Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

BB = 70mm + English threading?

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

BB = 70mm + English threading?

Old 03-13-06, 03:03 PM
  #1  
Matthew A Brown
this bike is an aqueduct
Thread Starter
 
Matthew A Brown's Avatar
 
Join Date: Jan 2004
Location: Gainesville, FL
Posts: 1,073

Bikes: Villin custom touring, Medici Pro Pista, KHS Alite1000, Windsor fixed commuter

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
No, really. = )


The bike is a early 80s Medici track frame. The BB width is 70mm, and I'll be booger'd if it ain't threaded English.

I'm hoping to build the fella up by this weekend. A friend in town has a nice Enlish threaded Sugino NJS 75 track BB, and if I could make that work I'd be thrilled. I'm not as educated as I'd like to be on BB construction, so looking for a little wisdom here.

The questions: Can this work? Will the BB just sit inside the shell by that 1mm on either side, or 2mm on one side? Are there any differences in an Italian vs English spindle besides the taper? (I already have an Italian crankset.) Am I crazy?

Thanks!

Matt
__________________
Villin custom touring | Raleigh XXIX | Medici Pro Pista | 1978 Schwinn Stingray

Last edited by Matthew A Brown; 03-13-06 at 03:14 PM.
Matthew A Brown is offline  
Old 03-13-06, 08:58 PM
  #2  
John E
feros ferio
 
John E's Avatar
 
Join Date: Jul 2000
Location: www.ci.encinitas.ca.us
Posts: 19,235

Bikes: 1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;

Mentioned: 28 Post(s)
Tagged: 0 Thread(s)
Quoted: 658 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
1) spindle taper: I have generally had good luck intermixing Italian, French, and Sugino (but not Shimano!) cranksets and spindles. Everyone uses a 2-degree taper, but there are two different cut-off end sizes.
2) bearing adjustment range: There are three variables here: bottom bracket shell width (70mm in your case), spacing between spindle bearing cones, and thickness of BB cups. A spindle designed for an English BB and thin cups should work with thick cups in your 70mm BB. Otherwise, you MAY be able to run in your adjustable cup far enough for a proper amount of bearing play, but I suspect you'll pretty much run out of threads for the lockring. Try it and see; you can easily dry-assemble the BB externally and hold it up against your BB shell for a test-fit. This will let you experiment with various combinations of cups and spindles before taking the time to put something together with grease.
__________________
"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, S/N 42624
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1981 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
John E is offline  
Old 03-13-06, 09:10 PM
  #3  
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 31,342

Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!

Mentioned: 30 Post(s)
Tagged: 0 Thread(s)
Quoted: 1089 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
One possibility is to take the frame to a good shop and have 1mm taken off each side of the bb shell with a facing tool.
HillRider is offline  
Old 03-13-06, 10:40 PM
  #4  
Matthew A Brown
this bike is an aqueduct
Thread Starter
 
Matthew A Brown's Avatar
 
Join Date: Jan 2004
Location: Gainesville, FL
Posts: 1,073

Bikes: Villin custom touring, Medici Pro Pista, KHS Alite1000, Windsor fixed commuter

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Wow, great posts. Did not know there were different cup sizes. And my local bike guy builds frames, so the facing tool thing could happen pretty easily.

Thanks!
__________________
Villin custom touring | Raleigh XXIX | Medici Pro Pista | 1978 Schwinn Stingray
Matthew A Brown is offline  
Old 03-14-06, 09:29 AM
  #5  
Toki
Senior Member
 
Join Date: Sep 2003
Location: Los Angeles
Posts: 145

Bikes: Old Hard Rock, New Cannondale R400

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
This is not such an odd thing, I was going to post something similar in a day or two!

I have an old bike with English threading and a 70mm shell. However, I was just looking at swapping out the old with a cartridge. Not to try and hijack this thread, but is it possible to get either a 68mm or 73mm to fit the 70mm shell? If so, which one would be better?

As an alternative, could I just buy cups and spindle separately and "roll my own"? I would prefer the cartridge because I am trying to keep costs down on this project.

And if neither works, what can I expect an LBS to charge for facing and chasing the BB to get down to 68mm? (for those of us who are not luck enough to know frame builders).
Toki is offline  
Old 03-14-06, 12:29 PM
  #6  
Matthew A Brown
this bike is an aqueduct
Thread Starter
 
Matthew A Brown's Avatar
 
Join Date: Jan 2004
Location: Gainesville, FL
Posts: 1,073

Bikes: Villin custom touring, Medici Pro Pista, KHS Alite1000, Windsor fixed commuter

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
No worries about the hijack. The easy answer might be to buy the Phil, but I'd like for that to be the last option. I'll keep this thread updated as I go; gonna spend some time at the shop this afternoon.


And a ditto on the "roll your own", is an English-threaded/Campy-tapered BB impossible or silly in some way I don't know?
__________________
Villin custom touring | Raleigh XXIX | Medici Pro Pista | 1978 Schwinn Stingray
Matthew A Brown is offline  
Old 03-14-06, 01:29 PM
  #7  
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 31,342

Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!

Mentioned: 30 Post(s)
Tagged: 0 Thread(s)
Quoted: 1089 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Matthew A Brown
....is an English-threaded/Campy-tapered BB impossible or silly in some way I don't know?
Why not? I'm sure Campy actually made English threaded version of nearly all their bottom brackets, both cartridge and cup and cone.
HillRider is offline  

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.