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@Aroogah
@M_V - I thought on my initial inspection that this was akin to the Blackburn type of cranks but the chainring may be swaged after all. I couldn't get a decent pic from the back but the chain ring is pressed onto the crank.
It's a 40T chainring which makes it an utter pain to try and find a replacement. 165mm cranks that will fit available 40T chainrings are not easy to find. My options are better with a 42T chainring instead.
I've done some quick calcs and I'm pretty sure that I can squeeze a 42T on there without them striking the mounts for the chain protector. I have about 10mm to work with and the bigger chain ring only adds about 4mm to the radius so I think I'm good.
I've ordered the Big Apples in the 50-406 size so with the 42T chainring and the 16T freewheel on the back I'll have approx 52GIs which is pretty sensible. I can go up or down on the rear freewheel if I am wrong.
A bunch of parts are arriving over the next couple of days so I should be able to start the build this weekend. The crankset remains the biggest challenge. I may decide to replace it at a later date.
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