There is 2 square taper standard:
-ISO (njs stuff, campagnolo..) -JIS (most shimano stuff etc)
If your ride heavily an ISO crank on a JIS bottom for years, it's normal that it fail. The square isn't exactly the same, and don't allow the crankarms to go on correctly..
https://sheldonbrown.com/bbtaper.html
Using SG75 BB & Campagnolo BB combinated with SG75 since years without issues
Maybe newest BB are stiffer, but GXP bb aren't revognized for their longevity
Afaik Sheldon's musings on jis/iso have been debunked.
The taper is exactly the same, one has a chamfer at the end of the axle which accounts for the difference in axle length and chainline etc.
Tldr, you can use ISO cranks on jis bottom brackets and vice versa and the world will not implode.
@M_V started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
M_V
There is 2 square taper standard:
-ISO (njs stuff, campagnolo..)
-JIS (most shimano stuff etc)
If your ride heavily an ISO crank on a JIS bottom for years, it's normal that it fail. The square isn't exactly the same, and don't allow the crankarms to go on correctly..
https://sheldonbrown.com/bbtaper.html
Using SG75 BB & Campagnolo BB combinated with SG75 since years without issues
Maybe newest BB are stiffer, but GXP bb aren't revognized for their longevity