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There is no right or wrong. I don’t think you will break a 32H wheel even if it is theoretical weaker than a 36H. But then again a 36H gives that peace of mind. Also for the small weight saving (~40g?) maybe just go for the strong option. Light wheels are nice (I have 4 unicycles 27.5" (32H), 29" (32H), G29" (36H) and 36" (36H) with carbon wheels) and feels super responsive but there are also some drawbacks in my opinion so aiming for the lightest build possible might be fun but not necessarily “better” depending on how you define “better”.
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Not sure what length/dimensions you are missing. Just use a “custom” calculator like Online Spoke Calculator for Hubmotors and Ebikes
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The bearing caps of the M4O “M” frame fits like a glove. I assume they are identical on all frame sizes. But just write/ask mad4one directly and they will know. Also have a look in the thread Schlumpf 2022 Build Questions - #135 by Hammer for a lot of nice information about building.
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