Have you considered just switching out to bigger wheels?
Im not sure will the setup / board deliver enough power, but if you can retrofit the pulley, you might get the desired speed…
Have you tried to ‘‘play’’ with the numbers here?
If someone has 90mm to try and they are flywheel clones, the pulley might fit… looks somewhat similar.
Though when running the thing through calculator, it looks like you would better be off with 97mm wheels but then again they might not fit onto your deck nicely because of the size. Though im not super sure.
IF the motor kv thing is somewhat right and gearing too, then you might get extra 3mph.
If you do still want to ‘‘change motor’’ route, then yeh, you would be better looking at 260-290kv motors, if you dont replace the battery and controller…
**The calculation numbers does not decrease the efficiency… so okay, it might be more like 2mph in the end because of the lost torque or something… though if someone around you has the big wheels or you can get them just to test it out… I would maybe start with the wheels as that would require the least modification, I think, if the pulley fits straight to the wheels…
When I put 6’’ inch wheels (pneumatic) with the same gearing and motor I get only about 15mph, then with 9’'inch wheels, I get 22mph.
Ive got a big different in wheel size, but if you go from 83mm to 97mm, then there’s also a big improvement in speed, I think.