what kind of frames are 26.4
07-20-13, 09:11 AM
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what kind of frames are 26.4
recently i got a 26.4 post. I was just wondering what type of bikes requires a size like this as they are unfamiliar to me.
I know the 25.0 are alan's and vitus's. 27.2 is pretty common and 26.8. 26.4 just seems odd.
I know the 25.0 are alan's and vitus's. 27.2 is pretty common and 26.8. 26.4 just seems odd.
07-20-13, 09:19 AM
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My 1972 Super Course was 26.4
My Super Mondia. Is 26.8
My Super Mondia. Is 26.8
07-20-13, 09:22 AM
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My Team Champion takes a 26.4. But my Le Champion came with a 26.6.
Both 531 DB.
Both 531 DB.
Last edited by rootboy; 07-20-13 at 04:42 PM.
07-20-13, 09:29 AM
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mapleleafs-13 - My Bertin C 37 with DB Reynolds 531 takes a 26.4 post. Typically, that size fits metric/French sized tubing from various manufacturers.
07-20-13, 09:34 AM
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I have two Lejeune frames that take 26.4. One I know is 531, the other I can only suspect is 531.
07-20-13, 09:44 AM
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My 84 Peugeot PSV has a 26.4mm diameter setapost.... So, I guess most steel Vitus steel tubed frames are the same ID at the seatpost.
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07-20-13, 10:12 AM
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My '70 Mercier as well.... Which should be metric 531....
07-20-13, 10:21 AM
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26.8 for my Viscount. Lambert/Viscount always went their own way. Made a lot of their own hardware and accessories.
07-20-13, 10:30 AM
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French framed with butted 531. English frames with straight gauge 531. English frames with good quality hi-ten tubing. No doubt others as well.
07-20-13, 11:14 AM
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My Huffy beach cruiser takes a 26.4 post. I think most of the old balloon tire bikes took a 26.4 seat post.
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07-20-13, 11:20 AM
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Seatpost diameter is nearly always the inside diameter of the seat tube minus 0.2mm for tolerances in tube manufacturing and seat cluster warpage due to heat from brazing.
The inside diameter of the seat tube is determined by two parameters: its outside diameter and its wall thickness.
So, a 26.4mm diameter seatpost could be for an Imperial seat tube (28.6mm O.D.) with 1.0mm wall thickness (28.6 - 2.0 = 26.6 - 0.2 tolerance = 26.4), or a metric seat tube (28.0mm O.D.) with 0.7mm wall thickness (28.0 - 1.4 = 26.6 - 0.2 tolerance = 26.4).
Imperial seat tubes with 1.0mm walls are usually hi-ten, and metric seat tubes with 0.7mm walls are usually chromoly or manganese-molybdenum.
The inside diameter of the seat tube is determined by two parameters: its outside diameter and its wall thickness.
So, a 26.4mm diameter seatpost could be for an Imperial seat tube (28.6mm O.D.) with 1.0mm wall thickness (28.6 - 2.0 = 26.6 - 0.2 tolerance = 26.4), or a metric seat tube (28.0mm O.D.) with 0.7mm wall thickness (28.0 - 1.4 = 26.6 - 0.2 tolerance = 26.4).
Imperial seat tubes with 1.0mm walls are usually hi-ten, and metric seat tubes with 0.7mm walls are usually chromoly or manganese-molybdenum.
07-20-13, 03:45 PM
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My Atala "Grand Prix" took a 26.4mm post.
07-20-13, 04:14 PM
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Miyata/Univega double butted is 28.6 outside, with a 0.9mm wall thickness, so that makes for a 26.8 seatpost.
07-20-13, 04:30 PM
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Back in the 70's 26.4 was typical top end French. 26.6 was for the thin walled Metric tubing, like Super Vitus.
Interestingly, I have a Motobecane Grand Jubile that takes a 26.6... not a top tier machine, original paint and paint is visible in the tube...
Maybe they just picked up a thinner walled tube for that one or batch...
Interestingly, I have a Motobecane Grand Jubile that takes a 26.6... not a top tier machine, original paint and paint is visible in the tube...
Maybe they just picked up a thinner walled tube for that one or batch...
07-20-13, 07:00 PM
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1984ish mangalloy Norco Triathlon 26.4mm.
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07-20-13, 11:48 PM
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My '84 Panasonic CB-620 has a Tange CroMo tubeset and takes a 26.4 seatpost.
Or, rather, it did: at the moment it's with one of our local builders, being reamed out to 26.8 (among other modifications). My reason for doing that is that almost no one makes a decent 26.4 seatpost these days; you're pretty much limited to budget models or paying $$$ for a nice older one on the vintage market; however, there are still some very good new seatposts made in 26.8.
In case you're curious, the CB-620 has touring geometry, but was specifically designed as a commuter (it lacks the extra bosses & braze-ons of a true touring bike).
Or, rather, it did: at the moment it's with one of our local builders, being reamed out to 26.8 (among other modifications). My reason for doing that is that almost no one makes a decent 26.4 seatpost these days; you're pretty much limited to budget models or paying $$$ for a nice older one on the vintage market; however, there are still some very good new seatposts made in 26.8.
In case you're curious, the CB-620 has touring geometry, but was specifically designed as a commuter (it lacks the extra bosses & braze-ons of a true touring bike).
Last edited by DIMcyclist; 07-21-13 at 12:27 AM.
07-21-13, 12:24 AM
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the reason i asked was because i got ahold of a Campy 26.4 aero chorus seat post and put it up for sale and i had 2 people inquire about it immediately, it was odd because i was like man, who's gonna need that odd size. turns out it's more useful than you think.
07-21-13, 05:15 AM
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1966 Camille Dardenne, made of Vitus butted steel. Also 1935 Claud Butler Super Velo, made of Reynolds HM (High Manganese - the fore runner of 531). These are the only two frames in my current fleet of 40 plus bikes that take this size seat post.