Wheel changing - little help

[shouldbworking]

Ok, so ive seen some wheels ive liked on the same model as my car. After some hunting ive managed to find and purchase a set after checking the bolt pattern and offset were ok (according to the wisdom of the internet).

Do I need to change the nuts as well as the offset is not exactly the same?

Also im not sure what tyre size to use - the rims are 7" wide, but i want to check clearance issues first - find a friendly tyre shop and check clearance with a dead tyre of the appropriate size before shelling out for a set? looking at either 195/50/15 (maybe too narrow for the rim) or 205/50/15

Do tyre shops normally charge for this sort of checking or is it generally 'free' given that ill be looking to buy a complete set

[tlracing]

I'd guess most of your questions have been answered in various corners of PH, but here goes:

1) If the wheels you've bought are the correct ones for your car then you may not need new wheelnuts. The wheel manufacturer - or a reputable retailer - is the best to advise, however;

2) This link will give you the info you need on tyre sizes:
http://www.tyresave.co.uk/tyresize.html 
The most important thing is to make sure your new tyres have a similar rolling circumference as your OE ones or your speedometer will be out;

3) Excessively wide tyres will put additional loads on your suspension that aren't a good idea as this can lead to premature breakage;

4) You might find a tyre shop that will help, but I guess they'd want you to buy the tyres off them!