Koshi-guruma (hip wheel) belongs to the second group of the gokyo. Tori wraps an arm around uke's neck, slides the hips past uke's body and rolls uke over the top like a wheel. It is the most natural hip throw for long-armed players and against opponents who bend forward.
You see it a lot with kids and with heavyweights. The reasons are different, as we will see.
The arm around the neck
Among the koshi-waza in the nage-waza family, what sets koshi-guruma apart is the tsurite arm. It wraps uke's neck. In o-goshi it wraps the waist, and in tsurikomi-goshi it keeps hold of the lapel.
Controlling the head does two things. It pulls uke forward much more easily, because where the head goes, the body follows. And it lets you throw a bent-over opponent who would have blocked a standard hip throw.
Kuzushi and entry (right-handed)
Your left hand (hikite) pulls uke's right sleeve forward and up. Your right arm lets go of the lapel and wraps uke's neck over the left shoulder, with the hand behind the neck or on the right shoulder.
- Right foot in front of uke's right foot, on the inside.
- Pivot, bringing your left foot in front of uke's left foot.
- Hips low and well past uke's right side. Your right hip ends up outside uke's right hip.
- The neck arm pins uke's head against your shoulder.
- Rotate to the left and straighten your legs. Uke rolls around your hip.
The head control makes forward kuzushi easier, but you still need it. Without it, uke pulls the hips back and you end up carrying dead weight.
Why the hips have to go past uke
This is the detail that belongs to koshi-guruma. The hips travel further than in other hip throws, so uke rolls over the top instead of sliding off the side. If they stop at the middle of uke's body, you are doing a poor o-goshi with the arm in the wrong place.
A useful check: at the end of the entry, your right hip should feel the side of uke's thigh, not the stomach.
Common mistakes
- Squeezing the neck. The arm wraps and pins. It does not squeeze. A choke during a throw is dangerous and illegal.
- Keeping your head up. Turn your head to the left and follow the rotation.
- Letting go of the sleeve. Without hikite, uke lands badly and you lose control on the mat.
- Entering from too far. The headlock does not replace footwork.
Counters: your back is exposed
Koshi-guruma exposes tori's back. A slow entry or a missing kuzushi lets uke arch, lift tori and counter with ushiro-goshi or ura-nage. Uke can also step around the hip.
In Brazilian jiu-jitsu, the risk is even bigger. A failed headlock throw leaves you with your back to the opponent, the perfect setup for back control. BJJ players use it with caution for that reason.
The hidden bonus: the finish on the ground
After koshi-guruma, tori still holds uke's head and sleeve. Sinking down to the side lands you almost directly in kesa-gatame, the scarf hold. That standing-to-ground transition is one of the best things about this throw.
In randori, do not stand up after the throw. Follow through to the hold.
When to use it
Koshi-guruma works well against an opponent who bends forward and brings the head in, which is common on defense. It also works against an uke who attacks and comes toward you, because the head arrives within reach of your arm.
It works poorly against an upright opponent who is clearly taller. Reaching the neck gets awkward and you expose your back.
Drills
Start slowly. Enter with the arm around the neck and the hips past uke, without throwing. Check that your hip really is beyond uke's body. Then throw on a thick mat, holding the sleeve all the way down, and always finish in kesa-gatame.
With kids, drill one cue above all: "the arm wraps, it does not squeeze." This is the throw where that reflex most often needs fixing, and fixing it early prevents injuries.