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PostPosted: Wed Jul 03, 2013 3:15 pm 
BoTY & PoTM Winner
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Location: KEEPING THEM SAFE FROM HARM, ANYWAY I CAN....!
late 80s and 90s Overburys..... 8)


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PostPosted: Tue Jul 09, 2013 2:18 pm 
BoTM | Gold | PoTM
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Can anyone tell me the seatpost size? To clarify it's for an 88/89 u-brake model in case they changed size at any point.


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PostPosted: Tue Jul 09, 2013 3:08 pm 
retrobike rider
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Location: A wretched hive of scum and villainy...
It'll be 27.2mm...My '88 Pioneer was.
Some of the earlier FellRider and Peakfinders had some 501 tubing, so they might be 26.8mm.

I don't think Andy built with anything lower down the scale than 531 otherwise, and things hadn't gone oversized yet.

All the best,


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PostPosted: Tue Jul 09, 2013 3:14 pm 
BoTM | Gold | PoTM
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danson67 wrote:
It'll be 27.2mm...My '88 Pioneer was.
Some of the earlier FellRider and Peakfinders had some 501 tubing, so they might be 26.8mm.

I don't think Andy built with anything lower down the scale than 531 otherwise, and things hadn't gone oversized yet.

All the best,


Thanks for that :) I also just found this thread which says 26.8mm :? viewtopic.php?f=1&t=89004


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PostPosted: Tue Jul 09, 2013 3:31 pm 
BoTY & PoTM Winner
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Location: KEEPING THEM SAFE FROM HARM, ANYWAY I CAN....!
My black one pictured above, is 27.00. but a 90s model bike.

The yellow and blue 88/89 pictured above came with a 26.8 which sadly was the wrong size, the correct size being 27.0.

I hope this is of some help.

8)


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PostPosted: Tue Jul 09, 2013 3:40 pm 
BoTM | Gold | PoTM
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Hmmmmmm........so 26.8, 27.0 and 27.2 have all cropped up. Guess I just need to buy some verniers and see what fits :D


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PostPosted: Tue Jul 09, 2013 4:31 pm 
retrobike rider
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Location: A wretched hive of scum and villainy...
Weird, as all the late 80s Reynolds ATB seat tubes, including Magnum, are 1.0/0.7, giving a 27.2mm internal on a 28.6mm OD tube.
Image

Possible cause?:
My 86' Pioneer cracked through at the ST/TT joint where it had distorted from the fillet and had been reamed out fully to 27.2, leaving very little thickness of metal. The later frames had the reinforcing sleeve/lug at this joint, allowing the tube to be reamed properly. I think it might depend on which model of reinforcing sleeve was used. Some have the parent tube running fully through, probably running 27.2mm. Others have a straight shoulder inside about 10mm up from the bottom edge, the rest of the internal bore is from the lug not the tube, so it's the outer sleeve/lug that dictates the seatpost diameter, not the tube itself, probably 27.0 or 26.8mm.

Looking at this small selection we have between us, I also suspect Andy built the frames with whatever came to hand...or perhaps sometimes didn't ream the distortion fully out, and sometimes didn't put a sleeve on at all (the-duke's).

All the best,


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PostPosted: Tue Jul 09, 2013 8:52 pm 
BoTM | Gold | PoTM
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I don't really want to clog up this thread talking about seatposts but I guess it could be useful to others. By a process of elimination it appears to be 26.8. I have a 27.2 which doesn't come close. A 27.0 goes in but not far. A 26.6 rattles about and the post that was fitted to the bike is snug although the size is not visible.

The problem I am having is that it goes in a little way then starts to get harder ( :shock: :lol: ). Looking down the tube and it has a lot of crap and general dirt down there which is stuck to the sides and I can't remove it by hand. Any tips?


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PostPosted: Tue Jul 09, 2013 9:35 pm 
retrobike rider
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My 2 were 26.8....


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PostPosted: Tue Jul 09, 2013 10:22 pm 
Dirt Disciple

Joined: Wed Apr 10, 2013 4:52 pm
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Try a dremel or similar with a flexible shaft drive and a small wire brush?

Andy


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