Having worked in the trade for a very long time , I've come across this problem myself several times .
A little tip that I found very useful for removing these little blighters is to get a bit of rag and push it in behind the wheel . Tuck it in as far as you can get it then pull the remainder of the rag forward so it completely wraps the wheel up .
Then pull and it should come off .
By using the rag your simply spreading the pulling pressure right around the wheel . Might take you a couple of goes but you will get the general idea after your 1st attempt
