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

Converting a 1968 Schwinn Super Sport to Three Piece Crank

Notices
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.

Converting a 1968 Schwinn Super Sport to Three Piece Crank

Old 10-28-14, 06:38 PM
  #1  
joychri
joychri
Thread Starter
 
Join Date: Jun 2006
Location: Massachusetts
Posts: 149

Bikes: 1973 Raleigh Super Course, 1979 Raleigh Competition GS, 1987 Shogun 300, 1989 Trek 520, 1995 Gary Fisher Wahoo, 1968 Schwinn Super Sport, 1976 Raleigh Gran Sport, 1971 Raleigh Competition, Gunnar Crosshairs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Converting a 1968 Schwinn Super Sport to Three Piece Crank

Hi All,

I am planning on converting my 1968 Super Sport from a one piece to a three piece crankset using the TruVativ conversion kit. I am wondering for those that have done this if there are any types of bottom brackets or cranksets I should avoid. My understanding is that I am limited to English threading by the TruVativ conversion kit but before I purchase a new bottom bracket and crankset I would like to know if there are any that have caused people problems. My plan is to use a nicer crankset from the seventies or eighties (maybe a triple) in combination with a newer bottom bracket such as sold by velo-orange. I have posted a few pictures of the bike as it is currently set up below. Any thoughts or suggestions would be greatly appreciated.

Thanks.



Attached Images
File Type: jpg
image.jpg (82.0 KB, 168 views)
File Type: jpg
image.jpg (100.5 KB, 136 views)
joychri is offline  
Old 10-28-14, 07:09 PM
  #2  
Michael Angelo 
Senior Member
 
Michael Angelo's Avatar
 
Join Date: May 2010
Location: Hurricane Alley , Florida
Posts: 3,882

Bikes: Treks (USA), Schwinn Paramount, Schwinn letour,Raleigh Team Professional, Gazelle GoldLine Racing, 2 Super Mondias, Carlton Professional.

Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 63 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
It should be an easy conversion. Just match the crank to the bottom bracket.
Michael Angelo is offline  
Old 10-28-14, 07:39 PM
  #3  
Metacortex
Senior Member
 
Join Date: Apr 2011
Posts: 2,370

Bikes: Fillet-brazed Schwinns

Mentioned: 56 Post(s)
Tagged: 0 Thread(s)
Quoted: 205 Post(s)
Liked 10 Times in 7 Posts
Here's a good write-up on the process: Hugh`s bicycle blog: Bottom Bracket Conversion American-to-Euro
Metacortex is offline  
Old 10-29-14, 02:14 PM
  #4  
joychri
joychri
Thread Starter
 
Join Date: Jun 2006
Location: Massachusetts
Posts: 149

Bikes: 1973 Raleigh Super Course, 1979 Raleigh Competition GS, 1987 Shogun 300, 1989 Trek 520, 1995 Gary Fisher Wahoo, 1968 Schwinn Super Sport, 1976 Raleigh Gran Sport, 1971 Raleigh Competition, Gunnar Crosshairs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thank for the responses.
Metacortex that articles looks very helpful. Much appreciated.
joychri is offline  
Old 10-29-14, 02:20 PM
  #5  
icepick_trotsky 
Aspiring curmudgeon
 
icepick_trotsky's Avatar
 
Join Date: Aug 2014
Location: Saint Louis
Posts: 2,667

Bikes: Guerciotti, Serotta, Gaulzetti

Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 103 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
If you're getting a new bottom bracket anyway, just pick your crank then buy the corresponding BB. Here's a handy cheat sheet: Sheldon Brown's Bottom Bracket Size Database
__________________
"Party on comrades" -- Lenin, probably
icepick_trotsky is offline  
Old 10-30-14, 01:05 PM
  #6  
Mr IGH
afraid of whales
 
Mr IGH's Avatar
 
Join Date: Apr 2009
Location: Front Range, CO
Posts: 4,307
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 346 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by joychri View Post
Hi All,

I am planning on converting my 1968 Super Sport from a one piece to a three piece crankset using the TruVativ conversion kit. I am wondering for those that have done this if there are any types of bottom brackets or cranksets I should avoid....
There's a ridge inside most Schwinn bottom brackets:


I had to bevel the edge of the TruVativ adapter to get it to seat correctly, I used my bench grinder:


Beveled and correctly seated allows a 68mm English BB to work perfectly:
Attached Images
File Type: jpg
SS bottom bracket ridge.jpg (44.0 KB, 133 views)
File Type: jpg
SS bottom bracket converter.jpg (57.9 KB, 128 views)
File Type: jpg
SS bottom bracket converted.jpg (50.7 KB, 131 views)

Last edited by Mr IGH; 10-30-14 at 01:12 PM.
Mr IGH is offline  
Old 10-30-14, 01:16 PM
  #7  
Mr IGH
afraid of whales
 
Mr IGH's Avatar
 
Join Date: Apr 2009
Location: Front Range, CO
Posts: 4,307
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 346 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Metacortex View Post
The author spends a bunch of time making a press, I tapped the adapter cups in with wood and a 3lb hammer, worked well for me.
Mr IGH is offline  
Old 10-30-14, 02:25 PM
  #8  
Hudson308 
Mr. Anachronism
 
Hudson308's Avatar
 
Join Date: Jan 2013
Location: City of Lakes
Posts: 1,610

Bikes: fillet-brazed Chicago Schwinns, and some other stuff

Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
Quoted: 369 Post(s)
Liked 41 Times in 30 Posts
Sweet... another gorgeous FB project, and a 60's model to boot. Keep the pictures coming, please!
__________________
"If we don't change direction soon, we'll end up where we're going." -Irwin Corey
Hudson308 is offline  
Old 10-30-14, 02:37 PM
  #9  
Scooper
Decrepit Member
 
Scooper's Avatar
 
Join Date: Aug 2005
Location: Santa Rosa, California
Posts: 10,490

Bikes: Waterford 953 RS-22, several Paramounts

Mentioned: 65 Post(s)
Tagged: 0 Thread(s)
Quoted: 616 Post(s)
Likes: 0
Liked 3 Times in 3 Posts
My '73 Super Sport conversion using the TruVative adapter was completely painless. I used a Campy Centaur bottom bracket (111mm spindle, English threaded, Campagnolo p/n BB5-CE1G). The crankset is Campy Comp Triple.

__________________
- Stan

my bikes

Science doesn't care what you believe.

Last edited by Scooper; 10-30-14 at 03:01 PM. Reason: added BB p/n
Scooper is offline  
Old 10-30-14, 03:05 PM
  #10  
3alarmer
******
 
3alarmer's Avatar
 
Join Date: Nov 2010
Location: The Big Tomato
Posts: 17,557

Bikes: old ones

Mentioned: 242 Post(s)
Tagged: 0 Thread(s)
Quoted: 15294 Post(s)
Liked 216 Times in 186 Posts
...like Mr IGH, I had some seating issues in the frame I used, so if you have the luxury of time, you might want to install the conversion kit first, and then measure the resulting width of what you end up with in terms of whether a 68 will work, or whether something a little wider or more universal (68-73) might be advisable in your selection of a spindle unit. Also, try to be smarter than me and put the correctly threaded sides in their respective positions the first time.

Otherwise, as stated above, it's not a big deal what you use, so long as you get the correct spindle length for your chosen crank that maintains a good chainline.
3alarmer is offline  
Old 10-30-14, 03:07 PM
  #11  
3alarmer
******
 
3alarmer's Avatar
 
Join Date: Nov 2010
Location: The Big Tomato
Posts: 17,557

Bikes: old ones

Mentioned: 242 Post(s)
Tagged: 0 Thread(s)
Quoted: 15294 Post(s)
Liked 216 Times in 186 Posts
Originally Posted by Mr IGH View Post
The author spends a bunch of time making a press, I tapped the adapter cups in with wood and a 3lb hammer, worked well for me.
...IIRC, I think I adapted a headset cup screw press using some kinda oversized washers.
3alarmer is offline  
Old 10-30-14, 03:46 PM
  #12  
top506
Death fork? Naaaah!!
 
top506's Avatar
 
Join Date: Nov 2005
Location: The other Maine, north of RT 2
Posts: 4,642

Bikes: Seriously downsizing.

Mentioned: 33 Post(s)
Tagged: 0 Thread(s)
Quoted: 308 Post(s)
Likes: 0
Liked 19 Times in 15 Posts
Originally Posted by Scooper View Post
My '73 Super Sport conversion using the TruVative adapter was completely painless.
As was mine, but I don't remember if I used the TruVative adapter or the Cycle Ops one. In any case, the BB shell of the '73 SS I adapted did not have the ridge in the BB shell an earlier poster reported, nor does the early '70s SS I'm working on now.

Top
__________________
You know it's going to be a good day when the stem and seatpost come right out.

(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)
top506 is offline  
Old 10-30-14, 03:59 PM
  #13  
Scooper
Decrepit Member
 
Scooper's Avatar
 
Join Date: Aug 2005
Location: Santa Rosa, California
Posts: 10,490

Bikes: Waterford 953 RS-22, several Paramounts

Mentioned: 65 Post(s)
Tagged: 0 Thread(s)
Quoted: 616 Post(s)
Likes: 0
Liked 3 Times in 3 Posts
Here's a close-up of my BB shell before installing the adapter; there are no internal ridges or other interference in my '73 SS.

__________________
- Stan

my bikes

Science doesn't care what you believe.
Scooper is offline  
Old 10-30-14, 04:43 PM
  #14  
Mr IGH
afraid of whales
 
Mr IGH's Avatar
 
Join Date: Apr 2009
Location: Front Range, CO
Posts: 4,307
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 346 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The green SS frame with ridge in my picture was a 1970, my wife's yellow 1971 had the ridge and a 1973 SS I converted had the ridge. I've never seen a SS without the BB ridge. I've had quite a few SS and ST frames over the years:


Last edited by Mr IGH; 10-31-14 at 08:53 AM.
Mr IGH is offline  
Old 10-30-14, 08:20 PM
  #15  
dddd
Ride, Wrench, Swap, Race
 
dddd's Avatar
 
Join Date: Jan 2010
Location: Northern California
Posts: 6,672

Bikes: Cheltenham-Pederson racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.

Mentioned: 85 Post(s)
Tagged: 0 Thread(s)
Quoted: 606 Post(s)
Likes: 0
Liked 39 Times in 37 Posts
Considering that the original cranks have useful chainring sizes and will work flawlessly with modern 9-speed chain, I would only change out the crankset on one of these bikes if I couldn't find any good pedals with 1/2" threads for my usage. I have always been able to source 1/2"-threaded clipless pedals whenever I put a good Schwinn on the road.

Schwinn's patented 39-52t chainring assembly works for me here with many of my usual freewheels choices, so I enjoy the original crank's creak-free performance, looks and durability, though I usually remove the chainring guard for weight saving and appearance considerations.

I'd like to think that one's perception of these one-piece cranks is perhaps put into better perspective by seeing a carefully assembled bike with original crankset still in place, so take a look and make your decision. Remember also that the adaptors have considerable weight of their own that gets added to the bike. Perhaps someone else can chime in as to whether the adaptors limit the tightening torque that can be applied to the fixed cup during installation.
Note that removing the chainring guard requires five suitably-sized washers to achieve torque on the chainring bolts.


dddd is offline  
Old 10-31-14, 09:19 AM
  #16  
John E
feros ferio
 
John E's Avatar
 
Join Date: Jul 2000
Location: www.ci.encinitas.ca.us
Posts: 19,514

Bikes: 1959 & 1960 Capo; 1982 Bianchi; 1988 Schwinn KOM-10;

Mentioned: 32 Post(s)
Tagged: 0 Thread(s)
Quoted: 723 Post(s)
Liked 47 Times in 43 Posts
Originally Posted by dddd View Post
Considering that the original cranks have useful chainring sizes and will work flawlessly with modern 9-speed chain, I would only change out the crankset on one of these bikes if I couldn't find any good pedals with 1/2" threads for my usage. I have always been able to source 1/2"-threaded clipless pedals whenever I put a good Schwinn on the road.

Schwinn's patented 39-52t chainring assembly works for me here with many of my usual freewheels choices, so I enjoy the original crank's creak-free performance, looks and durability, though I usually remove the chainring guard for weight saving and appearance considerations.

I'd like to think that one's perception of these one-piece cranks is perhaps put into better perspective by seeing a carefully assembled bike with original crankset still in place, so take a look and make your decision. Remember also that the adaptors have considerable weight of their own that gets added to the bike. Perhaps someone else can chime in as to whether the adaptors limit the tightening torque that can be applied to the fixed cup during installation.
Note that removing the chainring guard requires five suitably-sized washers to achieve torque on the chainring bolts.


Very nice-looking Campus Green Schwinns, although I might be inclined to put barcons on the SS. The Presta valves are a great touch.
__________________
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324
Capo: 1960 Sieger (2), S/N 42624, 42597
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
John E is offline  
Old 10-31-14, 09:25 AM
  #17  
The Golden Boy 
Extraordinary Magnitude
 
The Golden Boy's Avatar
 
Join Date: Aug 2009
Location: Waukesha WI
Posts: 11,541

Bikes: 1977 Trek TX700; 1978/79 Trek 736; 1984 Specialized Stumpjumper Sport; 1984 Schwinn Voyageur SP; 1985 Trek 620; 1985 Trek 720; 1986 Trek 400 Elance; 1987 Schwinn High Sierra; 1990 Miyata 1000LT

Mentioned: 73 Post(s)
Tagged: 0 Thread(s)
Quoted: 1789 Post(s)
Liked 101 Times in 82 Posts
Fillet Brazed bottom bracket shells are sexy.

Originally Posted by Scooper View Post
__________________
*Recipient of the 2006 Time Magazine "Person Of The Year" Award*

Commence to jigglin’ huh?!?!

"But hey, always love to hear from opinionated amateurs." -says some guy to Mr. Marshall.
The Golden Boy is offline  
Old 10-31-14, 10:17 AM
  #18  
dddd
Ride, Wrench, Swap, Race
 
dddd's Avatar
 
Join Date: Jan 2010
Location: Northern California
Posts: 6,672

Bikes: Cheltenham-Pederson racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.

Mentioned: 85 Post(s)
Tagged: 0 Thread(s)
Quoted: 606 Post(s)
Likes: 0
Liked 39 Times in 37 Posts
Originally Posted by The Golden Boy View Post
Fillet Brazed bottom bracket shells are sexy.
Yes, very organic-looking, especially after the smoothing effect of your bike's powdercoat.

Bling alert on what seems like a redundancy in the cable-guiding hardware(?). Same reason that I chose the REG bottle cage btw.
Admittedly there is pure function in your front derailer cable housing now being unable to trap water inside.
dddd is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Stephan SS
Classic & Vintage
1
01-22-18 05:53 PM
jorglueke
Classic & Vintage
5
10-16-16 06:15 PM
glandreman
Classic and Vintage Bicycles: Whats it Worth? Appraisals.
13
09-10-15 06:41 PM
Bowker
Classic & Vintage
8
11-15-14 07:24 PM
madha77er
Classic & Vintage
20
07-07-10 09:43 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.