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PostPosted: Mon Jun 11, 2018 4:02 pm 
Old School Hero

Joined: Wed Jun 03, 2015 1:43 pm
Posts: 213
I have a 1" Syncros quill stem that I want to fit to a 1-1/4" fork.

Would this be too much for a shim?

Cheers

Wayne.

P.S Maybe looking to swap a 1" Syncros quill stem for a 1-1/4" :D


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 Post subject: Re:
PostPosted: Tue Jun 12, 2018 11:03 pm 
Retro Guru

Joined: Wed Aug 24, 2011 9:31 pm
Posts: 983
Location: somewhere in time
I don't think this will work and therefore I don't think these shims were available bitd.
Best is to find a nice 1.1/4 Syncros, Controltech or Answer A-TAC.
Good luck.


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 Post subject: Re:
PostPosted: Wed Jun 13, 2018 9:14 am 
Old School Hero

Joined: Wed Jun 03, 2015 1:43 pm
Posts: 213
Remko wrote:
I don't think this will work and therefore I don't think these shims were available


Cheers, that'll be why I can't find one then.


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 Post subject: Re:
PostPosted: Wed Jun 13, 2018 10:01 am 
Gold Trader
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Joined: Tue Apr 13, 2010 4:08 pm
Posts: 844
Location: Sarf Coast. Strong Island.
Didn’t Chris King used to do the ‘Devolution’ headset for just such a problem? I am open to be corrected.


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 Post subject: Re:
PostPosted: Wed Jun 13, 2018 10:05 am 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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Joined: Fri Feb 06, 2009 11:13 pm
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Location: Skipton
I’ve had a 1 1/4 to 1 1/8th in the past so imagine it’s possible. Might look a bit odd though.

I have a spare 1 1/8th quill Syncros if you end up needing one.


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 Post subject: Re:
PostPosted: Wed Jun 13, 2018 11:09 am 
Old School Hero

Joined: Wed Jun 03, 2015 1:43 pm
Posts: 213
Didn't think of looking for a 1-1/8" stem and 1-1/4" to 1-1/8" shim, food for thought.


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PostPosted: Wed Jun 13, 2018 1:49 pm 
retrobike rider
retrobike rider
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Joined: Tue Jan 29, 2008 11:04 pm
Posts: 2210
Location: A wretched hive of scum and villainy...
To go from 1/4 to 1" you'd need some 1 1/8" x 0.125" wall tube, giving a 7/8" (22.2mm) internal diameter.
Sadly that's very much a US spec. not easily available in the UK in small lengths...12ft+ no problem.

UK imperial tube is easy to get, but generally has crap SWG wall thicknesses that do not give useful internal bores.
Nearest you'll get in UK is 1 1/8" x 10SWG, which has a 22.0mm bore, so will need boring out by 0.2mm to fit your stem, then slitting.

Also, you'd need a lot of torque on the bolt to exert enough expanding force to flex a shim that thick and also grip the extra friction surfaces involved.

I have tube suitable to make a 1 1/8" to 1 1/4" quill stem steerer shim (28.6 OD, 25.4ID) if needed, few quid + post, probably.
Most of the commercially available ones around these days are made short (30-35mm) to fit inside ahead stems, and would not be long enough to support a quill stem, where you'd need around 80mm of engagement. More like a seatpost shim length is needed.

All the best,


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PostPosted: Wed Jun 13, 2018 6:06 pm 
retrobike rider
retrobike rider
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Joined: Tue Jan 29, 2008 11:04 pm
Posts: 2210
Location: A wretched hive of scum and villainy...
There you go...28.6 to 25.4mm shim in the post tomorrow :) :

Attachment:
IMAG3275.jpg
IMAG3275.jpg [ 90.36 KiB | Viewed 233 times ]


All the best,


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PostPosted: Wed Jun 13, 2018 8:30 pm 
Old School Hero

Joined: Wed Jun 03, 2015 1:43 pm
Posts: 213
:D Cheers


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PostPosted: Tue Jun 19, 2018 9:50 am 
Old School Hero

Joined: Wed Jun 03, 2015 1:43 pm
Posts: 213
Shim fitted and stem installed. Do you think it needs a rubber o-ring seal to stop any water getting in?

It seems a tighter fit with the correct size stem installed.

Cheers


Attachments:
syncros.jpg
syncros.jpg [ 164.12 KiB | Viewed 124 times ]
syncros1.jpg
syncros1.jpg [ 139.78 KiB | Viewed 124 times ]
stem.jpg
stem.jpg [ 148.98 KiB | Viewed 124 times ]
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