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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
hacha-
but GXP bb aren't revognized for their longevity
This is also myth. I've used the same GXP BB for nearly 4 years, 5 days a week, all weathers. Its getting slightly gritty now
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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.
PhilDAS
M_V
no I never snapped a pair. the non drive became progressively less "square". once they start loosening its a 1 way road for square taper cranks. complete crap 2/10 would never ever ever buy again