Original sentence: An exception is during positive acceleration when the engine power is driving two or fewer wheels.As such, the most powerful cars are almost never front wheel drive, as the acceleration itself causes the front wheels' traction to decrease.In this situation where all the tires are not being utilized weight transfer can be advantageous.The net loss can be attributed to the phenomenon known as tire load sensitivity.This bias to one pair of tires doing more `work' than the other pair results in a net loss of total available traction.This is why sports cars always have either rear wheel drive or all wheel drive (and in the all wheel drive case, the power tends to be biased toward the rear wheels under normal conditions).Weight transfer causes the available traction at all four wheels to vary as the car brakes, accelerates, or turns