The issue with 19" on the M5 is the ideal sidewall is 40 for 285/295 or 285/305. I can't think of any common track or R compound that would come in such sizes. Our customers putting out serious power with the F90 run R888R 285/35/20 front and 305/35/20 rear. No traction issues. Still within specs of front to rear OD ratio.
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Jimmy | BMW Addict | Signature Performance Wheels | OBSESSED WITH PERFECTION | IG: Signature_BMW | Email: jimmy@signaturewheel.com
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