Why Is My Car Shaking? Daytona INFINITI If your car shakes at high speed the cause is often mechanical imbalance. Small issues become more noticeable as speed increases. Unbalanced tires are a common reason, creating vibration that grows Why Is My Car Vibrating at Higher Speeds? Steering wheel shaking at highway speed? Dont ignore it. , That vibration is often a sign of issues like unbalanced tires, worn suspension parts, or brake problems. At high speeds, even small