Seatpost sizing for old Schwinns - '78 Le Tour, '80 Traveler
#1
Senior Member
Thread Starter
Join Date: Oct 2005
Location: Fresno, CA
Posts: 4,454
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 128 Post(s)
Likes: 0
Liked 12 Times
in
10 Posts
Seatpost sizing for old Schwinns - '78 Le Tour, '80 Traveler
Just for the record, once these forums become searchable again...
Lots of old Schwinn road bikes came, production, with a seatpost shim and thus a narrower seatpost than would fit into the frame's seat tube if no shim were used.
There is some thought that shimmed seatpost was so that Schwinn didn't have to clean out any burs on the inside of the seat tube, although it doesn't seem as if that would be very difficult.
Anyway, I have recently worked on three older Schwinn models, using fine sandpaper to smooth the metal on the inside of the seat tube. Here's what they take:
Lots of old Schwinn road bikes came, production, with a seatpost shim and thus a narrower seatpost than would fit into the frame's seat tube if no shim were used.
There is some thought that shimmed seatpost was so that Schwinn didn't have to clean out any burs on the inside of the seat tube, although it doesn't seem as if that would be very difficult.
Anyway, I have recently worked on three older Schwinn models, using fine sandpaper to smooth the metal on the inside of the seat tube. Here's what they take:
- 1978 Schwinn Le Tour III - 26.0mm seatpost fits perfectly, slides in with no resistance but also has no play once inside the seat tube
- 1980 Schwinn Traveler - same as the 1978 Le Tour. Before sanding the inside of the seat tube, a 26.0 post would go partway in and then get caught on whatever burs on the inside of the tube.
- 1983 Schwinn Le Tour Luxe - 26.4mm seatpost fits cleanly after sanding off the inside of the seattube. <well biked> reports the same for his 1983 Le Tour Luxe.
__________________
"c" is not a unit that measures tire width
"c" is not a unit that measures tire width
#2
Senior Member
Join Date: Jul 2005
Posts: 7,487
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 140 Post(s)
Liked 162 Times
in
89 Posts
Maybe it varied some from year to year, model to model, but FWIW, my '82 Super le tour with 1020 tubing (very similar frame to the '78 le tour III and '80 Traveler you mention, I would think) had a 25.8 SR Laprade seatpost, with no shim, and it seemed to fit perfectly.
And yep, the '83 le tour luxe uses a 26.4 post, although I think we've determined it came with a shimmed post of a smaller size originally, as you say. I couldn't find the original seatpost or shim from my '83 when I rebuilt it, though, so I took the 26.4 SR Laprade from an '84 le tour I also have. I really like those old Laprade posts anyway. Both the '83 and '84 le tours are 4130 frames.
And yep, the '83 le tour luxe uses a 26.4 post, although I think we've determined it came with a shimmed post of a smaller size originally, as you say. I couldn't find the original seatpost or shim from my '83 when I rebuilt it, though, so I took the 26.4 SR Laprade from an '84 le tour I also have. I really like those old Laprade posts anyway. Both the '83 and '84 le tours are 4130 frames.
Last edited by well biked; 08-30-06 at 02:41 PM.
#3
Freewheel Medic
Join Date: Oct 2005
Location: An Island on the Coast of GA!
Posts: 12,882
Bikes: Snazzy* Schwinns, Classy Cannondales & a Super Pro Aero Lotus (* Ed.)
Mentioned: 140 Post(s)
Tagged: 0 Thread(s)
Quoted: 1452 Post(s)
Liked 2,195 Times
in
962 Posts
I've had seatpost challenges of my own on my '79 Traveler. When I wanted to replace the original steel and chrome straight top post, it took a long search before I found a 25.8 alloy one. I ended up bidding on a NOS from an ebayer in Australia. It took over a month to arrive but only cost around $25 with the shipping. With the shim it has been tough to tighten the clamp enough to keep it at the correct height. I gave up using the Sugino recessed allen nut and bolt. I now use a modified MTB quick release lever from a "dump find." It doesn't look the best, but makes for easy on the road adjustments and lets me remove the Brooks in a hurry if a storm pops up. Tim, I wish I had known about your experience of moving up to a 26mm.
__________________
Bob
Enjoying the GA coast all year long!
Thanks for visiting my website: www.freewheelspa.com
Bob
Enjoying the GA coast all year long!
Thanks for visiting my website: www.freewheelspa.com