Classic & Vintage - Schwinn Super Sport seat post size?

Good morning, bikers. I just bought a 1971 Schwinn Super Sport for my son, and this will be his first road bike (what a clever way to feed my vintage habit). I’m planning to put the original steel Schwinn parts into storage, and replace them with alloy parts. The seat post appears to be steel, so I want to get an alloy post. Would anyone know what the diameter would be? (the bike hasn't arrived yet) Also, does anyone have any experience with the BMX US-to-European bottom bracket converters? Thanks.

Schwinn part number 58 806. Seat Post 9" long, 1 1/16" O.D. chrome.

1/16" = 1.587 mm

25.4 mm + 1.587 mm = 26.987 mm

So, you could try 27.0 mm, and if that's too big, go with 26.9 mm.

Nothing's simple. ;)

As far as the one-piece Ashtabula crank conversion is concerned, Pastor Bob did that conversion with his Super Sport, "Sporty" (http://www.bikeforums.net/showthread.php?t=452240)...

He's probably preaching his sermon about now, but will likely chime in when he sees this.

I own a fillet brazed Schwinn Superior, which is the same as the SS except the it has a threaded bb, forged dropouts with integral derailleur hanger.

The correct seat post for this bike 26.8mm I know because I bought a vintage Campy seat post in that size and it fits properly. Admittedly, this is no longer an easy size to find. My advice is to try eBay, that's where I bought my Campy seat post -- NOS from a seller in Italy.

I own a fillet brazed Schwinn Superior, which is the same as the SS except the it has a threaded bb, forged dropouts with integral derailleur hanger.

The correct seat post for this bike 26.8mm I know because I bought a vintage Campy seat post in that size and it fits properly. Admittedly, this is no longer an easy size to find. My advice is to try eBay, that's where I bought my Campy seat post -- NOS from a seller in Italy.
I agree; if 26.8 mm isn't easy to find, 26.9 mm is damn near impossible to find. Googling 26.8 seatpost, I got enough hits so you should be able to find one fairly easily.

As far as the one-piece Ashtabula crank conversion is concerned, Pastor Bob did that conversion with his Super Sport, "Sporty" (http://www.bikeforums.net/showthread.php?t=452240)...

He's probably preaching his sermon about now, but will likely chime in when he sees this.

Sermon is done. And I have a break before heading to my youth program later. 26.8 is the correct size. Sporty wears a SR Custom Campy copy supporting a Brooks Professional. :)
http://i125.photobucket.com/albums/p71/pastorbobnlnh/Brooks%20Saddles/BrooksHoney.jpg

The crank conversion begins with an adapter made by FMF or Truvativ, which is bolted into the over sized BB shell. Then it is hit and miss finding the correct length cartridge BB (I've never found a traditional BB which works in the adapter) to fit your crankset to the Super Sport frame. BB width is very dependent on the crankset, the the way the stays spread from the BB shell, and whether you plan to use a double or triple. Sporty has a 119mm Phil BB and runs a triple.

+1 on 26.8mm. That's what my '71 Super Sport takes.

Neal

Thanks for the info, guys, I'll start the search for a 26.8. I just bought a BMX BB adapter from Asylum, and once I actually get the bike I'll start looking around for other parts. The bike will be for general use, so I'll probably get a double crank. I imagine I'll need to switch pedals also. Actually, I plan to switch out the entire drivetrain, to 70's era Suntour and SR. By the way, how much does an all-alloy Super Sport weigh? How do the frames themselves compare with lugeed chrome-moly frames? I got the bike because I think the fillet-brazed chrome-moly frames are pretty cool, but they deserve some lighter parts.

Thanks for the info, guys, I'll start the search for a 26.8. I just bought a BMX BB adapter from Asylum, and once I actually get the bike I'll start looking around for other parts. The bike will be for general use, so I'll probably get a double crank. I imagine I'll need to switch pedals also. Actually, I plan to switch out the entire drivetrain, to 70's era Suntour and SR. By the way, how much does an all-alloy Super Sport weigh? How do the frames themselves compare with lugeed chrome-moly frames? I got the bike because I think the fillet-brazed chrome-moly frames are pretty cool, but they deserve some lighter parts.
The Sports Tourer and Super Sport fillet brazed frames are made with straight gauge (not butted) chromoly tubing, so they'll weigh a few ounces more than a lugged chromoly frame with double-butted tubing. The benefits of the straight gauge tubing (very dent resistant, super strong to carry all but the heaviest riders with ease) outweigh the slight weight penalty IMHO.

Pastor Bob thinks Sporty weighs 27-28 pounds (http://www.bikeforums.net/showpost.php?p=7240749&postcount=8) with the alloy components including the triple chainring. Pastor Bob also removed the kickstand, which is surprisingly heavy.

You're right; they're pretty cool.

My Super Sports w/ 27" alloy wheels, set up as a 5-speed, Truvativ adapter and 3-piece crankset, no kickstand, aluminum alloy seatpost, stem, and bars, and steel fenders weighs about 28 lbs.

Neal

My newly acquired '73 SS, frame and fork only, weighs about 10 lbs.

I stripped it down and used a weight watchers food scale:

Kickstand 13 3/8 lbs. (380g)
Handlebars 12 1/4 lbs. (347g)
Stem & small bolt 7 3/4 lbs. (220g)
Cammed stem bolt 3 lbs. (85g)
Two brakes 7 5/8 lbs. (216g)
Seat post 5 5/8 lbs. (160g)
Seat post clamp 2 5/8 lbs. (74g)
Original crank (heavier than heck!)

If your trying to lighten up a supersport you may as well start with a new bicycle..LOL

243075

25 lbs (excluding the tool bag), with the leather seat. Descends like it's on a luge run.

I like the fact that the frame is almost impossible to flex when climbing, grinding, etc. I've thought of making a cross bike out of one of these due to the geometry and great ride.

With the aluminum fork, the frame fork/headset was a bit under 9 lbs. The rest of the setup is an additional 16 lbs. With really light weight components, I could see getting the bike down to 23 lbs, but that might not mesh too well with the old school looks...

26.8 Is what my current projects takes.
As soon as the graphics arrive from JR will I have something to show you folks!

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