Originally Posted by dingy
measure rim.
Take mid point thats zero
Sure you can work the rest....
42 is 42mm added to the centre that will pull the wheel in....so make it 35 and you have 7mm of ya wheel sticking out......

cheers dingy, but if the wheel sticks out more the tyre starts hitting the arch, ya know when ya get a lower offset is the wheel a different shape so the tyre doesnt stick out as it does when you just put a spacer on it? ie does it curve back on itself more?