19mm. Though a 3/4" six-side would work, even being a bit bigger..

Dimensions — Inches to Metric
0.750”	3/4”	19.05 mm

 

3/4 and 19mm are both the same size

 

Interesting to note looking at a 4-star lug nut wrench. On one particular bar you have metric [19mm] stamped on the obverse & imperial [3/4"] stamped on the reverse. The other bars have similar characteristics.

Would suggest getting either the 19mm or the 3/4" deep well socket along with a 1/2" breaker bar. The OEM tire changer equipment is mainly for show, IMHO.

In addition, there may come a time when, after an overzealous tire dealer crew member over tightens your lug nuts, you may appreciate the greater mechanical advantage a breaker bar that is 16" to 24" length breaker bar has. You might get a good deal on one or both if you visit a local pawnshop.

Of course, the ultimate is a 1/2" battery powered impact wrench. It is quite useful for a variety of maintenance tasks, not merely just rotating your tires

 

Interesting to note looking at a 4-star lug nut wrench. On one particular bar you have metric [19mm] stamped on the obverse & imperial [3/4"] stamped on the reverse. The other bars have similar characteristics.

Would suggest getting either the 19mm or the 3/4" deep well socket along with a 1/2" breaker bar. The OEM tire changer equipment is mainly for show, IMHO.

In addition, there may come a time when, after an overzealous tire dealer crew member over tightens your lug nuts, you may appreciate the greater mechanical advantage a breaker bar that is 16" to 24" length breaker bar has. You might get a good deal on one or both if you visit a local pawnshop.

Of course, the ultimate is a 1/2" battery powered impact wrench. It is quite useful for a variety of maintenance tasks, not merely just rotating your tires

I second getting a proper deep socket and breaker bar. While you are at it, toss in a torque wrench too.

While my wife will generally just call roadside assistance if she has a tire issue, I still put a breaker bar, proper socket, and also a torgue wrench (with the proper torque setting labeled on the handle, and I have shown her how to adjust it properly). There is no way she would be able to loosen the lugs without a breaker bar, and I never want her to be stranded without the equipment to DIY if she has to.

 

Mmmm. I like tools. Maybe consider a thin walled, non-marring lug nut socket set, made for people who have fancy expensive rims they don’t want to scratch up.

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Im also in the category of breaker bar/socket carried in car for flat tires. The battery impacts are left at home.