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

French Bottom Bracket issues

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.

French Bottom Bracket issues

Old 05-25-10, 08:18 AM
  #1  
wtgrantham
Senior Member
Thread Starter
 
wtgrantham's Avatar
 
Join Date: Dec 2008
Posts: 169
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
French Bottom Bracket issues

I have a 1973 Gitane TDF that I restored and am having problems with the bottom bracket. I can tighten the cup enough to eliminate the "horizontal" play, but it still will rock back and forth (vertically) a tiny bit, if I tighten it where this stops I can tell it is dragging on the bearings. Can I assume the bottom bracket is shot? would it indicate bad cups, bad spindle or a combination of both (I have replaced the bearings)?

It is a stronglight BB and I think the spindle is 118 mm. Velo Orange has french BBs but their spindle size that is close is 116 or 122 would either of these be OK? They are also JIS taper, I am using a stronglight crankset, will these match up?

Any tips on what tool and technique for removing fixed cup?

Thanks
wtgrantham is offline  
Old 05-25-10, 08:27 AM
  #2  
Ex Pres 
#39
 
Ex Pres's Avatar
 
Join Date: Dec 2007
Location: Mountain Brook, AL
Posts: 7,070
Mentioned: 23 Post(s)
Tagged: 0 Thread(s)
Quoted: 327 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Which Stronglight crankset? Early ones like the Mod93 if original to the bike are ISO, recent models are often JIS.

If you replace ISO with a JIS, you have a couple of issues in measurement. Your spindle is offset +2mm to the drive side. The VO is not. But JIS gives you a wider chainline. So, take (118.5mm +2mm) less 6mm (ISO-JIS diff) = 114.5mm. I'd go with the 116mm.

I'm actually running a Mod104 on a 118mm JIS Shimano (English thread frame), and my chainline is just a little wide, but not much.

Look for Sheldon Brown's fixed cup removal tool. I've used it. Maybe $6? worth of bolt, nut and washers from the hardware store. Works like a charm.
__________________
72 Frejus, Holdsworth Record & special CNC / 74 Italvega NR / c80 ?French? / 82 Raleigh Intl MkII / 83 Trek 620 / 87 Centurion IM MV / 03 Casati Dardo / 08 BF IRO / 09 Dogma FPX / 10 Vassago Fisticuff

Ex Pres is online now  
Old 05-25-10, 11:42 AM
  #3  
cnnrmccloskey
Senior Member
 
cnnrmccloskey's Avatar
 
Join Date: May 2009
Location: Portland Oregon
Posts: 745

Bikes: '82 Giante super challange, 70 Gitane Tour de France, GT Gutterball

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by wtgrantham View Post
I have a 1973 Gitane TDF that I restored and am having problems with the bottom bracket. I can tighten the cup enough to eliminate the "horizontal" play, but it still will rock back and forth (vertically) a tiny bit, if I tighten it where this stops I can tell it is dragging on the bearings. Can I assume the bottom bracket is shot? would it indicate bad cups, bad spindle or a combination of both (I have replaced the bearings)?

It is a stronglight BB and I think the spindle is 118 mm. Velo Orange has french BBs but their spindle size that is close is 116 or 122 would either of these be OK? They are also JIS taper, I am using a stronglight crankset, will these match up?

Any tips on what tool and technique for removing fixed cup?

Thanks
I'm having a hard time imagining what your describing as horizontal and vertical play, do you mean play when the cranks are in a vertical position (parrallel to the seattube) without play in the horizontal position? In that case it is likely that your BB is toast and will need replacment, if the drag in the final adjustment without play is not too much I would just keep using it til It goes, I have a 1970 tdf and the bottom bracket isn't in great shape but I keep using it, someday I'll get the VO bb.
cnnrmccloskey is offline  
Old 05-25-10, 02:35 PM
  #4  
Grand Bois
Senior Member
 
Grand Bois's Avatar
 
Join Date: Mar 2005
Location: Pinole, CA, USA
Posts: 17,421
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 428 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The Velo Orange BB will not work for you because the taper is JIS. Your French crank requires an ISO taper. I see French threaded cups and 118mm spindles on eBay all the time. It's a common size, since all of the old French doubles used it. There's a used French threaded Mavic cartridge BB on eBay right now.

As for removing the fixed cup.....



Grand Bois is offline  
Old 06-01-10, 01:57 AM
  #5  
bluedragon0
Junior Member
 
Join Date: Mar 2010
Location: Austin, TX
Posts: 10

Bikes: Full Force Slick Rock

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The problem is its French!
bluedragon0 is offline  
Old 06-01-10, 08:45 AM
  #6  
cudak888 
www.theheadbadge.com
 
cudak888's Avatar
 
Join Date: Sep 2005
Location: Southern Florida
Posts: 23,121

Bikes: http://www.theheadbadge.com

Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
Quoted: 173 Post(s)
Liked 2 Times in 2 Posts
What size bearings did you use, and how many of them?

-Kurt
__________________
cudak888 is offline  
Old 06-01-10, 10:41 AM
  #7  
velo-orange
Guest
 
Posts: n/a
Mentioned: Post(s)
Tagged: Thread(s)
Quoted: Post(s)
An ISO crank on a JIS spindle is a 'B' fit. The ISO crank will sit ~4.5mm further out on a JIS spindle. Phil makes ISO spindles and their cups are seperate from the BB so french threaded rings can be mated for a perfect setup. They are the only mfg that I know of that currently makes them.
 

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.