TA bottom bracket marked 'P FG'?
02-13-18 | 12:52 PM
#1
Thread Starter
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Joined: Nov 2016
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From: Berkeley, CA
TA bottom bracket marked 'P FG'?
This is a TA French threaded bottom bracket off a weird 1980s Motobecane mountain bike. Came with a 175mm TA triple crank. I'm curious as to what 'P FG' means--I poked around the web and found a guide to TA BB markings (Specialites T.A. - bottom brackets), but this wasn't on it. Any help is much appreciated.
Photos: https://imgur.com/gallery/vbEcp
Photos: https://imgur.com/gallery/vbEcp
02-13-18 | 01:07 PM
#2
Senior Member
Joined: Jul 2009
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This is a TA French threaded bottom bracket off a weird 1980s Motobecane mountain bike. Came with a 175mm TA triple crank. I'm curious as to what 'P FG' means--I poked around the web and found a guide to TA BB markings (Specialites T.A. - bottom brackets), but this wasn't on it. Any help is much appreciated.
One ring on a TA cup means metric thread, and FG might mean "filetage à gauche" for left-hand thread. Not sure about the P though.
02-13-18 | 01:17 PM
#3
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From: Alta California
+1
The old Specialitees T.A. thread code was ring(s)/groove(s) on faces of cups. Two concentric rings was BSC/ISO, one concentric ring was metric/French and no ring was Italian. So the cup set in the photo would be metric. In the past T.A. did not offer a Swiss cup. Perhaps T.A. added one at some point...
A capital letter P is employed by Japan as part of a Swiss designation. Their full Swiss designation is 35 X P1 S1. Their metric/French designation is 35 X P1.
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Last edited by juvela; 02-13-18 at 06:16 PM. Reason: addition
02-13-18 | 03:41 PM
#5
Thrifty Bill
Joined: Jan 2008
Posts: 23,645
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From: Mans of NC & SW UT Desert
Bikes: 86 Katakura Silk, 87 Prologue X2, 88 Cimarron LE, 1975 Sekai 4000 Professional, 73 Paramount, plus more
Motobecane loved Swiss threading, I have found it on their bikes from 1977 to 1984. Most french manufacturers did it for a year or two. Not Motobecane. Its kind of my "secret source" for swiss BBs'. Find a donor Motobecane, get a swiss BB, french headset, and french stem.
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Please don't confuse ebay "asking" prices with "selling" prices. Many sellers never get their ask price. some are far from it. Value is determined once an item actually SELLS. Its easy enough to check SOLD prices.
02-13-18 | 09:41 PM
#7
Thrifty Bill
Joined: Jan 2008
Posts: 23,645
Likes: 1,109
From: Mans of NC & SW UT Desert
Bikes: 86 Katakura Silk, 87 Prologue X2, 88 Cimarron LE, 1975 Sekai 4000 Professional, 73 Paramount, plus more
I've seen it on all of them, except the two tandems I have. Of course, I skip the cottered crank models. I also avoid the top of the line as far as using for parts (too valuable complete).
