Summary:
This Ashi waza (Foot / leg techniques) closely resembles the Sasae-tsurikomi-ashi (Supporting foot lift-pull throw) Waza.

Features of this Waza"
The Hiza-guruma (Knee wheel) Waza uses the Tsurite (Lifting hand) and foot in the same manner as the Sasae-tsurikomi-ashi (Supporting foot lift-pull throw) Waza, and consists of throwing the opponent in a sudden motion by rotating the hand and foot 180 degrees.

Waza details:
This Waza differs from the Sasae-tsurikomi-ashi (Supporting foot lift-pull throw) Waza in that the bottom of the attacking foot strikes the opponent just below the knee instead of at his ankle.

From the natural posture, Tori (Player executing technique) takes a big step toward Uke (Player receiving opponent's attack) so that his body is snugly against Uke (Player receiving opponent's attack), then, using that forward-stepped foot as a fulcrum, Tori (Player executing technique) then reverses his body motion, sweeping the arch of his foot against Uke (Player receiving opponent's attack) leg, striking the leg just beneath the knee.

As Tori (Player executing technique) body motion reverses, Uke (Player receiving opponent's attack) is pulled forward and his balance is destabilized.

Tori (Player executing technique) then twists his lifting and Hiki-te (Pulling hand) as if turning the steering wheel of a car, and throws Uke (Player receiving opponent's attack) down.

In actual competition, a combatant usually does not make the final selection between the Hiza-guruma (Knee wheel) and the Sasae-tsurikomi-ashi (Supporting foot lift-pull throw) Waza until the attack has already begun, but the Hiza-guruma (Knee wheel) is favored by those with long legs and arms.
Therefore, this Waza is a favorite of many combatants from Western countries.

Waza usage tip:
Attempting this throw with the hands alone will likely end in failure. One must also use the momentum from the body motion reversal, and use the leg as the fulcrum for the body rotation.
Taking a large step forward with the Support leg increases the effectiveness of the body's twisting motion.