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Give it ten years 26" will be back in.
The marketing guys will be like: "Yeah, the nimbleness of the original MTB wheel size means that you can turn on a pin. They accelerate faster than a 27.5 or 29er, are stronger as a result of their more compact compressive arch, are lighter, and their steeper contact angle means that jumps are easier to take.
Tight, steep downhill switchbacks are a doddle on a 26er and their decreased tyre contact patch means that drifting in turns is more easily achievable!
Why go bigger and more stable when you can have so much more fun on 559?":-D
Rear wheel is 1309g. Not bad. I built a standard 26" MTB rear wheel (Sun Ringle S-Type ETX downhill rim with a Novatex GCC hub) the other day that was heavier than that. :-D