Message 1 from Client:<br />
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take a look at this link, this is how staggered fit ( wider rears results should look)<br />
Should show tyres only available of matching makes and tread patterns as combinations(results)<br />
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https://www.wheelbasealloys.com/alloy-wheels/riva//hyper-silver/19-inch-wider-rear/bmw/6-series/f12-f13<br />
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Message 2 from Client:<br />
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Ok but can you sort the tyre sizes out  for staggered fit wider rears example <br />
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https://www.roadcircles.com/wheels.uk.com/index.php?route=product/wheel/configurator&ot=m&make=BMW&model=1 Series Coupe&year=2009&wheel_diameter=18<br />
This should show same as fitment data<br />
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https://catalog.pro-fitdata.com/<br />
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So should default to tyres as per the models page,225/40/18 (Front) + 255/35/18 (Rear) then also offer selective options as per the plus sizes page<br />
see