Ha, not light. 85kg ish rider weight.
Streets are all flat, but I intend to find some hills to climb. Maybe I can get away with dual 6365s.
I don’t feel like I’ve really stressed the 6374s on my street board, but it does get very hot in Texas. 32-40C for 6 months out of the year.
Edit:
Looks like the consensus is that dual 6355 aren’t enough for off-road
@moon how do your 6365s do offroad?
I’m trying to decide how small/light I can go for this build - 6365s or 6374s. Hoping the full build will be <30lbs, but i’m 190.
I do fine with them. I can make it up the steepest hills with 5.5/1 gearing 170kv 12s 8" tyres. Weigh about 67kg
I would get the 6374 size than.
If you find out they are too heavy for you, it’s cheaper to switch to smaller motors 
Ok it‘s the same cost the one way or the other.
I personally think it’s more likely you will want the extra torque more than some 100g extra weight will trouble you.
6374 is really a nice size for a light weight MTB.
Just stumbled on these-
They look amazing for price, discharge rating, and Ah. 184 Wh/kg is one of the higher energy densities I’ve seen, especially for the price.
I do not know this brand, but I like hard case lipos 