New Front Brake Rotors - which size?

[Metallo]

Hi guys,

Just out of curiosity, I need to replace front discs and it appears the right P/N is: 31400739, 31262706 (whatever has replaced the other).
To be sure, I measured the old rotor: 11.25" or 286mm, so no doubt the above P/N is correct.

However, VIDA says: 15", O DIA 286mm, REPL 1 PCS 31262706

My question is: 15" wheels? I have two XC70, both on 16" with the above P/N installed.

When I look at Tasca, they also say the for 15" wheels.

On the other end, VIDA gives P/N 31262707 12"or 305mm for 16" wheels.

I do not get this.

Any clarification is much appreciated.

Thank you,
Alex

[difflock54]

I think VIDA might be saying that if the rotors are 305mm dia the wheels need to be minimum 16'' to fit with adequate clearances ?
The 285mm dia rotors would suit both 15'' and 16'' wheels.