Originally Posted by smashndash

Incredible. How did BBInfinite manage to fit a sleeve around a 42mm bearing in a 42mm shell? My only guess is that they’re using nonstandard bearings, or have modified the standard 6806 30 x 42 x 7 bearings. Maybe there’s some gap in my understanding of bottom brackets, but it’s quite telling that Hambini doesn’t have any BB30 sleeves. Only a “bearing kit”.

I would ask BBInfinite what dark magic they employed to achieve this.

EDIT: After 10 seconds of googling: “They took a standard BB30 6806 bearing, which has a 42mm outside diameter, and reengineered the outer race to have a 40.5mm OD, which lets it fit inside their sleeve. That lets them bring their creak-free, perfectly aligned design to a frame design that’s plagued with reliability and tolerance issues. But it keeps the 30mm inside diameter, so you can still run your BB30 cranks.” And this is why BB30 is a mess.

Pick your poison I suppose. Understand that the bearings are probably significantly compromised after you machine away 1.5mm of hardened steel and press it into aluminum. The biggest effect is usually the bearing’s inability to resist deformation in the press-fit housing, thus crushing the balls in the bearing. Also, replacement bearings will be a pain to find - BBInfinite has you by the jewels.

Edit again: I’d recommend going with some quality, fully sealed bearings like these: https://www.hambini.com/bearings/ful...e-bearing.html