Well I dont know what you mean by "High speeds",are they real GM ZR-1 wheels?? If so you should be able to run them as fast as a ZR-1 would go. If they are replicas well take your chances on high speeds like The Silver State. I would want a wheel made for that purpose..........
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68 Mustang Coupe,5.0 EFI ,T-5 5speed,18" ADR's,275/40/ rears,225/40 fronts....yeah a start. 
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