Bearings are available in lots of sizes, load ratings and speed ratings.
I'd expect the alternator designer and belt drive designer(s) to have done their homework.
In the '80's when I was designing belt drives and picking bearings for equipment the OEM also tested the design to be sure I didn't miss something....
2018 L5P Sierra 4x4 SB Denali
Sold 2011 LML Sierra 4x4 CCSB SLT
Sold 2010 LMM Sierra 4x4 CCSB SLT
Sold 2004.5 LLY Sierra 4x4 ECLB SLE
Last edited by redwngr; 05-02-2019 at 12:03 AM.