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PostPosted: Wed Feb 02, 2011 5:20 pm 
Retro Guru

Joined: Tue May 11, 2010 4:13 pm
Posts: 636
Location: Scarborough
...seatpost? It looks like 26 and a bit mm, but (having misplaced every actual measuring device in the house) I thought I'd better check! The seatpost is missing so i need to get hold of a new one (or develop very strong thighs :( )

Cheers,

Luke


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PostPosted: Wed Feb 02, 2011 10:41 pm 
Retro Guru

Joined: Wed Dec 10, 2008 9:19 am
Posts: 2093
Location: Sheffield, top city
would guess at 26.4 - this was the size for plain gauge 531


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PostPosted: Thu Feb 03, 2011 12:34 am 
Retro Guru

Joined: Tue May 11, 2010 4:13 pm
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Location: Scarborough
Thanks very much- I'll take a punt on that!


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PostPosted: Thu Feb 03, 2011 12:39 am 
Old School Grand Master
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Joined: Wed Feb 20, 2008 12:21 pm
Posts: 5784
Location: Lost in Translation
I think it's unlikely to be a plain gauge seat tube on an ST tube set. My last Galaxy was 27.0mm, and I have a feeling my older Super Galaxy was 26.8mm

531ST was sold in different gauges. The only way to be sure is to measure your frame, or try a number of posts until you find the right one.


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PostPosted: Sat Feb 05, 2011 12:21 am 
Retro Guru

Joined: Tue Jun 03, 2008 4:31 pm
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I can't check as I have leant my copy of Tony Oliver's book to a mate but I think he lists sizes there. i know that many 531's take a 27.2 but should really be reamed to 27.4 as thats the true size. try and find the book maybe? or search for Reynolds tubing on the web.


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PostPosted: Sat Feb 05, 2011 12:25 am 
Retro Guru

Joined: Tue May 11, 2010 4:13 pm
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Location: Scarborough
Bugger! What kind of sadist takes out a seat post anyway? Jim, do you know what ages your Galaxy and Super Glaxy were?

Cheers,

Luke


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PostPosted: Sat Feb 05, 2011 1:26 am 
Old School Grand Master
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Joined: Wed Feb 20, 2008 12:21 pm
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Location: Lost in Translation
Goldie wrote:
Jim, do you know what ages your Galaxy and Super Glaxy were?

The Super Galaxy was a 1990 model - Post Office red with full LX. The Galaxy had been resprayed, but was mid nineties. I also built a late eighties Galaxy for a friend about ten years ago, and remember very clearly the 27.0mm Ritchey seatpost that went in snugly.

Have a look at this chart:

http://www.equusbicycle.com/bike/reynol ... -sizes.jpg

The standard 531ST set has a 0.2mm thicker seat-tube wall than 531c. That implies a 0.4mm smaller seatpost than a typical 531c frame. But again, there's often more variety to be found in real bikes than in the catalogues (or in the selection of catalogues that have found their way onto the web), and the only way to be sure is to measure, or try a few different posts. Your local bike shop might have a sizing gauge if you can't lay your hands on a Vernier caliper.


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PostPosted: Tue Feb 08, 2011 11:49 am 
Old School Hero

Joined: Fri May 08, 2009 5:17 pm
Posts: 226
Location: Edinburgh
My 97 galaxy was a loose fit at 27.0 so I reamed it out to a snug 27.2. Try 27.0 first :)


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