Hi Miljan,
That is a very good question that I still haven't written an article about. Thank you.
Short answer
For triple cranks that aren't road-cycling specific (road ones are rather rare these days), Shimano BB-UN300 Bottom Bracket - BSA 68mm - JIS Square Taper - 122.5mm (LL123) should work fine. Example (from a German store):
https://www.bike24.com/p2372409.html
For double cranks (usually road-cycling cranks and front derailleur), Shimano BB-UN300 Bottom Bracket - BSA 68mm - JIS Square Taper - 113mm should do the job. Example (again, from a German store):
https://www.bike24.com/p2372398.html
Explanation
I hope that @VlPo and @bluedovebike will correct me if I write something wrong.
As far as I can tell, you are looking for a
square taper bottom bracket, with a British threaded standard, and a 122.5 mm long axle.
Today, Shimano sells D-NL, and LL square taper bottom brackets (maybe they offer some more, but I don't know about them).
- Shimano D-NL (Dyna-Drive Narrow Line) is designed for older style bikes and road bikes with narrower chain line.
- Shimano LL (Long Line) is designed for modern mountain bikes with a wider chainline.
So, for a similar total axle (spindle) length, the LL bottom brackets should have the axle protruding further out on the right-hand-side (compared to a D-NL bottom bracket), and have it protrude less on the left-hand-side (again, compared to a D-NL bottom bracket).
The 5S and similar are old standard marks as far as I know.
For most current non-road triple cranks, a LL bottom bracket with the spindle length from 122 to 123 mm is usually good, and usually gives a ~ 50 mm
front chainline.
That usually works well with most current Shimano MTB or "Treking" triple square taper cranks.
A D-NL bottom bracket with a similar total spindle length will give you a 47 mm front chainline.
This is my
square taper axle recommendation list. For road cranks, it is best to look for D-NL, while LL bottom brackets work best for other cranks (MTB, Treking etc.).
Relja