Cup and Cone Bottom Bracket Question
07-06-18 | 10:13 AM
#1
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From: Upstate New York
Bikes: 1976 Motobecane Grand Jubile, Austro Daimler 'Ultima', 2012 Salsa Vaya, 2009 Trek 4300, Fyxation Eastside, State Matte Black 6, '97 Trek 930 SHX, '93 Specialized Rockhopper, 1990 Trek 950
Cup and Cone Bottom Bracket Question
I know pretty much nothing about vintage bottom brackets. Here are a couple pics of the existing bottom bracket from a bike I recently picked up. Is this definitely an English threaded bottom bracket? There is an "F" stamped on the bottom bracket shell, which I took to mean "French".
07-06-18 | 10:22 AM
#2
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07-06-18 | 12:19 PM
#3
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I know pretty much nothing about vintage bottom brackets. Here are a couple pics of the existing bottom bracket from a bike I recently picked up. Is this definitely an English threaded bottom bracket? There is an "F" stamped on the bottom bracket shell, which I took to mean "French".
What is the brand name, and approximate year the frame was made? I think using that info to research on Sheldon's site will get you the info you need to know. Based on the thread size stamped on the cups, it would appear to be British ISO. However, if it's a Raleigh frame...they are a British manufacturer but used their own BB thread standard.
Dan
Last edited by _ForceD_; 07-06-18 at 12:23 PM.
07-06-18 | 12:26 PM
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From: Rexburg, ID
Bikes: '86 Schwinn Prelude, '86 Maruishi Excellence, '88 Cannondale SR2000, '16 Specialized Fuse XD, '24 State 4130 fixed
The bike is the unknown Austro Daimler. Mine had a very normal 68mm English bottom bracket. That one is English too.
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07-06-18 | 12:46 PM
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Bikes: 1976 Motobecane Grand Jubile, Austro Daimler 'Ultima', 2012 Salsa Vaya, 2009 Trek 4300, Fyxation Eastside, State Matte Black 6, '97 Trek 930 SHX, '93 Specialized Rockhopper, 1990 Trek 950
Now I wonder what the "F" on the frame stands for........
07-06-18 | 01:10 PM
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Yep. It's the mystery AD. And thank you everybody. It's a relief that I don't have to deal with a French thread on this frame. The current bottom bracket is in fine condition, but I was going to search out a backup if it turned out to be French.
Now I wonder what the "F" on the frame stands for........
Now I wonder what the "F" on the frame stands for........
Austro Daimler SLE project
Dan
07-06-18 | 01:11 PM
#7
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From: Rexburg, ID
Bikes: '86 Schwinn Prelude, '86 Maruishi Excellence, '88 Cannondale SR2000, '16 Specialized Fuse XD, '24 State 4130 fixed
The F on the frame is confuzzling me a bit. According to this: My Austro-Daimler "Vent Noir II" Bicycle And Brief History of Steyr Daimler Puch, the F SHOULD indicate that the BB is french threaded, but the Shimano that's currently in there says otherwise. The F should also be on the underside of the lug. The way I knew mine was English was by the knurling on the Nervar lockring, but that doesn't apply here. I would pull the fixed cup to be sure. I would bet on it being English, but Velo Orange sells french threaded bottom brackets.
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07-06-18 | 01:22 PM
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It wouldn't be the first time something marked one way was built another way. I could see something forcing a BSA bb into a Swiss shell, but French is right threaded on the DS.
Easy enough to take out the NDS cup and look, though.
Easy enough to take out the NDS cup and look, though.
07-06-18 | 01:26 PM
#9
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From: Upstate New York
Bikes: 1976 Motobecane Grand Jubile, Austro Daimler 'Ultima', 2012 Salsa Vaya, 2009 Trek 4300, Fyxation Eastside, State Matte Black 6, '97 Trek 930 SHX, '93 Specialized Rockhopper, 1990 Trek 950
The F on the frame is confuzzling me a bit. According to this: My Austro-Daimler "Vent Noir II" Bicycle And Brief History of Steyr Daimler Puch, the F SHOULD indicate that the BB is french threaded, but the Shimano that's currently in there says otherwise. The F should also be on the underside of the lug. The way I knew mine was English was by the knurling on the Nervar lockring, but that doesn't apply here. I would pull the fixed cup to be sure. I would bet on it being English, but Velo Orange sells french threaded bottom brackets.
Is it okay to remove just the fixed cup to check, or do I need to start on the opposite side?
07-06-18 | 01:40 PM
#10
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From: Rexburg, ID
Bikes: '86 Schwinn Prelude, '86 Maruishi Excellence, '88 Cannondale SR2000, '16 Specialized Fuse XD, '24 State 4130 fixed
Start on whichever side you want, the bike shouldn't care.
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07-06-18 | 02:24 PM
#11
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From: Upstate New York
Bikes: 1976 Motobecane Grand Jubile, Austro Daimler 'Ultima', 2012 Salsa Vaya, 2009 Trek 4300, Fyxation Eastside, State Matte Black 6, '97 Trek 930 SHX, '93 Specialized Rockhopper, 1990 Trek 950
07-07-18 | 05:20 AM
#13
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Regardless of the 'F', it's definitely not a French-threaded (or even a Swiss-threaded) bottom bracket: those have 35mm x 1 threading, and are usually marked as such. Yours being marked with the English threading information (1.37 x 24) absolutely identifies it as having English threading.
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