A stock size is 15x7 et24. 1/2" inch narrower would reduce the necessary inboard clearance by 1/4" or about 6-7mm. This hypothetical wheel would then be 15x6.5 et31 so you're not far off. Your et38 might fit without spacers but more likely is you'll need 5 or 10mm.
Last edited by richardodn; 05-25-2019 at 10:36 AM.
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