What frames use(d) a 25.0mm seatpost?
12-14-23, 05:08 AM
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What frames use(d) a 25.0mm seatpost?
Just picked up a Zeus 25mm post, single-bolt, no flutes, nicely made, made me think:
What bikes or frames of quality would use this size?
What bikes or frames of quality would use this size?
12-14-23, 05:49 AM
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12-14-23, 05:59 AM
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Early carbon fiber frames in addition to those mentioned above, maybe?
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1987 Crest Cannondale, 1987 Basso Gap, 1992 Rossin Performance EL, 1990ish Van Tuyl, 1985 Trek 670, 1982 AD SLE, 2003 Pinarello Surprise, 1990ish MBK Atlantique, 1987 Peugeot Competition, 1987 Nishiki Tri-A, 1981 Faggin, 1996 Cannondale M500, 1984 Mercian, 1982 AD SuperLeicht, 1985 Massi (model unknown), 1988 Daccordi Griffe , 1989 Fauxsin MTB, 1981 Ciocc Mockba, 1992 Bianchi Giro, 1977 Colnago Super
1987 Crest Cannondale, 1987 Basso Gap, 1992 Rossin Performance EL, 1990ish Van Tuyl, 1985 Trek 670, 1982 AD SLE, 2003 Pinarello Surprise, 1990ish MBK Atlantique, 1987 Peugeot Competition, 1987 Nishiki Tri-A, 1981 Faggin, 1996 Cannondale M500, 1984 Mercian, 1982 AD SuperLeicht, 1985 Massi (model unknown), 1988 Daccordi Griffe , 1989 Fauxsin MTB, 1981 Ciocc Mockba, 1992 Bianchi Giro, 1977 Colnago Super
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12-14-23, 08:10 AM
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Also some bike-boom entry-level racers from France, like my c72 Gitane Interclub.
I'll let you discern the "quality" level.
.
I'll let you discern the "quality" level.
.
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72 Frejus (for sale), Holdsworth Record (for sale), special CNC & Gitane Interclub / 74 Italvega NR (for sale) / c80 French / 82 Raleigh Intl MkII f&f (for sale)/ 83 Trek 620 (for sale)/ 84 Bruce Gordon Chinook (for sale)/ 85 Ron Cooper / 87 Centurion IM MV (for sale) / 03 Casati Dardo / 08 BF IRO / 09 Dogma FPX / 09 Giant TCX0 / 10 Vassago Fisticuff
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12-14-23, 08:37 AM
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there were both french & italian base model road machines which employed a size of 25.0mm but that does not really answer your question since you are asking about quality
will be interesting to follow along...
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there were both french & italian base model road machines which employed a size of 25.0mm but that does not really answer your question since you are asking about quality
will be interesting to follow along...
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12-14-23, 08:47 AM
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Majority of bikes made in the USSR use a 25mm seatpost. HVZ Start Shosse road bike and its track/older versions also use a 25mm seatpost. Even the early high end soviet stuff used 25mm unless they used imported tubing, eventually they moved to 26.2mm.
12-14-23, 09:20 AM
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Bikes that used Columbus MS tubing, like Basso Ascot, Tommasini Diamante etc. had 25.0 posts.
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12-14-23, 10:14 AM
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1988 Centurion Ironman Carbon and 1989 Centurion Carbon-R.
(FWIW, on the subject of bike-boom French bikes, my 1980 Peugeot UO-8 internally brazed Carbolite 103 has a 24.0 seat post.)
(FWIW, on the subject of bike-boom French bikes, my 1980 Peugeot UO-8 internally brazed Carbolite 103 has a 24.0 seat post.)
Last edited by madpogue; 12-14-23 at 11:10 AM.
12-14-23, 10:18 AM
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my Vitus 979 has a 25.0 seat post
and the Zeus might, but unable to measure as its 3000 miles away in Oregon. Don
and the Zeus might, but unable to measure as its 3000 miles away in Oregon. Don
Last edited by ollo_ollo; 12-14-23 at 10:27 AM. Reason: add another pic
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12-14-23, 10:29 AM
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Was Zeus perhaps a decent quantity supplier for top end Soviet era bikes? That would make sense in light of @geeteeiii report above...
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1987 Crest Cannondale, 1987 Basso Gap, 1992 Rossin Performance EL, 1990ish Van Tuyl, 1985 Trek 670, 1982 AD SLE, 2003 Pinarello Surprise, 1990ish MBK Atlantique, 1987 Peugeot Competition, 1987 Nishiki Tri-A, 1981 Faggin, 1996 Cannondale M500, 1984 Mercian, 1982 AD SuperLeicht, 1985 Massi (model unknown), 1988 Daccordi Griffe , 1989 Fauxsin MTB, 1981 Ciocc Mockba, 1992 Bianchi Giro, 1977 Colnago Super
1987 Crest Cannondale, 1987 Basso Gap, 1992 Rossin Performance EL, 1990ish Van Tuyl, 1985 Trek 670, 1982 AD SLE, 2003 Pinarello Surprise, 1990ish MBK Atlantique, 1987 Peugeot Competition, 1987 Nishiki Tri-A, 1981 Faggin, 1996 Cannondale M500, 1984 Mercian, 1982 AD SuperLeicht, 1985 Massi (model unknown), 1988 Daccordi Griffe , 1989 Fauxsin MTB, 1981 Ciocc Mockba, 1992 Bianchi Giro, 1977 Colnago Super
12-14-23, 10:56 AM
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Was Zeus perhaps a decent quantity supplier for top end Soviet era bikes? That would make sense in light of @geeteeiii report above...
12-14-23, 11:01 AM
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My 93' Miyata Team Titanium uses 25.
12-15-23, 10:26 AM
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12-15-23, 12:32 PM
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Since 1972 Alan, Vitus, TVT, Stronglight Altec, Look. All mostly quality frames.
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12-15-23, 02:02 PM
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Late 80’s Jamis earth cruisers had that SP diameter. Some other would be General cruisers.
12-15-23, 02:47 PM
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this aluminum-framed 3Rensho pursuit bike I restored, made for 3Rensho by Yamakuni, uses a 25mm seatpost:
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12-15-23, 04:41 PM
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One of my Favorits from Czechoslovakia, a lower quality mass-production model with straight gauge tubing uses a 25mm post. The other, a high end "F1 Special" model uses a 26.4 post, built by hand from imported tubing (probably 531).
Last edited by ZenNMotion; 12-15-23 at 04:45 PM.
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12-15-23, 09:39 PM
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Incidentally I have been working on resurrecting a couple of damaged frames with 25mm seat posts
One is a black ALAN Record which has had a hard life . Came to me with a cracked and welded seatpost clamp ear.
I have a stash of ATAX quill seat posts and got a buddy to turn one down to 25mm for me .
The finish is really clean and tidy (machined one is top one in pic)
I have a Vitus somewhere in the cave too in a similar state .
All good fun !
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12-16-23, 07:58 AM
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Some early constructeur frames - Herse in particular - used 25.0 seatposts. The tubes came in whatever inner diameter they came in, and then the constructeur would braze in a sleeve to bring it to 25.0. I once did a sleeving operation like this to save a friend's Gunnar with a bunch of cracks in the seat cluster from a bungled removal of a stuck seatpost, but I think I sleeved it to 26.4 because of the greater availability of quality seatposts.
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12-16-23, 08:27 AM
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12-16-23, 03:41 PM
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