What I do is get a long pipe for leverage with the original lug wrench.  Or
take it bake who ever put the tires on and tell them to loosen them.

A couple of things you can try:

Beat on the back of the tire with a hammer at several places.  Stay off of
the rim with the hammer blows.

Reinstall the lug nuts about five or six turns and then drive the car a
short distance while turning the steering wheel left and right.

Take the car to a tire shop and let them worry about it.

good luck

   You might replace the lug nuts, drive it hard enough for the wheels to
heat up, and rush back to the *removal station*.  The difference in heat
transfer between the (steel) hubs and (aluminum) wheels should expand one
material faster and allow removal.  HTH, s

Put the lugs back on then loosen one turn each.  Drive around the
block, make sure you brake hard and take a sharp turn at least once.
Wheels should be loose by the time you get back in the garage.

good luck

nate

I would recommend putting a lot of good penetrating oil into each stud
space and any other place that will allow it to get behind the rim.  You
might need to do this many times over a couple days to get it to soak
through.

I live in the rust belt and see aluminum rims that have fused to the
hubs so that both get destroyed when it finally comes off with 2 shop
guys running at it from the back side with a railroad tie battering
ram.  

When putting them back on I recommend a lot of antiseize compound on the
back side of the rim to help for next time.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

What I do use use a long - about 6' - prybar and judiciously apply leverage.
You can break a wheel if you make a mistake.  What I have seen pro's use is
a large orange soft-blow hammer - 4' long handle and about an 8 pound head,
or the aforementioned pry bar.  In a pinch, I have kicked, beaten upon etc,
and I have loosened the lugs and driven about slamming on the brakes.  In
one case, I just gave up and took it to a tire dealer, where he did all of
the above but with more vigour than I was comfortable with.

Brian

Cheater bar, dude.  Get a empty pipe, put it at the end of the tool
you're using to loosen the lug nuts,  and just use good 'ol leverage.

Failing that, go get someone with an air wrench.

HTH.

-LMB

We run into this all the time with the aluminum wheels.  So far, I've
never had any problem getting them off.  Use a long, large pry bar, and
you pry between the wheel and the rotor or drum...or the whatever happens
to be close to the rim of the wheel (from the back side) that is solid.
It will pop right off.  Do not attempt to hammer on the wheel itself unless
you use some sort of rubber or plastic deadblow hammer.

Ian