49 CFR 574.9 – Requirements for motor vehicle dealers
(a) Each motor vehicle dealer who sells a used motor vehicle for purposes other than resale, who leases a motor vehicle for more than 60 days, that is equipped with new tires is considered, for purposes of this part, to be a tire dealer and shall meet the requirements specified in § 574.8.
(b) Each person selling a motor vehicle to first purchasers for purposes other than resale, that is equipped with new tires that were not on the motor vehicle when shipped by the vehicle manufacturer is considered a tire dealer for purposes of this part and shall meet the requirements specified in § 574.8.