محرك سفلي بدون خيوط

Two seasons of gritty gravel riding and the dual-row bearings still spin smooth with zero creak. The center tube keeps water out of the shell, which I didn't think would matter until my last BB seized after a rainy spring.

The dual-row bearings actually fit my BB92 shell without any creaking, which I didn't expect from a press fit. The center tube seals things up nicely too, so no grit gets in on wet rides.

Pressed this into my BB92 frame and the dual-row bearings spin noticeably smoother than the stock setup. The center tube makes it feel properly sealed against grit, and after a few muddy rides it's still running quiet.