when you say less im assuming you mean that the offsets will be lower than standard if this is the case then the wheels are likley to be around 0 to -15 et which means they will more than likley protrude the arches slightly this is assuming stadard offset is in the et35 region, if you want to get a little more percise then either google offset calcualtor or you can calculate it your self rembering that the et is the number of millimeters the mounting face of the wheel is away from the wheel centreline.