Go Back  Bike Forums > Bike Forums > Classic & Vintage
Reload this Page >

What are these threaded holes in the seatpost for? (with pictures)

Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

What are these threaded holes in the seatpost for? (with pictures)

Old 05-29-14, 04:33 PM
  #1  
Squeeze
High Plains Luddite
Thread Starter
 
Join Date: Jul 2013
Location: Colorado
Posts: 577

Bikes: '90s MTBs, '96 Allez

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 144 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
What are these threaded holes in the seatpost for? (with pictures)

This must be for some kind of under-seat bag, but I've never seen holes like these before. Does anyone know what kind of bag they're for? This is a 1996 steel frame Specialized Allez Sport, if that matters. I don't know if the seatpost is original or not.

I would mind having the option of carrying a larger under-seat bag at times if that's what this is for. I'm thinking of the larger bags I see strapped to Brooks saddles sometimes, but pictures of those I've seen at this forum don't appear to mount in this manner.

Thanks for any information, advice and/or wild guesses.





Squeeze is offline  
Old 05-29-14, 04:43 PM
  #2  
thinktubes 
Fast+Bulbous
 
thinktubes's Avatar
 
Join Date: Dec 2008
Location: Across the street from Chicago
Posts: 4,479

Bikes: Battaglin Cromor, Ciocc Designer 84, Schwinn Superior 1981

Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 322 Post(s)
Liked 22 Times in 11 Posts
Tri-geek water bottles.
thinktubes is offline  
Old 05-29-14, 04:51 PM
  #3  
rootboy 
Senior Member
 
rootboy's Avatar
 
Join Date: Apr 2005
Location: Wherever
Posts: 16,621
Mentioned: 75 Post(s)
Tagged: 0 Thread(s)
Quoted: 493 Post(s)
Likes: 0
Liked 3 Times in 3 Posts
Retro rocket mount.
rootboy is offline  
Old 05-29-14, 04:54 PM
  #4  
Chombi 
Senior Member
 
Chombi's Avatar
 
Join Date: Jul 2009
Posts: 11,139

Bikes: 1986 Alan Record Carbonio, 1985 Vitus Plus Carbone 7, 1984 Peugeot PSV, 1972 Line Seeker, 1986(est.) Medici Aerodynamic (Project), 1985(est.) Peugeot PY10FC

Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 139 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Yes, could very well be "triathlon style" behind the seat bottle mounts, I think, Although they had been used by lots of non-triathletes too.
Not sure what the advantage and disadvantage of using such. I see a plus towards aerodynamics, but then you also gain a bit more weight on the bike and the heavy bottles are higher up the frame which might, in some, I suspect very rare instances, affect handling/stability Could be a negative in the pro level when climbing, as you will be swinging the weight two water filled bottles and the additional bracketry from side to side, high up on the bike, when you stand on the pedals. Maybe triathletes just don't climb that much??
Chombi is offline  
Old 05-29-14, 07:17 PM
  #5  
thinktubes 
Fast+Bulbous
 
thinktubes's Avatar
 
Join Date: Dec 2008
Location: Across the street from Chicago
Posts: 4,479

Bikes: Battaglin Cromor, Ciocc Designer 84, Schwinn Superior 1981

Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 322 Post(s)
Liked 22 Times in 11 Posts
thinktubes is offline  
Old 05-29-14, 10:10 PM
  #6  
uncle uncle
Senior Member
 
Join Date: Aug 2010
Location: south kansas america
Posts: 1,488

Bikes: too many

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 245 Post(s)
Liked 2 Times in 2 Posts
Those are perfect for hanging those license plates you got free in boxes of Hyper Sugar Bombs breakfast cereal back in the day. https://www.flickr.com/photos/bolio88/6154185223/
uncle uncle is offline  
Old 05-30-14, 09:56 AM
  #7  
Squeeze
High Plains Luddite
Thread Starter
 
Join Date: Jul 2013
Location: Colorado
Posts: 577

Bikes: '90s MTBs, '96 Allez

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 144 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
^ I remember those license plates! I might have had one on my banana bike in the '70s.

Water bottle holder, huh? Okay. Darn. I was hoping for some kind of a cool bag mount thingy.

Thanks for the advice, all.
Squeeze is offline  
Old 05-30-14, 10:03 AM
  #8  
brockd15 
Senior Member
 
brockd15's Avatar
 
Join Date: Dec 2008
Location: Cupertino, CA
Posts: 1,608
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 41 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
It looks like it would be for mounting a bracket for water bottle cages, but I've never actually seen a seatpost like that. The behind-the-seat bottle cage mounts that I've seen (and used when I did triathlons) didn't have a particular seatpost to use with them. They generally mounted to the saddle rails or clamped around the seatpost. It could be for a certain saddle bag.
brockd15 is offline  
Old 05-30-14, 10:38 AM
  #9  
arex
Abuse Magnet
 
arex's Avatar
 
Join Date: Jun 2012
Location: Colorado
Posts: 1,649

Bikes: '91 Mtn Tek Vertical, '74 Raleigh Sports, '72 Raleigh Twenty, '84 Univega Gran Turismo, '09 Surly Karate Monkey

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Liked 2 Times in 1 Post
Toeclips.
arex is offline  
Old 05-30-14, 11:39 AM
  #10  
pedalnmetal
Senior Member
 
Join Date: May 2013
Posts: 150
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I believe that's the ashtray mount.
pedalnmetal is offline  
Old 05-30-14, 12:48 PM
  #11  
jimmuller 
What??? Only 2 wheels?
 
jimmuller's Avatar
 
Join Date: Apr 2010
Location: Boston-ish, MA
Posts: 13,062

Bikes: 73 Raleigh Carlton Gran Sport, 72 Peugeot UO-8, 82 Peugeot TH8, 87 Bianchi Brava, 76? Masi Grand Criterium, 87 Centurion Ironman Expert, 74 Motobecane Champion Team, 86 & 77 Gazelle champion mondial, 81? Grandis, 82? Tommasini, 83 Peugeot PFN10

Mentioned: 169 Post(s)
Tagged: 0 Thread(s)
Quoted: 1046 Post(s)
Liked 13 Times in 11 Posts
CD rack.
__________________
Real cyclists use toe clips.
With great bikes comes great responsibility.
jimmuller
jimmuller is offline  
Old 05-31-14, 12:33 AM
  #12  
gaucho777 
Senior Member
 
gaucho777's Avatar
 
Join Date: Aug 2009
Location: Berkeley, CA
Posts: 6,323

Bikes: '72 Cilo Pacer, '72 Peugeot PX10, '73 Speedwell Ti, '74 Nishiki Competition, '74 Peugeot UE-8, '85 De Rosa Pro, '86 Look Equipe 753, '86 Look KG86, '89 Parkpre Team, '90 Parkpre Team MTB, '90 Merlin

Mentioned: 57 Post(s)
Tagged: 0 Thread(s)
Quoted: 393 Post(s)
Likes: 0
Liked 4 Times in 4 Posts
Tri-bottle bottle mount would make more sense if the holes weren't in the wrong alignment. I think the correct answer is Anything You Want. My money would be on saddle bag, but you could mount any number of things--rear light, saddle bag, pump mount, lock mount, horn, bottle dynamo-powered phone charger, etc. Get creative!
gaucho777 is offline  
Old 05-31-14, 12:54 AM
  #13  
Gary Fountain
Senior Member
 
Gary Fountain's Avatar
 
Join Date: Sep 2005
Location: Hervey Bay, Qld, Australia.
Posts: 2,622

Bikes: Colnago (82, 85, 89, 90, 91, 96, 03), 85 Cinelli, 90 Rossin, 83 Alan, 82 Bianchi, 78 Fountain, 2 x Pinarello, Malvern Star (37), Hillman (70's), 80's Beretto Lo-Pro Track, 80's Kenevans Lo-Pro, Columbus Max (95), DeGrandi (80's) Track.

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 72 Post(s)
Liked 5 Times in 5 Posts
Seatbelt mounting points???
Gary Fountain is offline  
Old 05-31-14, 05:34 AM
  #14  
Prowler 
Senior Member
 
Join Date: Nov 2013
Location: Near Pottstown, PA: 30 NW of Philadelphia
Posts: 1,284

Bikes: 2 Trek Mtn, Cannondale R600 road, 6 vintage road bikes

Mentioned: 51 Post(s)
Tagged: 0 Thread(s)
Quoted: 151 Post(s)
Liked 11 Times in 6 Posts
FYI I have the exact same thing on my 1995 Trek ZX7000 mountain bike.   I think the post is a 27.2 but the clamp matches yours. I also have no idea what the mounts are for nor if it was stock on the bike.  Everything else on the bike was stock though.  I've often wondered what I could make to bolt to those mounts but I really don't need anything.  I use an EMS Clam seat bag for the phone and car keys and don't need anything else.
Prowler is offline  
Old 05-31-14, 06:10 AM
  #15  
bikemig 
Senior Member
 
bikemig's Avatar
 
Join Date: Apr 2012
Location: Middle Earth (aka IA)
Posts: 15,136

Bikes: A bunch of old bikes and a few new ones

Mentioned: 107 Post(s)
Tagged: 0 Thread(s)
Quoted: 3613 Post(s)
Liked 67 Times in 59 Posts
You could always drill a few more holes in your seatpost and make your bike a little lighter,
bikemig is offline  
Old 05-31-14, 07:01 AM
  #16  
wrk101
Thrifty Bill
 
wrk101's Avatar
 
Join Date: Jan 2008
Location: Mountains of Western NC
Posts: 22,019

Bikes: 86 Katakura Silk, 87 Prologue X2, 88 Cimarron LE, 1975 Sekai 4000 Professional, 73 Paramount, plus more

Mentioned: 67 Post(s)
Tagged: 0 Thread(s)
Quoted: 653 Post(s)
Likes: 0
Liked 39 Times in 34 Posts
Seat bag. I've also seen bottle cage mount that would fit on it.

Last edited by wrk101; 05-31-14 at 09:15 AM.
wrk101 is offline  
Old 05-31-14, 07:35 AM
  #17  
cobrabyte
one life on two wheels
 
cobrabyte's Avatar
 
Join Date: Jul 2008
Location: St. Petersburg, FL
Posts: 2,556
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time in 1 Post
I would say the holes are there so you can bolt something to them. Just a guess though...
cobrabyte is offline  
Old 05-31-14, 07:48 AM
  #18  
brandon98
Senior Member
 
brandon98's Avatar
 
Join Date: Mar 2010
Location: Columbia County, Georgia
Posts: 285

Bikes: Schwinns: Paramount (Waterford), Peloton (1986 and 1999), 1987 Super Sport. Offbrand bikes: Bianchi Intenso, Diamondback Interval TG (Ironman), Peugeot Triathlon, Masi CX

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 34 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Obviously for a pintle mount for a rear facing beltfed or to hard mount M18A1 claymore to deal with texting Prius drivers attempting to kill you. Claymores on bungies just don't have that accurate dispersal you seek otherwise.
brandon98 is offline  
Old 05-31-14, 08:14 AM
  #19  
photogravity
Hopelessly addicted...
 
photogravity's Avatar
 
Join Date: Aug 2009
Location: Central Maryland
Posts: 5,008

Bikes: 1949 Hercules Kestrel, 1950 Norman Rapide, 1970 Schwinn Collegiate, 1972 Peugeot UE-8, 1976 Raleigh Sports, 1977 Raleigh Sports, 1977 Jack Taylor Tandem, 1984 Davidson Tandem, 2010 Bilenky "BQ" 650B Constructeur Tandem, 2011 Linus Mixte

Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by thinktubes View Post
Tri-dork water bottles.
ftfy
photogravity is offline  
Old 05-31-14, 10:25 AM
  #20  
Bledfor Days 
Senior Member
 
Bledfor Days's Avatar
 
Join Date: Jan 2014
Location: Port Moody BC Canada
Posts: 124

Bikes: Vintage cheapies and some modern stuff.

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Giant rat trap front mount.
__________________
Coming to a Craigslist near you soon.
Twitter @BledforDays2
Bledfor Days is offline  
Old 05-31-14, 12:37 PM
  #21  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,928

Bikes: 8

Mentioned: 188 Post(s)
Tagged: 0 Thread(s)
Quoted: 6836 Post(s)
Likes: 0
Liked 215 Times in 179 Posts
Since they are there , take some initiative and make something to use them ..

add a bottle opener , Rear Bag , taillight any number of ways to make it a feature , not a Puzzle.
fietsbob is offline  
Old 05-31-14, 05:21 PM
  #22  
RobbieTunes 
Half drunk? Finish!
 
RobbieTunes's Avatar
 
Join Date: Dec 2007
Location: Very Southern Indiana
Posts: 25,745
Mentioned: 32 Post(s)
Tagged: 1 Thread(s)
Quoted: 346 Post(s)
Liked 58 Times in 48 Posts
Originally Posted by brandon98 View Post
Obviously for a pintle mount for a rear facing beltfed or to hard mount M18A1 claymore to deal with texting Prius drivers attempting to kill you. Claymores on bungies just don't have that accurate dispersal you seek otherwise.
+1

Not only an excellent mount for the claymore, it will provide a slight boost to the rider upon denotation. Definitely would keep people off your wheel.

Walmart still has those license plates. I was thinking about getting one for my next century.

I actually had a seatpost just like that, and for the life of me cannot remember what brand it was. It was not generic, and it was a decent brand, if I recall correctly. The mounting plate interfered slightly with mounting an SLR saddle. wrk101 is correct, a seatbag mount went there, and allowed you to move the bag from bike to bike. I have a Zefal bag/mount that bolts right to it.

My increasing rider paranoia would turn it into a perfect rear light mount, if you can just get the light to extend beyond the saddle, instead of up inside it. Also, a good place to mount that Garmin you really don't need while you're riding.

Or, you could mount a sign on it. I'm sure the sign makes this more visible...
__________________
Robbie ♪♫♪...☻
I have unfinished business.


Last edited by RobbieTunes; 05-31-14 at 05:31 PM.
RobbieTunes is offline  
Old 05-31-14, 08:34 PM
  #23  
Vintage_Cyclist
Senior Member
 
Vintage_Cyclist's Avatar
 
Join Date: Nov 2013
Location: Big Apple
Posts: 1,236

Bikes: yes

Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 316 Post(s)
Likes: 0
Liked 1 Time in 1 Post
That's the mount for the James Bond Ejection Seat mechanism. They're like airbags in a car and need to be replaced after being triggered. You should be able to get a replacement one on Ebay.
Vintage_Cyclist is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Chris0516
Advocacy & Safety
11
09-25-17 10:27 AM
abright
Bicycle Mechanics
14
09-13-16 09:01 AM
cs_parsons
Commuting
33
02-26-15 05:05 PM
randya
Advocacy & Safety
84
04-08-09 06:27 AM
valygrl
Mountain - Plains
2
08-22-07 08:44 PM

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.