Double bolt seatpost clamps
#1
Proud hobo biker
Thread Starter
Join Date: Nov 2014
Location: Schertz - New Braunfels area
Posts: 804
Bikes: 2019 Surly Ogre, 2016 Giant Anyroad 2, Lightspeed Roadrunner trike, SE Tripel (in process)
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 202 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Double bolt seatpost clamps
I am rebuilding a cheap tandem (don't judge - it cost me $20 and I've put another $30 in it).
Everything else has been cleaned up, repaired, or replaced with affordable parts or stuff I had laying around. It's riding really well, at least as well as a cheap tandem can.
The seatpost clamps are double bolt. They were extremely tarnished and I have been unable to get them looking good. I'm having a hard time finding replacement clamps that won't cost an arm and a leg to ship, and that aren't ugly as hell colors (no silver or chrome, just oddball colors).
Any reason I can't replace the clamps with single bolt or even quick release clamps?
Everything else has been cleaned up, repaired, or replaced with affordable parts or stuff I had laying around. It's riding really well, at least as well as a cheap tandem can.
The seatpost clamps are double bolt. They were extremely tarnished and I have been unable to get them looking good. I'm having a hard time finding replacement clamps that won't cost an arm and a leg to ship, and that aren't ugly as hell colors (no silver or chrome, just oddball colors).
Any reason I can't replace the clamps with single bolt or even quick release clamps?
#2
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,095 Times
in
741 Posts
I'm not sure what you are describing, the saddle rail clamp on the seatpost or the clamp on the frame that holds the seatpost height? Pictures would help.
#3
Senior Member
Join Date: Oct 2013
Location: D'uh... I am a Cutter
Posts: 6,159
Bikes: '17 Access Old Turnpike Gravel bike, '14 Trek 1.1, '13 Cannondale CAAD 10, '98 CAD 2, R300
Mentioned: 62 Post(s)
Tagged: 0 Thread(s)
Quoted: 1571 Post(s)
Likes: 0
Liked 12 Times
in
9 Posts
Once while cleaning up and polishing the parts on an old bike I discovered one small chrome part had apparently corroded. So much so a previous owner had spray painted the part silver. It was almost unnoticeable.
#4
Proud hobo biker
Thread Starter
Join Date: Nov 2014
Location: Schertz - New Braunfels area
Posts: 804
Bikes: 2019 Surly Ogre, 2016 Giant Anyroad 2, Lightspeed Roadrunner trike, SE Tripel (in process)
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 202 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
The seatpost clamp, not the saddle rail clamp. (Random pic off the web; I'm at work and can't get a picture of my clamps.)
#6
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,095 Times
in
741 Posts
A newer single bolt seatpost clamp should work fine. Measure the OD of your seat tube where the clamp goes over it and buy the correct diameter clamp.
#8
Banned
The stainless steel Ones out of Surly should work . single bolt threaded into steel
I have used a second band clamp , directly around the seat Post . sitting on top of the frame clamp that grips the seat Post.
If 1 doesn't stop slipping , that fixed it ... (folding bike 2 QR levers on top of each Other .
I have used a second band clamp , directly around the seat Post . sitting on top of the frame clamp that grips the seat Post.
If 1 doesn't stop slipping , that fixed it ... (folding bike 2 QR levers on top of each Other .
#9
Senior Member
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 30,225
Bikes: Catrike 559 I own some others but they don't get ridden very much.
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1572 Post(s)
Liked 642 Times
in
363 Posts
__________________
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
#10
Senior Member
Join Date: Mar 2010
Location: City of Brotherly Love
Posts: 1,562
Bikes: Raleigh Companion, Nashbar Touring, Novara DiVano, Trek FX 7.1, Giant Upland
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
In rare instances where there is no slot in the seat tube, a double bolt clamp is needed. In most cases a normal clamp will work.
#13
Senior Member
Join Date: Aug 2013
Posts: 766
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
FWIW, the clamp you pictured is marked GT and appears to fit a 1" tube. It's what they would have fitted to their old school BMX bikes. So it's not an original part anyway.
#14
Proud hobo biker
Thread Starter
Join Date: Nov 2014
Location: Schertz - New Braunfels area
Posts: 804
Bikes: 2019 Surly Ogre, 2016 Giant Anyroad 2, Lightspeed Roadrunner trike, SE Tripel (in process)
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 202 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
#16
Proud hobo biker
Thread Starter
Join Date: Nov 2014
Location: Schertz - New Braunfels area
Posts: 804
Bikes: 2019 Surly Ogre, 2016 Giant Anyroad 2, Lightspeed Roadrunner trike, SE Tripel (in process)
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 202 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
I just grabbed the first "used" pic I could find, rather than a sparkling new clamp, trying to avoid confusion (and created some instead).
Thanks to everyone who helped on this thread. Hillrider reminded me to size the clamp correctly, which means I need a 28.6 clamp (just guessing; will verify at home) rather than a smaller diameter. Amazon has several double bolt clamps in that size, if I can't use a single bolt clamp. Pricier than I'd like but I'm sure I can find some for under $10 now if need be.
Thanks to everyone who helped on this thread. Hillrider reminded me to size the clamp correctly, which means I need a 28.6 clamp (just guessing; will verify at home) rather than a smaller diameter. Amazon has several double bolt clamps in that size, if I can't use a single bolt clamp. Pricier than I'd like but I'm sure I can find some for under $10 now if need be.