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Fuji S10-S - does anyone know the seatpost size?

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Fuji S10-S - does anyone know the seatpost size?

Old 10-23-11, 07:18 PM
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Zumkopf
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Fuji S10-S - does anyone know the seatpost size?

I want to replace the steel seatpost in a 1977 Fuji S10-S (first year of the 12-speed, I think) with an alloy one. I don't have a micrometer. Does anyone know the seatpost size? Sheldon Brown's database doesn't list it, nor does the 1977 Fuji catalog have that data. Thanks, Z
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Old 10-24-11, 12:40 AM
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pull out the seatpost, and put a ruler or tape measurer to the diameter of the seat tube.
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Old 10-24-11, 06:12 AM
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26.6 mm .. at leasts for the earlier years. It might have moved up to 26.8 but I don't think so.

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Old 10-15-13, 04:30 PM
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I would like to revive this thread to answer the original question: what is the seatpost diameter for the 1977 fuji s10s? I recently bought one to get into biking due to a knee injury (and also to learn about bikes). I bought a 25" inch frame, but I am 6'6" with long legs and I need to move the saddle even further back than the rails will allow. So I need a setback seatpost. I took the bike the LBS to have the seatpost measured and they guy there told me the post was 25.8mm, but that doesn't seem right to me--just using a measuring tape, it seems to be in excess of 26mm.

If someone here can help I would appreciate it very much!
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Old 10-15-13, 09:35 PM
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Originally Posted by longfemurs View Post
I would like to revive this thread to answer the original question: what is the seatpost diameter for the 1977 fuji s10s? I recently bought one to get into biking due to a knee injury (and also to learn about bikes). I bought a 25" inch frame, but I am 6'6" with long legs and I need to move the saddle even further back than the rails will allow. So I need a setback seatpost. I took the bike the LBS to have the seatpost measured and they guy there told me the post was 25.8mm, but that doesn't seem right to me--just using a measuring tape, it seems to be in excess of 26mm.

If someone here can help I would appreciate it very much!
Alas, the catalog doesn't shed any light on it: https://www.classicfuji.com/1977_15_S...ions2_Page.htm
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Old 10-15-13, 09:48 PM
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The hardware store down the block from me has basic calipers for less than $3. I'm not don't know if thats available to you, but its easy way to be sure.
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Old 10-16-13, 06:30 AM
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I'll check in with my Google Fuji group .. I'd still bet 26.6 or 26.8. My late '70's Royale is a 25.8 so it is possible ..

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Old 10-16-13, 11:25 AM
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Originally Posted by Zumkopf View Post
I want to replace the steel seatpost in a 1977 Fuji S10-S (first year of the 12-speed, I think) with an alloy one. I don't have a micrometer. Does anyone know the seatpost size? Sheldon Brown's database doesn't list it, nor does the 1977 Fuji catalog have that data. Thanks, Z
I'd bank on 26.0
https://www.ebay.com/itm/Vintage-Fuji...item2583b90176
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Old 10-16-13, 12:19 PM
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On the other hand, this parts catalog shows that the 1974 seatposts were 26.6....

https://vintagefuji.posthaven.com/fuji-parts-catalog
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Old 10-16-13, 12:20 PM
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I take that back...I guess that catalog item is referring to the Newest and Finest models. The seatpost diameter for the s10s isn't stated.
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Old 10-17-13, 06:33 AM
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This turns out to be a not so simple question .. but a steel seat post would have been 26.2



I forgot I had these pages on my website:

https://vintagefuji.posthaven.com/?page=4

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Old 10-17-13, 07:16 AM
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Thank you for your time and assistance Scott. I think you' must be right--I measured the length of my seatpost and it looks to be 165mm, which would make 26.2 the only option according to the manual page you posted. How were you able to tell, though, that the post wouldn't be one of the 25.8/230mm long steel posts?

Thanks again, much appreciated.
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Old 10-17-13, 07:30 AM
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Originally Posted by longfemurs View Post
Thank you for your time and assistance Scott. I think you' must be right--I measured the length of my seatpost and it looks to be 165mm, which would make 26.2 the only option according to the manual page you posted. How were you able to tell, though, that the post wouldn't be one of the 25.8/230mm long steel posts?

Thanks again, much appreciated.
First two rules on old bikes.

1. Never assume parts are original. POs have had 35 years to change stuff.

2. Never assume parts on a bike as found are the right size.
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Old 10-17-13, 10:07 AM
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I don't have an S10-S any longer, which is a real shame. I have an early Special Road Racer, which I can measure tonight. Perhaps that will turn out to be a 25.8.

Did you LBS measure your existing seat post or the frame itself? wrk101 has a good point.

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Old 10-17-13, 11:48 AM
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Originally Posted by wrk101 View Post
1. Never assume parts are original. POs have had 35 years to change stuff.
2. Never assume parts on a bike as found are the right size.
No. 2 has bitten me more than once. If you don't have a digital caliper to measure it, bring the bike to a co-op.
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Old 10-17-13, 12:50 PM
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The LBS measured the post itself by sticking it into a seatpost measurement tool/bar.

I believe all the parts on the bike are stock based on the research I've done so far and the fact that the bike seems to have had very little use (the tires are original and have almost full tread, although the sidewalls have clearly dried and deteriorated). I think the seatpost is likely stock as well because A) it says "made in japan" in large letters, and B) it looks exactly like the post being in the ebay auction linked to above by mrmw.

So it's either 25.8 or 26.2....
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Old 10-17-13, 12:58 PM
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Originally Posted by mrmw View Post
^^ This. I have a 1977. It's 26.0 and steel. I've serviced three 1977s in the last year and a half. All the same... Phil G.
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Old 10-17-13, 04:24 PM
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Thanks Phil! I'm going to assume you know your stuff, and go ahead and order a 26.0. I'll update the post when it arrives and I try to mount it.
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Old 03-19-20, 08:20 PM
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Im meassuiring 25.6mm here on an S 10-S, plastic caliper, I should probably get a real one.. but its never been more than 1mm off before.

Putting down the calipper a different way makes 25.8mm, so im gonna go for that since that was mentioned in this thread.

Last edited by Matsbjorn; 03-19-20 at 08:31 PM.
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