Originally Posted by Jules59
Try pouring boiling water from a kettle onto central part of the aluminium wheel. Differential expansion (a miniscule amount) is often enough to break the corrosion "glue".
Tip passed to me from an AA bloke.
Either that, or slightly
loosen all the wheel nuts, jack the car up and lower it slowly (always keep some of the weight on the jack) - the weight of the car will break the corrosion.