Hi i recently upgraded my 15 inch alloys for 17 inch s spokes i put them on they look brill however i dont know if its just me but the steering feels different!! do i need to get the tracking doing? or the wheels balancing?
I found this too when I fitted my 17" from my 15" like Scrogg says you've got more rubber in contact with the road so it will tramline a bit more. Picks up on the shape of the road more and will feel a little more twitchy. I only found it on rough parts of the road and you will get used to it.
I always track my car professionally when I get any wheel mod (change tyres included) done. Its very important for the wear of your tyres too.
DON'T GO TO BMW! They do 4 wheel laser tracking and they cost a fortune about £150 no joke. Go to a good tyre place. Sometimes Kwikfit say they can't do MINIs but some do. I go to Protyre who are really good but I'm down South. Don't know where you are.
Your wheels should have been balanced when your tyres were put on so I wouldn't worry about that but tracking costs me about £25-£30 shouldn't be more than that even with the 4 wheel laser tracking that protyre do. BMW have some cheek!