>>1486363>My biggest problem is currently the bottom bracket. I have plenty tools but no thread-measuring tool, so i can't just disassemble and measure it to order a bracket from the net.>Any idea, what should i do?For the BB shell specifically, pic related is a nice trick.
https://www.sheldonbrown.com/measure.htmlUnless it's French/Italian/Swiss made it's 95% BSA (i.e. standard) threading. Otherwise you can generally go by the bore dimensions and the direction of the threading - check the link in the screencapped section of that article.
Regarding BB choice that depends if you'll keep the crankset or not - If you keep it, sunrace makes the BBT08 which is sealed (them again, I know, it's just that they have a lot of retro-friendly parts in their catalog and don't overcharge for them like the hipster brands); if not just get decent square taper like shimano.
The crankset I leave to your discretion because of variables like budget, aesthetics, double or triple (useful with 5s), gearing, hunting on ebay for a classic part vs buying new, etc. but I would go for
https://www.planetx.co.uk/i/q/CSHOCNC/holdsworth-retro-cranksetIt's new, so no hunting or bad surprises, the price is reasonable vs the hipster brands (seriously, anywhere from 1/2 to 1/5 of the price), and it's a compact so more useful for casual riding (dunno if your FD will work smoothly but it's not as big of a deal as only triples are really picky).
But again, it's your pick, a 30€ entry level crankset will serve you just as well if you don't mind looks. The only major gotchas out there are ISO vs JIS taper profile but in modern parts it's 99% JIS taper (still worth checking) and spindle length (only that important for perfect chainline, some people fiddle with it to change Q-factor without much ill effect).
