currently got some 18's fitted with 225-40-18 tyres and thinking some 17's might be a better ride esp since my blob is a daily driver and yorkshire;s roads aint the best...these are my current setup

Uploaded with ImageShack.us....wheels are 11 months old so still in great nick and tyres still have plenty of tread..so whats gonna be best size inc tyres to go for and if anyone has any decent 17s for a trade im all ears

 

I have some 17s in gunmetal , prodrive speedlines 7 spoke mate , pm me will send pic.
New tyres aswell.

 

There 215/45

 

I have the same wheels in 17". There about to come off mine as I'm swapping back to my rota's. There in Matt black.

 

You need to make sure that if buying smaller wheels you buy the correct size tyre otherwise it'll look daft (if say the sidewalk profile isn't deep enough).

Example: http://www.etyres.co.uk/tyre-size-calculator.htm