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I've got threaded bb on my current road bike with 30mm spindle. It's the only road BB I've ever worn out and I did it in a year. Campag, shimano, done thousands of kms with threaded external BBs on 24/25mm axles no issues.
Sample size of one pretty much makes my experiences meaningless but will see how long the second BB lasts.
As for mtb - never found Sram BBs great even on threaded 24mm stuff and never used a 30mm/threaded bb combo but I'd rather stick to shimano.
number21
You’d best let Shimano and Sram know they’ve got it wrong.
It’s no coincidence that the Sram Dub downsized layout coincided with a resurgence in popularity of threaded bb shells.