i drive my smart a bit fast on on/off ramps (usually 50-100% over posted speeds) with stock tires, the little triangle has never lit up (it lit up once driving on ice in my parking lot last feb), i was used to driving a geo metro (stock wheels/tires 13x4.5 with 155/80-13, new wheels/tires 15x6 and 195/50-15) totally transformed the car, the stock tires would HOWL in turns at 20mph, the fat tires were silent and grippy at 40mph in the same turns.
i'll probably get 2 more smart 15x5.5 rears (steel/pures) for the front and pop for 195/50-15s all around, and keep the plastic wheel covers all around. the smart is 100 pounds lighter than a metro, and the metro was front heavy, the smart is not, so the smart should be a super-gocart with this configuration.
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