Vitus 979 question
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Vitus 979 question
Hi,
I am wondering what Vitus owners have done for front derailleurs? My Vitus appears to have a 28.0mm seat tube outer diameter, rather than the more common 28.6mm. Any advice? Also, what bottom bracket width works best? 68 x ??
Thank you,
Stevie B
I am wondering what Vitus owners have done for front derailleurs? My Vitus appears to have a 28.0mm seat tube outer diameter, rather than the more common 28.6mm. Any advice? Also, what bottom bracket width works best? 68 x ??
Thank you,
Stevie B
#2
~>~
Mine Fits the standard for the period 28.6mm Fr Derail w/ a BSC 68mm BB, some were not "English". One has to measure with that handy caliper and check threading.
-Bandera
Last edited by Bandera; 08-18-15 at 08:57 AM. Reason: edit: Fits not Is
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Pretty sure mine is 28.6. Using a Campagnolo fd. I'm also using a Velo Orange French thread cartridge bb
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1984 Gitane Tour de France; 1968 Peugeot PL8; 1982 Nishiki Marina 12; 1984 Peugeot PSV; 1993 Trek 950 mtb; 1983 Vitus 979; Colnago Super, mid-80's Bianchi Veloce, 1984 or 85 Vitus 979
1984 Gitane Tour de France; 1968 Peugeot PL8; 1982 Nishiki Marina 12; 1984 Peugeot PSV; 1993 Trek 950 mtb; 1983 Vitus 979; Colnago Super, mid-80's Bianchi Veloce, 1984 or 85 Vitus 979
#5
Death fork? Naaaah!!
Mine has a standard 28.6 Superb Pro.
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Yessir Mr. Bandera, I measured with my handy-dandy digital calipers. The seat tube OD is 28.2 or 28.3mm, but definitely not your standard 28.6mm. Thank you
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Thank you Scozim! Yours may be a later model...
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you're caliper is off then. if it had an odd diameter ST like that it would come with a braze on tab. there is no such thing as a clamp on 28.2 or .3 to my knowledge.
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There should be enough gap on the ends of most FD clamps to allow for any slight ST undersizing as you can also use some shimming materials to make up for any gaps.
It's when your seat tube is slightly oversized when you have to worry about, as some FD clamp bodies are quite thick and can put dents on your seat tube if you try to force it on.......
It's when your seat tube is slightly oversized when you have to worry about, as some FD clamp bodies are quite thick and can put dents on your seat tube if you try to force it on.......
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No sir--my digital caliper does not lie. It speaks the truth. Also tested a standard 28.6mm clamp front derailleur on the tube but no dice...way too loose.
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Can you shim it? My 979 is a 1983. What FD are you using?
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1984 Gitane Tour de France; 1968 Peugeot PL8; 1982 Nishiki Marina 12; 1984 Peugeot PSV; 1993 Trek 950 mtb; 1983 Vitus 979; Colnago Super, mid-80's Bianchi Veloce, 1984 or 85 Vitus 979
1984 Gitane Tour de France; 1968 Peugeot PL8; 1982 Nishiki Marina 12; 1984 Peugeot PSV; 1993 Trek 950 mtb; 1983 Vitus 979; Colnago Super, mid-80's Bianchi Veloce, 1984 or 85 Vitus 979
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I have an old Shimano FD TY15-SS triple that is 28.0-28.6 adjustable. It's yours for the shipping cost if you want it.
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Are you sure it is a Vitus? If so, what year is it? The Stronglight/Altec clones had an oddball tube size. I have had quite a range of Vitus frames, and all of them have been the 28.6. I have never had my hands on a first gen one, these had an embossed fork instead of a sticker.
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Thank you 88prelude. What model derailleur is that?
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Yes, that is about the same diameter as my Vitus--thanks Chuckk! Looks like your Vitus has a Shimano 600 derailleur installed.
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According to Velobase (VeloBase.com - Component: Shimano FD-TY15, Tourney) it's a Tourney and made around 1995 - makes sense as it's stamped made in China. I was thinking it was older than that. It's not a beauty but it works.
#17
~>~
A glance reminded me that the AL tubes on a Vitus 979 are not a single OD but flare significantly at the BB and HT.
So what is the OD at the Fr Der mounting height?
Measuring just above the BB, just below the Fr derail and just below the seatube/TT fitting : 30.4 28.4 28.6
How does that compare to steel lugged frames? I have three to measure, and did.
531 28.6
SL 28.7
Prestige 28.7
Looking at the 28.6 DA Fr Derail mounted firmly on my 979 the fitting shows a gap in the mounting clamp so it's not barely fixed in place.
Puzzled that your 979 does not accept a 28.6 as we built lots of 979's to that spec "back when" as it was the go-to frameset for small/light riders and never had a problem.
Got any pics?
-Bandera
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There should be enough gap on the ends of most FD clamps to allow for any slight ST undersizing as you can also use some shimming materials to make up for any gaps.
It's when your seat tube is slightly oversized when you have to worry about, as some FD clamp bodies are quite thick and can put dents on your seat tube if you try to force it on.......
It's when your seat tube is slightly oversized when you have to worry about, as some FD clamp bodies are quite thick and can put dents on your seat tube if you try to force it on.......
I believe that the Simplex used on Peugeots is identical to the one used on low end Raleighs.