Fitting Non Standard Tyre Size Rant

No, M14 vs M12 makes no difference with a tapered head.

5x114.3 is used on Infinity and Nissan aswell (pretty much all of them): x-trail wheels maybe?
 
Not sure what the answer is here, but merely a rant.

Ordered 4 new tyres for my Dacia Duster.

I decided to order 235/55 R17 over the standard 215/60 R17. The rolling radiuses are identical and there is ample room to go wider. Standard wheels are 7" wide if that makes any difference and thought the extra 20mm in tread touching the road would be a pleasant addition.

Garage refused to fit them and they've had to be sent back to the supplier 🙄

When I arrived the garage was quiet and the 3 guys working there were just sitting doing sod all. I suspect it was any excuse not to work.
I worked at a Goodyear shop and we regularly used the tire size calculator to check overall diameter. We frequently changed sizes for winter tires to get a taller narrower tire (better in snow) plus steel winter wheels were usually cheaper if you went down a size.
No guarantees but maybe try a Goodyear shop. Or as mentioned above bring the wheels in separately. I had to do that years ago when I had a blowout on my Cutlass right in front of Canadian Tire and they wouldn't put the non standard size.
 
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