What Tyres? e34

[Sav]

Hi I need 3 new tyres, my wheels are 15". The size is 225/60/15. Should I stick with this size, I have seen 235's on the same rims. Can I change the profile? Whch Tyres should I go for. I am on a fairly tight buget in the UK.

Thanks, I dont really want to just take what the local dealer offers.