"I've often wondered about a 7x9. Not so much as a dirt bike, but as a better hill bike for those that live in like, Colorado or Santa Fe or San Francisco.
Since a 9x7 at 48v is 27 mph, and a 6x10 at 48v is 20 mph, I'd think the 7x9 would go about 23.5 mph full throttle.
Since a 9x7 luggs down on a hill about 13 mph and a 6x10 luggs down about 5 mph, you should be able to climb hills as slow as 8-9 mph without exess heating with a 7x9. So perfect for those pesky 10% grades, and able to handle short 15%.
Sounds like the 7x9 would be perfect for a mountain dweller. Still have 23 mph at 48v, and able to climb a bit steeper than usual for a 9x7.
At some point, the shipping cost is not the issue, the issue is getting what you need. You might be able to get something exotic from the US dealer, but you'd have to wait months for the next container to arrive, or pay a lot for shipping onesey from china. Why not just buy from europe if you want it now?"
Pero no me queda claro que dicen en el tercer párrafo respecto al 6x10, 7x9 y 9x7 por algunos términos que usan y como ponen la velocidad de unos respecto a otros, me da la sensación que dicen que sube más lento un 6x10 que un 9x7.