I have 3 10.5T motors from different manufacturers and the KV ratings on them are 3200, 3400 and 3600KV. All this really tells you is nothing. You can use all 3 in the 10.5T class and i guess thats all that matters, however, some make more torque others more rpm, and it becomes a horses for courses sort of thing to pick a motor for the track you are running on.