Will 18" A6, C7 wheels fit on a 2016 SQ5, B8 ?

[5000S]

I am wondering if these will fit, same bolt pattern, etc.? Concern may be brake clearance.
Thanks

[Smac770]

C7 A6 18" are 18x8.0 et39. B8 Q5 18" are 18x8.0 et39. B8 and C7 both use 66.5 5x112. So basically the same wheels.

If the SQ5 can have 18" wheels, then you're fine. If the SQ5 brakes required at least 19" wheels, then you're out of luck.

The B8.5 Q5 345 fronts and 330 rears both quote a min wheel diameter of only 17". But the B8.5 SQ5 had 380 fronts and 330 rears. Digging up the B8 Q5 brakes workshop manual, it lists the 380x36 fronts as 18" min. So you should be fine.

[02 A6 2.7T]

I am wondering if these will fit, same bolt pattern, etc.? Concern may be brake clearance.
Thanks

You will need a new set of lug bolts, as the spherical radius for the A6 rims is R13mm, while the factory SQ5 uses R14mm lug bolts.
They might look the same, but run a high probability of coming loose due to the incorrect contact pattern ... not good ...

[Smac770]

Yeah, seems the Q models (Q5, Q7, Q8) and the A8 armored car use R14 ball seat, not R13 ball seat like the rest of the Audi cars (the VW clone products, A3/TT/Q3, are not even 66.5 center bore, so not even acknowledging them).

A4, A5, A6, A7:
lug bolt WHT 002 437, M14x1.5x27, 1-piece, 17mm hex, R13 ball seat

S4, RS4, S5, RS5, S6, RS6, S7, RS7, A8, S8:
lug bolt WHT 002 438, M14x1.5x27, 2-piece short cap, 17mm hex, R13 ball seat (Audi quotes it as x35mm, but that's to the base of the bolt head, not the ball seat collar)

A8 armored, Q5, SQ5, Q7 (4M), SQ7, Q8, SQ8, RS Q8:
lug bolt 8R0 601 295, M14x1.5x30, 2-piece long cap, 17mm hex, R14 ball seat (Audi quotes it as x45mm, but...)

Q7 (4L):
lug bolt WHT 001 693, M14x1.5x27, 2-piece long cap, 19mm hex, R14 ball seat

So while the rest of the wheel specs are the same, seems you'll face a different ball seat radius changing between "A wheels" and "Q wheels".

Just can't keep it simple, can they.