twk63

I'm about to pull the trigger on a 2012 Panamera Turbo S with PCCBs.

I wanted to know what the correct offset would be for 20" wheels to clear the PCCB calipers? Tire Rack is defaulting me to 21" aftermarket wheels but I'm pretty certain that 20" OEM wheels will fit the vehicle.

TAG ceo

There were no 21" wheels available until 2017 model year. All the 2010-2016 offered a choice between 18"- 20" but you will need the 20" ones to clear ceramic brake calipers.

twk63

Thanks, it is the correct offset I need that I am worried about more so than the wheel diameter.

Santa Cruz Red

Not sure if this helps... as a fairly recent, new owner of a '13 Turbo (non S), the wheel specs are 9.5" front w/65mm and 11" rear w/68mm.

DMoore

If you have access to it, look in the owner's manual. The wheel sizes and offsets should be listed there.

DMoore
'18 Panamera Turbo Sport Turismo
'18 911 GTS

Deezflip

Yes the diameter is the easy part. Congrats by the way, I just recently scored on a Turbo S also. This will be just my second post!

Offsets can be tricky when it comes to caliper clearance. Offset is simply the position of the back surface of the wheel face where the wheel mounts on to the face of the rotors. Having a 0mm means that it's right in the middle of the barrel. +60mm means it's 60mm towards the face of the wheel, -60mm means the opposite and going towards the unfinished side of the wheel(this what makes the wheel poke outside of fender)

Now, some wheels provide disk spacing measurements(most do not)...which is basically that flat surface on the back of the wheel face where it mounts into the rotors. This varies highly on the spoke design as some concave out and some concave in and it's difficult to get an accurate measurement.

Still confused you say? The best way I can described it is....imagine if you stuck some wheel spacers on to the backside of the wheels, that would increase the disk spacing or as some people say...back spacing. This will pull the spokes further away from the calipers.

See the pic attachment, notice the differences in the spokes regardless of the offset....it can still snag a brake caliper