Unfortunatly I been having some issues with one of my tyres/wheels. My left front tyre is been loosing pressure since day one (I bought a 2011 Scirocco 2.0GT 170hp 2 years ago) but because it was minimal I thought it was the tyre with some sort of puncture or so. So I bought a brand new set of tyres and the issue kept going. Every 2 months I was checking tyre pressure and I wsa loosing about 2/3psi (out of 35). Lately I am loosing about 5/6psi every 2/3weeks.
I took my car to 3 diferent tyre/wheels houses around my area and they didn't find any problem either with the tyre or the wheel... But the last house I've been mention that it could be a minimal crack/fissure on the wheel. I've asked how much would cost to repair it, and because they could not find the crack/fissure it could go up to £250 and over to get ir proper fixed. So I've decided to get some new set of wheels (have my eyes on this ones: http://www.wheelbasealloys.com/alloy-wh ... ed/18-inch" onclick="window.open(this.href);return false;) but they ask me for my whell off set measures witch I do not know how to get...
Does anyone have a clue witch one is it?!
I have 18'' Interlagos wheels

Thank you all for your help!