Hi. 2013 Skyactiv, and putting on '06 RX-8 wheels with 235/40/18. Front is spaced well, but was thinking of bumping out back with a 5 mm spacer.

However, I am concerned that there will not be enough of the centre hub protruding beyond the spacer to go into the wheel bore to keep it centred (aka hubcentric). I don't want the wheels centered off the studs as that is likely to lead to vibrations.

I suspect to provide good centering capability, it the centre hub will have to protrude at least 10mm beyond the face of the rotor. This would mean that there is at least 5 mm past the 5 mm spacer to go into the wheel centre bore to centre it.

Does anyone know how much the centre hub protrudes beyond the face of the rotor?

Thanks in advance.