originalshinkicker
rBotM Winner
This is the earliest 753 SBDU SB numbered track frame I have seen. SB632 dates to the Easter period of 1976, only a few months after 753 was introduced. It is built for lightness and track pursuits rather than the normal super strong and stiff 531 SBDU track machines.
I bought this frame from a family living near Morley in Leeds who were given this frame by Denise Burton, Beryl Burton's daughter - the frame was owned by Beryl. The person I bought this from was friends with Beryl and raced against her, getting mentions in Beryl's autobiography.
At some point in it's life it has had a rather crude gear hanger fitted to the rear track ends which I assume was fitted so that they could extend the usefulness of the frame and use it on the road with a gear as well as track.
It shares the same features of an early SBDU 753 road frame, Metric 753 tubing, RGF BB with 4 slots, window cut head lugs and flat (not oversized) seat stay caps.
The rear ends are drilled in the SBDU style but the drive side has had a gear hanger attached.
You'll also notice that the rear ends have had extra metal added to widen the ends - the normal Campag 1053 ends are much thicker, and I think the SBDU cut these ends themselves to save weight. I'm guessing the extra metal has been added to widen the ends and allow a QR wheel to be used without having to trim the QR axle ends.
As you can see in this image, the ends on SB632 are much thinner than a std SBDU 531 track frame with 1053 ends
The forks are also very different to 531 SBDU track forks. 531 forks typically used a Fischer crown with round blades but these forks have std oval blades and std road drilled ends. The fork crown is a mystery at the moment, it's not like any other I've seen on SBDU and is different to the std type they were using on 753 road frames, but the rest of the fork, blade stiffeners, blade ends and drilled ends are the same. As with the frame, the forks are built for lightness and pursuits - they are a little over 600 grams.
Frame has 74.4 degree seat and head angles and a 33mm fork rake
I've got a couple of posts written on my blog about it...
the first about the frame details and the modifications http://wp.me/p2bi1s-1xS
and the second and the frame geometry http://wp.me/p2bi1s-1Ar
I'm going to remove the modifications to the rear ends and get it back to how it was when it left Ilkeston 41 years ago.
I bought this frame from a family living near Morley in Leeds who were given this frame by Denise Burton, Beryl Burton's daughter - the frame was owned by Beryl. The person I bought this from was friends with Beryl and raced against her, getting mentions in Beryl's autobiography.
At some point in it's life it has had a rather crude gear hanger fitted to the rear track ends which I assume was fitted so that they could extend the usefulness of the frame and use it on the road with a gear as well as track.
It shares the same features of an early SBDU 753 road frame, Metric 753 tubing, RGF BB with 4 slots, window cut head lugs and flat (not oversized) seat stay caps.
The rear ends are drilled in the SBDU style but the drive side has had a gear hanger attached.
You'll also notice that the rear ends have had extra metal added to widen the ends - the normal Campag 1053 ends are much thicker, and I think the SBDU cut these ends themselves to save weight. I'm guessing the extra metal has been added to widen the ends and allow a QR wheel to be used without having to trim the QR axle ends.
As you can see in this image, the ends on SB632 are much thinner than a std SBDU 531 track frame with 1053 ends
The forks are also very different to 531 SBDU track forks. 531 forks typically used a Fischer crown with round blades but these forks have std oval blades and std road drilled ends. The fork crown is a mystery at the moment, it's not like any other I've seen on SBDU and is different to the std type they were using on 753 road frames, but the rest of the fork, blade stiffeners, blade ends and drilled ends are the same. As with the frame, the forks are built for lightness and pursuits - they are a little over 600 grams.
Frame has 74.4 degree seat and head angles and a 33mm fork rake
I've got a couple of posts written on my blog about it...
the first about the frame details and the modifications http://wp.me/p2bi1s-1xS
and the second and the frame geometry http://wp.me/p2bi1s-1Ar
I'm going to remove the modifications to the rear ends and get it back to how it was when it left Ilkeston 41 years ago.
Attachments
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SB632 1976 SBDU Ilkeston 753 Track Frame.jpg99.3 KB · Views: 1,164
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SB632 1976 SBDU Ilkeston 753 Track Frame Number.jpg46.7 KB · Views: 1,163
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SB632 1976 SBDU Ilkeston 753 Track Frame Lugs and Seat Stay Caps.jpg43.2 KB · Views: 1,164
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SB632 1976 SBDU Ilkeston 753 Track Ends Non-Drive Side.jpg84.1 KB · Views: 1,164
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SB632 1976 SBDU Ilkeston 753 Track Ends Modified.jpg78.3 KB · Views: 1,163
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SB632 1976 SBDU Ilkeston 753 Track Ends Different Thickness.jpg91.8 KB · Views: 1,165
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SB632 1976 SBDU Ilkeston 753 Track Fork Crown Detail.jpg69 KB · Views: 1,164
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SB632 1976 SBDU Ilkeston 753 Track Fork Details.jpg63.2 KB · Views: 1,164