Does FN mean French Thread?
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Does FN mean French Thread?
Please say it doesn't, I want to buy this freewheel.
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#2
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OK, "It doesn't."
Unfortunately, I fear it just might, particularly if they denote English-thread freewheels "BSC" or "BSA."
Unfortunately, I fear it just might, particularly if they denote English-thread freewheels "BSC" or "BSA."
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"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; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
"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; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
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Yeah it probably does.... bu I just had a whacky idea.... take cogs off this freewheel and put them on my freewheel....
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maybe yes, but since I'm only guessing I'll guess "no", based on the confusion that arises on Campy parts where "F" seems to mean "fine thread" (versus coarse thread) and not French. What make is this FW? That could help rule it out if it's one that didn't offer FR threading.
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maybe yes, but since I'm only guessing I'll guess "no", based on the confusion that arises on Campy parts where "F" seems to mean "fine thread" (versus coarse thread) and not French. What make is this FW? That could help rule it out if it's one that didn't offer FR threading.
I am guessing that John E might be right since I have seen the boxes with ISO in place of the FN...
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FWIW, I had a French threaded Regina that was stamped FF.
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Typically, Refina used FF to denote French threads, as stated in the previous post. FI was used for English threads. Italian threaded freewheels had no designation. When they went to the grooves for marking freewheels, they intoduced a 4th, ISO threading. So an educated guess would be that FN is ISO threading which is compatible with everything but French threaded hubs.
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perfect, thanks T-mar. I bought the freewheel.
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Hopefully, my educated guess was correct. Let us know when you receive it.
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I am fairly certain now that it means english as some research shows that in 1978 they had italian, english, french and ISO threading. Since in italian english is something like inglais and presumably FI denotes italian threading it only makes sense that they would take the second letter such that FN means english.
This is just an educated guess though.
This is just an educated guess though.
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I am fairly certain now that it means english as some research shows that in 1978 they had italian, english, french and ISO threading. Since in italian english is something like inglais and presumably FI denotes italian threading it only makes sense that they would take the second letter such that FN means english.
This is just an educated guess though.
This is just an educated guess though.
English threads = filetto Inglese = FI
French threads - filetto Francese = FF
By process of elimination, presumibly FN = ISO threads, though I don't now now the N translates.
#13
feros ferio
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I am always amused that our 99% metric world eventually standardized primarily on English system thread and diameter standards for bicycle framesets.
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"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; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
"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; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
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" freewheel threading, I thought English = ISO. Italian and English differed only in the bevel cut of the threads"
Correct, but it's all about the timing: prior to the adoption of the British/English threading by the ISO as their standard, the correct designation would be BSC ( for British Standard Cycle), so it all comes down to what age hub/FW you refer to. And that 1.37" by 24 tpi is so close to the Italian threading EXCEPT for the angle of the thread profile (in cross-section) that they are *practically* interchangeable...but not to a purist.
Inches in a Metric world...crazy...
still, you want my version of What Is Crazy: the Metric System Inventors (the French) chose 35mm x 1mm for their BB standard, but 34.7mm (!!) x 1mm for their hub/FW standard, that's totally whack.
Correct, but it's all about the timing: prior to the adoption of the British/English threading by the ISO as their standard, the correct designation would be BSC ( for British Standard Cycle), so it all comes down to what age hub/FW you refer to. And that 1.37" by 24 tpi is so close to the Italian threading EXCEPT for the angle of the thread profile (in cross-section) that they are *practically* interchangeable...but not to a purist.
Inches in a Metric world...crazy...
still, you want my version of What Is Crazy: the Metric System Inventors (the French) chose 35mm x 1mm for their BB standard, but 34.7mm (!!) x 1mm for their hub/FW standard, that's totally whack.
Last edited by unworthy1; 02-13-08 at 12:39 AM.
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Well the 1978 Regina Catalog lists all 4 thread types... they have close ups with detailed geometries of the threads... the english and italian are sharp while the ridges are more round on the ISO and french. I'd have to check again to see if ISO and english actually differed dimensionally, but as usual that will have to wait.
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English/BSC and ISO are similar but not the same. Both use a 60 degree included angle but ISO has a larger nominal diameter of 1.375" versus 1.370" for English. The roots and crests of ISO threads are flat while English/BSC has rounded crests and roots. In this case, ISO is intermediate threading that mates well with both Italian and English/BSC.
When the ISO standards were created, the committee looked at all the conventions and made their decisions based on which would have the least impact on the industry. Since BSC threading had been adopted by the Asians, who were producing the majority of the world's bicycles at the time, most but not all of the ISO bicycle thread standards use, or are compatible with, English/BSC. For instance, the selected standard for dropout hangers is the metric 10mm x 1mm thread, as most of the world followed the French practice. In some cases, there are both primary and secondary standards (i.e. 9/16" and 1/2" pedal threads).
Another thing to clear up is that French is not the "oddball" threading. That honor belongs to the Italians, courtesy of Campagnolo, who combined a metric nominal diameter with an imperial thread count (i.e Italian freewheel threads are 35mm x 24 TPI). Every public school student knows that you do not mix imperial and metric measurements, but this apparently escaped Tullio and his countrymen. And of course the Italians continue to perpetuate the non-standardization of bicycle parts by continuing to build new bicycles with Italian threading.
When the ISO standards were created, the committee looked at all the conventions and made their decisions based on which would have the least impact on the industry. Since BSC threading had been adopted by the Asians, who were producing the majority of the world's bicycles at the time, most but not all of the ISO bicycle thread standards use, or are compatible with, English/BSC. For instance, the selected standard for dropout hangers is the metric 10mm x 1mm thread, as most of the world followed the French practice. In some cases, there are both primary and secondary standards (i.e. 9/16" and 1/2" pedal threads).
Another thing to clear up is that French is not the "oddball" threading. That honor belongs to the Italians, courtesy of Campagnolo, who combined a metric nominal diameter with an imperial thread count (i.e Italian freewheel threads are 35mm x 24 TPI). Every public school student knows that you do not mix imperial and metric measurements, but this apparently escaped Tullio and his countrymen. And of course the Italians continue to perpetuate the non-standardization of bicycle parts by continuing to build new bicycles with Italian threading.
#18
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Thanks for the great information. I thought I had all the different threadings figured out but was stumped by some track cogs I found. It makes sense now that some are Italian (so close to ISO but not quite 'right') and French (I couldn't understand why the French BB cup was too large).