A20, RANS V-Rex, RANS Screamer
Bacchetta Giro A20, RANS V-Rex, RANS Screamer
04-04-10, 07:13 PM
#11
Senior Member
Join Date: Jul 2008
Location: 25 miles northwest of Boston
Posts: 29,592
Bikes: Bottecchia Sprint, GT Timberline 29r, Marin Muirwoods 29er, Trek FX Alpha 7.0
Mentioned: 112 Post(s)
Tagged: 0 Thread(s)
Quoted: 5234 Post(s)
Liked 3,609 Times
in
2,357 Posts
yep, get a new seatpost
04-04-10, 07:51 PM
#12
Old fart
Join Date: Nov 2004
Location: Appleton WI
Posts: 24,844
Bikes: Several, mostly not name brands.
Mentioned: 154 Post(s)
Tagged: 0 Thread(s)
Quoted: 3617 Post(s)
Liked 3,454 Times
in
1,960 Posts
Since the mid-1970s in the USA, the Consumer Product Safety Commission (aka "CPSA") has required that seatposts be marked with a "Minimum Insertion" line below which it is not consider safe to use. In the UK you may not have such a requirement, but the pre-CPSA rule of thumb we used was that the post should extend below the seat clamp a distance at least twice the diameter of the post.
04-04-10, 08:26 PM
#14
Senior Member
Join Date: May 2008
Location: Zang's Spur, CO
Posts: 9,089
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 3424 Post(s)
Liked 5,631 Times
in
2,921 Posts
Paging Captain Picard!
04-04-10, 08:44 PM
#15
Senior Member
Join Date: Apr 2006
Location: Vero Beach FL
Posts: 1,102
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Just measured two of the seatposts I have loose around the house. Minimum insertion is approximately 75mm
04-05-10, 01:44 PM
#16
Let your bike be the tool
Join Date: Jun 2006
Location: NC/SC border
Posts: 945
Bikes: '66 Raleigh Carlton, '70 Ron Cooper, '95 Bianchi CD'I, Zonal Frame with Xenon gruppo, Carbon Frame with Record Gruppo, Columbia Twosome, Terry Classic, Bianchi SX, Gravity SS/FG
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 342 Post(s)
Liked 317 Times
in
197 Posts
I suspect someone has sawed off part of that seatpost.
__________________
Never try to teach a pig to sing...
Never try to teach a pig to sing...
04-05-10, 07:08 PM
#17
Senior Member
I just measured an old 27.2 and the mark is at 3&1/8". What you have is an accident waiting to happen. You can easily damage the seat tube of the frame with the leverage that is putting on it.
04-05-10, 09:00 PM
#18
Call me The Breeze
You're gonna need more tape.
04-06-10, 12:26 AM
#19
It'll be fine...
Thread Starter
Join Date: Mar 2006
Location: Glasgow
Posts: 92
Bikes: Scott CR1, Fuji Aloho 2, Giant Terrago Disc
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Hey folks. Just to let you know I took a seatpost off another Giant MTB, which was about 15-20cm longer, and am using that instead as it fits well inside. the 30.8mm diameter of the seatpost is a pain though, as I can't find any new ones locally (hence ripping it out of the other bike). Cranky Old Road may be right - looking at it, the bottom of the one that WAS in looks different to the bottom of the standard one I replaced it with.
Anyway - thanks again for all your help in keeping me safe.
John.
Anyway - thanks again for all your help in keeping me safe.
John.
__________________
Recess (aka John)
www.recess.co.uk
"I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day."
Frank Sinatra
Recess (aka John)
www.recess.co.uk
"I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day."
Frank Sinatra
04-06-10, 09:11 AM
#20
Old fart
Join Date: Nov 2004
Location: Appleton WI
Posts: 24,844
Bikes: Several, mostly not name brands.
Mentioned: 154 Post(s)
Tagged: 0 Thread(s)
Quoted: 3617 Post(s)
Liked 3,454 Times
in
1,960 Posts
