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27.5 is the 'fun' wheelsize typically used on trailbikes and down hill bikes. Bikes with a fair chunk of travel, 130mm or more. This frame was designed for a 100mm fork. You could fit something longer but you might snap the head tube off or get weird handling effects. Depends on how the frame was constructed and the geo used.
You could run it rigid for fireroad / gravel fun.
(although yah, everything is going 29" now)
i dont know much about geometry for this kind of bike, but would it be possible to use a "better/fun" fork? also, what is a "fun" fork?
would it be "stupid" to ride it with a rigid fork??
all of this is just for the sake of discussion, i am not gonna get this frame