Correct tyre size for 17" wheels on a E36 touring ??

[addsvrs]

Evening, currently have M3 Motorsport alloys on my Touring, just took them off to put on my winters. The tyres on the 17" need replacing for next year and was trying to find out the correct / recommended tyre sizes. At the moment they are 225 / 45 / 17 on the fronts and 235 / 40 / 17 on the backs. All wheels are the 7.5J size so are these current sizes ok??

Also any recommendations for a good mid range tyre, sub £100 per corner, have Uniroyals as my winters and i'm really impressed with them but looking at their website all their tyres are rain based. So much choice out there really is confusing.....

cheers in advance

[4rephill]

For the original 3.0 M3 with 7.5" alloys BMW specified 235/40ZR17 all round.