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Old 08-17-2019, 10:38 AM   #8253
Scooby Newbie
Member#: 501522
Join Date: May 2019
Location: Front Range, Colorado
2019 WRX STI
Pearl White


OEM is 18x8.5 with a 55 offset.

Assuming that only the wheel width matters to keep the same backspacing to avoid rubbing on suspension the 18x9.5 would require a 43 offset. 45 is safe. No way the stock clearance is less than 2mm.

The 18x9.0 would require a 48 offset. 50 is safe.

To keep it as close to OEM as possible you should stick with no less than a 45 to 50 mm offset.

Tire rack shows a wheel 18x9 with a 55 offset for the WRX. So the OEM 55 mm offset is OK with at least some wheels even with a 9 inch width. This implies the stock inside clearance is more than 7mm.

The +38 offset is closer than the +35 to OEM, but not enough to matter. Wheel width does not affect scrub radius, only offset does. Change in scrub radius will affect handling during hard stopping, heavy acceleration and hard turns. Wider wheel width affects handling similar to tire width, and will improve handling on dry roads, and slightly decrease handling on wet.
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