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Does this "MAC 5T geared hubmotor" have a manula clutch? Your wording suggests it does. I'd like to see the specs if you have a link. (Seems MAC are a brand of ebike motors?)
If you're talking about your typical gear motor with it's internal freewheel, well, then just about any gear motor would do, except for maybe the gearing being too low to get you up to the speeds you're talking about....unless it's not actually laced to the wheel itself. Of course geared motors are not usually over 500w, either.
I'd think if you're able to hit 40+ on leg power, you could get away with a small motor. 250 or 350 watts...but this is my minimalist - in cost, weight and power - fixation talking. 750w/1500w in something that aerodynamic would be fun, whereas 350w would merely "get the job done" for the least.
Have fun when you get around to electrifying it!
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