So the OP has fitted the correct sizes for a factory fitted staggered rim fitament, so can't see it being the problem....VE HSV's had this arrangement...
I'll also add in I can't say I have read about anyone else having this sort of issue when they have changed to a staggered arrangement...Be it the 19" staggered arrangement as per the OP or 20" staggered arrangement which is fairly common on this forum
Yeah I can’t see it as being an issue either but none of us really know the limits that the ESC system accepts in terms of fitted wheel sizes before off things go of kilter which is why I me toned the issue of module calibration files (interestingly there are no such tire size related files for ABS/ESC so such may not have be exposed with tis2web).
As I said,
Personally I don't think the car should be that sensitive to small changes in loaded wheel radius but who knows other than the manufacturer or the dealer servicing experts (that the dealers are supposed to be)
and
At the small %age differences in rotation per km, I doubt it’s a tire issue which is why i suggested finding someone who's a good diagnostician to fault find.
As is, the ESC control system must be able to cater for different tire stickiness (cheap quality rubber isn’t as grippy as performance rubber, skinny tires aren't as grippy as fat tires), road surfaces adhesion variability (different bitumens have different grip levels as does dirt roads), tire inflation pressures differences (as one low pressure tire impacts diameter*) and such daily variabilities without ESC going spastic and applying the brakes at times that don’t require ESC intervention.
Having said that, if one has ESC issues after changing to staggered tires, the logical step is to change back to the factory setup (non staggered) where the problem didn’t manifest. Doing such will help to confirm whether the issue is or isn’t tire related. If the problem does away after changing tires back to those fitted to the car previously, then it must have been some tire related calibration issue. If the problem still exists after changing tires back, it may just be an unfortunately timed failure that coincided with the tire size change. It’s just the first step along the road to finding a solution.
As a side, Holden‘s “Subject Matter Experts” told me in no uncertain terms that changing from staggered wheels to 8.5” all around can’t be endorsed due to ABS/ESC issues (which I thought was a bullshite cop out if I’ve ever heard one because ABS/ESC is a reactive and not predictive control system should cope with a large variety of conditions including low pressure in a tire). If such is true, then the inverse is can also be an issue. Reality is that if a vehicle’s ABS/ESC design is so restrictive around rim/tire size and tire pressure, then we have far bigger problems
* In fact some tire pressure warning systems use ABS wheel speed to determine one wheel is too low in pressure rather then pressure sensors installed within the wheel).
