Why not ? ..... as a social duty to F&F community here .
If possible , speak to knowledgeable tyre shop owners showing him my Table 3 above. It's likely he may need help from tyre factory engineer. Salesman probably couldn't help much other than hearsay.


My above comment should be unjustified and not fare due to following:
1) 280 kpa at 210 km/hr for H tyre is NOT unequivocably stated as 'maximum' pressure;
2) Your 88H sidewall has an indication of maximum pressure of 350 kpa. With 280 kpa in Table not stated expressedly as 'Maximum', one may next raise the question what happens to pressure 281 kpa and 350 kpa ??????
Having said this, there is provision for vehicle OEM's like BMW to contact tyre manufacturers on matters beyond what I'd described.
3) Pillar stickers provided by @ceo684 shows 310 kpa that is not provided for in Table 3, hence I suspect in this context BMW (and others like Audi and VW) may have consulted its tyre manufacturers (originating from Germany ????) about the cars design or service conditions (such as for high speed and competition use in say, Autobahn F1 etc ,IDK) and come out with 310 kpa or higher for W and Y tyres ??????

This post has been edited by zeng: Apr 7 2019, 05:48 PM

no load 210 kpa
got full load 300kpa
just stick to the sticker, car manufacturers had done their testing and come out with the best optimal pressure for the particular car model.

i dont know why one had to be so complicated a few post before, just add unnecessary confusion to others.
the point is, if u assume the manufacturer is recommending a wrong pressure for their tyres, in this case 300kpa, then u state that according to yr tyre pressure standard is 280kpa. So neither pressure is 100% correct in that sense right. So say u use 280kpa, is that the correct pressure in the sense of what the manufacturer pressure, no right. This is the same for if u use 300kpa, is that the correct in the sense of the tyre standard, no right?

my point is, as a rule of thumb, manufacturers had gone through all the work and testing by their engineers throughout the development phase of the car model and came out a pressure for their car,.

TLDR, follow yr car sticker pressure. NO Need to WORRY SO MUCH OVER IT. SERIOUSLY.