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Yeah, I get that the size is the same but it seems they use 27.5 when talking about say Enduro MTB wheels and 650B for road/gravel? Maybe that's just my initial impression looking at a couple of sites. For example the Merlin wheels are more MTB oriented hub (Axle: 15x100mm or 20x110mm). I could shim that done to work with 12mm thru axle. The rear might depend on 142mm or 135 back end. If it was a 4S I think it's 135, whereas the Tripster is 142. But I think these wheels can be changed with end caps.
It's the same size, like 700c and 29"