Have 10.5 & 2.5 redlines Sensored. Seems the 2.5 motor has exccessive play then the 10.5 motor. Also brand new in the box.
Also have have 2.5 Sensorless redline motor W R1Pro and it has noplay at all.
Don't know what the spec are. But, Sensored & sensorless run good for my standing and driving style.