Bottom bracket threading/size question (amateur hour)
I've picked up an 80s era Fuji Sports 10. My goal is to turn it into a single speed commuter, but really I'm just taking it apart slowly and trying to learn some bike mechanics along the way (you'll see from my question that I'm new to this).
I've gotten to the cranks and bottom bracket completely disassembled (why? the larger chainweel is attached to the crank and I wanted it gone, also the learning thing). The cranks were three piece cottered, I pounded the pins out easy enough and removed them, the axle and both the fixed and adjustable cups. I'm looking at and measuring the naked bottom bracket housing and I'm trying to determine exactly what I've got before I go about replacing parts (e.g. putting in a cartridge bottom bracket).
I measure 70mm across the bottom bracket (from the outer edges) and the fixed cup screws in to the left, which confuses me because the research I've done tells me I shouldn't see this combination. Am I measuring incorrectly? Surely I'm doing something stupid, but on the small chance that I'm not, can I even get a bottom bracket cartridge to put into this frame?