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Old tandem headset

Dan Noble2018-04-20 08:03:24

I've picked up an old tandem fram of unknown origin. No serial numbers/make etd.

It seems to have an unusual head tube with integrated crown race. 

The man in my LBS was baffled.

What kind of headset/bearing and forks might be compatible here?

The outer diam is 45mm and inner is 33 of what looks like a crown race