Engine torque to wheel torque and tractive force via gearing and tyre size.
Crank torque in Nm at the RPM of interest.
Selected gear ratio, final drive and tyre rolling radius.
Wheel torque and the forward force (tractive effort) at the contact patch.
Wheel torque = engine torque x gear ratio x final drive x drivetrain efficiency. Tractive force is then wheel torque divided by the tyre rolling radius.
Low gears have a high numerical ratio, so they multiply engine torque the most at the wheels - which is why first gear pulls hardest and top gear is for efficiency.
The forward push at the tyre contact patch in newtons. It is what actually accelerates the car, and it falls as you go up through the gears.
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