All producers have different kv ratings for different "T" ratings. What is the Kv limit for Tekin R1 esc. tekin 5t motor is 3700kv but there is a lot of 5T motors around 5000kv, can R1 handle that motors?
The KV rating isn't what the limit is created by. The limit is created by the wind count and amount of current that would create. We could care less how fast the motor spins.
Sounds like you can use any motor that does not pull more than the amp rating of the esc... As the tekin dude said, keep a close eye on temps. You can gear any motor to draw tons of amps...
I would do nothing very extreme. I want to use a castle 7700kv motor on 2s on my 1/10 onroad car. Is it possible and if not can I use at least a 6900kv castle motor? I will try different but conservative gearing but off course don't want to gear a 7700kv motor for same top speed as a 6000kv motor.
Actually that is the main problem. Like you give nt exact kv values the producer of these motor don't give winding numbers. There is only this information on the product page for 6900kv motor if it helps :This motor is best compared to a 6T brushed motor on steroids, with none of the brushes or comms to ever wear out
For 7700kv motor they say: The 7700Kv motor is roughly equivalent in top speed to a very good 5t to 7t brushed motor on 6 cells