Some thinner and lighter wheel spacers (like 3mm, 5mm spacers) may not come with hubcentric lips. Without a hub-centric lip, there is no problem with the center bore chamfer interference. But the wheel hub height still plays an important role in the spacer fitment. Assuming your wheel hub height is 8mm, if you add a 3mm spacer, the remaining hub height that contacts the wheel will be 5mm (8 – 3 = 5). If you add 5mm spacers, then there will leave a 3mm hub height of contact. The less hub height that supports the wheel, the higher risk that the wheel gets a vibration. Since these spacers are flat, if the wheel bevel wide enough, there will be a gap. Some fierce impact may push the wheel off of the hubcentric band, which will also result in vibrations. In these cases fitting a 3-8mm spacer needs a very careful calculation. However, things can be easily solved if you contact our tech staff.