No an issue in this case. My speedo is 4% high . New tires are 1.5% less when new so now closer to 2.5%.
https://tiresize.com/comparison/
https://tiresize.com/comparison/
At 100kph on speedo with new oem sizes gps was showing 96kph. Now it shows approx 98kph. I'm happy with that.
New tires cost $1100 the set, from Bob Jane Ringwood, f&b inc old tyre disposal.
Michelin PS4's...
235/40/18 fronts were $160 each.
265/40/18 rears were $390 each
They even look proper on the rims, no bulging, very happy.