To minimize breakaway friction, an O-Ring groove must be wide enough to allow rolling or twisting of the seal. In the long stroke of a reciprocating seal application, this twisting action can strain and eventually tear the rubber, causing a failure mode known as spiral twist.

Wheel HubAssembly Kit

I have a 2010 toyota corolla. Car makes a humming sound and I believe its the wheel bearing that is the issue. The cost to replace either is roughly equivalent, though from a DIY perspective replacing the assembly seems easier for me to do without having to press the bearing out (I dont have those tools and would have to bring it to a shop). From reading online, some opinions is that aftermarket knuckles may not be reliable. I'm curious what the community's opinion is about whether I should just replace the bearing or the entire knuckle hub assembly. One mechanic referred me to something like this: https://www.amazon.com/gp/product/B093SMH23P/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&th=1

Wheel Bearing HubAssembly Front

Because less squeeze means less friction with the four-lobe design, seals last longer. Therefore, equipment in which the Quad-Ring® Brand seal is installed will operate longer and require less maintenance.

Unlike O-Rings, where parting lines are on the sealing surface, Quad-Ring® Brand seals’ parting lines lie between the lobes, away from the sealing surface. This design eliminates the problems of leakage resulting from a parting line’s irregular surface.

EDIT: Thanks for all the replies! I'm still learning, but it seems like replacing the knuckle is an easier home DIY for me without having to purchase all the tools to remove the bearing since it is pressed in. It seems the concern is about quality of the knuckle replacement, since some are sub $100 and unclear what the quality is. If I did it all myself it would cost me roughly $250 for the part and a few extra tools, and would be a good experience to gain since I haven't worked on suspension parts before. Appreciate continued input

To prevent spiral twist, the Quad-Ring® Brand seal’s four-lobed configuration is designed to withstand the distortion and extrusion often caused by high or pulsating pressure. To accommodate these forces, a Quad-Ring® Brand seal uses a narrower groove than a comparable O-Ring seal.