Let me guess - chainring swaged to the crank (no spider), gas-pipe tubing to retain stiffness despite the crimps, not strictly speaking street-legal clearance between tyre and tube? There are ways and means, but as I said, if you want proper clearance and the ability to use any track chainset, you're too short of space.
Not quite, the chainset is the previously mentioned Andel, but gaspipe is correct. The stays are pretty long as the bike was originally built for 630mm wheels and I’m running 622.
Let me guess - chainring swaged to the crank (no spider), gas-pipe tubing to retain stiffness despite the crimps, not strictly speaking street-legal clearance between tyre and tube? There are ways and means, but as I said, if you want proper clearance and the ability to use any track chainset, you're too short of space.