I've seen 20's and what appears to be bigger on the newer Altimas. You don't
say if a reputable shop did the work or not. If thye didn't observe proper
measurements then you can, and in your case, will have problems.

Frankly, i think 20's are too big for that car but seeing all the Altimas
around with big-assed wheel/tire combinations it seems not too many agree
with me.

Is there a Nissan dedicated website or usenet group you could try?

I made a change to my car and it didn't work.....

Where is the problem? Undo the change and feel good....

However, bring your chequebook and I can fix you up....

you need more air in the tires to cushin the bumps.  go to 16's

If you have the patience, leave your car parked outside the castle,
wait until midnight, and it will turn back into a carriage. You'll
need to get some more wheels and tires, though.

Tires that will turn the same number of revs-per-mile as the stockers
on 20-inch rims for smaller cars have such short sidewalls they are no
longer part of the "ride" system. Special springs and shocks/struts
could make a difference, but the true cure is to go back to the stock
size tires and wheels. Try finding some wheels that look good to you
in standard size.

Or, learn to live with the problems brought on by over-bling.

   As if posting this to a Mustang group didn't prove you're an idiot,
the actual contents of the post proves it beyond a reasonable doubt.

What a dumb a.s question!!!!  However if you want those 20's, I have a
plasma that will fix your problem.