still baffles me why people say 26″ wheels are dying, i know 1 person who owns a 29er and hes a hair under 6’10” tall, everyone i know who has recently bought a bike has bought a 26er and a few people i know who are soon to buy new bikes are not interested in 29ers at all.
as for 650b I’ve never seen a wheel in the flesh never mind a full bike, i’m not sure they even exist outside of the MTBR website.