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PostPosted: Fri Jan 31, 2020 1:41 pm 
retrobike rider
retrobike rider
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Joined: Tue Jan 29, 2008 11:04 pm
Posts: 2555
Location: A wretched hive of scum and villainy...
Ah, OK, I never noticed a sleeve on mine, just threaded.
Longing has it now...

Could turn down a 68mm long std alu or steel BB shell to diameter and bond or press in.

All the best,

 Post subject: Re:
PostPosted: Fri Jan 31, 2020 11:50 pm 

Joined: Sun Sep 30, 2018 10:14 pm
Posts: 5
Cheers, any ideas on frame numbers and dates?

IMG_20200130_190243.jpg [ 1.27 MiB | Viewed 280 times ]
IMG_20200130_190250.jpg [ 1.19 MiB | Viewed 280 times ]
PostPosted: Fri Feb 07, 2020 5:41 pm 
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Joined: Mon Oct 15, 2012 11:12 pm
Posts: 286
Location: Herts/Essex border, UK
There is a problem with magnesium interacting with steel leading to corrosion. That is why you may find aluminium sleeves about a Kirk in order to isolate steel components from the frame.
They are lovely bikes. I have a Precision which I bought in pretty much original condition. It is the base model in the catalogue with steel fork, Suntour derailleurs, Stronglight chain set and Shimano brakes. When I stripped it down, the frame, without forks, just looked like a work of art. You could have hung it on the wall with no problem and told your friends it was avant-garde art.
Not surprisingly with the amount of metal and bracing, they are really stiff and ride like on rails. Not the lightest but quite comfortable. They are not solid but hollow inside. An early use of CAD design by Kirk who worked in aerospace and at Ford. Why Magnesium ? An engineer friend of mine, also from Ford, told me it was probably because it is the lightest metal you can cast.

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