Oops my mistake.
If you have to use the stock gears like the 104 and 93 spurs then start with a rollout of 45.
Temp the motor every 3 or 4 minutes to check it.
Never let the motor go about 70 degrees celcius as it tend to fade a bit and you loose a bit of brake and torq.
If it stays cold work your way up to rollout of 50(keep checking the temp)
We drive with a 23T brushed motor the same rollout on most tracks as starters and work our way from there.
If the motor is to powerfull out of the corners, give it a bit more mechanical timing so the rev's goes up and the torque a bit down.
This give you a bit more top speed but it drives better out of the corners.
Rubber on carpet i haven't got a clue with F1 as we drive foam.
It all depends if you have to use the Tamiya rubber or not.
regards Roy