Ever wondered when to replace your worn car tires? The performance of your tyres is critical to the safety, performance and efficiency of your vehicle; the N.H.T.S.A. estimates that about 400 fatalities annually may have been attributed to tyre failures. Most tyres are designed to provide similar performance throughout their lives. However, at some point they start to lose performance in terms of their traction and braking ability. It is also paramount to ensure that the correct speed rated tyre is fitted to your car,  a lesser speed rating can not only invalided your insurance but also be dangerous.