Originally Posted by
prj71
Correct. And they will accept 27.5+ tires.
That approach in 2016-17 was based on a 27.5x3 being par for diameter with a 29x2.2. By 2018 when I bought my bike they had already backed away from 27.5x3" tires as too floppy and were accepting more pedal strike with 2.8's. Now, it's going away. Frames drawn long-low-slack around 29x2.5-2.6 have too much bb drop for 27.5x2.8 that would put the bike half an inch lower, and are using the real estate that would have been taken on the 3 in width for other purposes. I'm sure you can find counter examples, and the plus tires are going to persist longer and be more tolerable on hard tails, but that looks like the way it's headed.