Over time hub standards have changed. Here is an indepth overview of current standards, and why/how hub sizes changed.
Full-Suspension - Rock City Cycles
Standard, Boost And Super Boost? What's The Difference? - NOBL Wheels
Reynolds Blacklabel 329 Trail Pro Wheels
The Best Carbon Wheels Under $1,300 - BikeMag
Wide Gravel Wheels (and the Lack Thereof)
Industry Nine Expands S-Series Wheel Range - Pinkbike
Guide: The Best Carbon Mountain Bike Wheels - BikeMag
NOBL Wheels ExpertVoice
DT Swiss R 470 Wheelsets - Weight, Review, Specs, Price
Super Boost Axle Spacing: What is it Good For? - Singletracks
Free Chain Stay - Orbea Rise M20 - Size Large Frame
Free Chain Stay - Orbea Rise M20 - Size Large Frame
Super Boost Axle Spacing: What is it Good For? - Singletracks