Depends what sort of country you want to take it and how far and how much you want to pedal. If you are just going where a quad would go, you should be all good with a 500w. One thing with the bafang kits is that the front chain ring ends up further outside the bottom bracket then when it is just a standard bike, so you end up with a fair bit of cross angle in the chain when you go to the larger rear sprockets for more torque. Most of the time that is fine at higher speeds because you don't want to be pedaling really fast anyway, and on the flat you don't feel the need for extra torque when the motor achieves that for you.
You can get an aftermarket dished in ring and if you get a low tooth count aftermarket ring this helps.
If you want to go in steeper stuff, it might stall a bit here and there if you have a load on, and old mate with the knees may have to hop off and push. I will get a photo up when I get a chance to take one, hopefully later tonight.
Bookmarks