These are Timken bearings, good ones of course! Lubricate them properly, keep them dirt-free during installation, adjust them with a subtle touch, and you'll never have to look at them again! The best costs a little more, but it's worth it! Disclaimer - I have never worked for Timken, but I have used their bearings for decades and have never seen them fail (unless they've been ridden). Fat, but that's another story!)