Quote:
Originally Posted by PaulE
The different brands of tires (tyres) have different levels of grip and different slip angles. This will be a problem when you least need a problem, in an emergency maneuver when you have to steer or brake very hard or when you run through standing water at highway speeds.
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Different brands have different levels of grip b/c companies use different rubber compounds. A tire may even have different compounds across the tread - the outside may have a harder compound vs a softer compound in the center or inside of the tire. They do this on track centric tires so you don't rip the outside of the tire off. Each brand uses its own compound based on what it believes is the key emphasis for that tire - traction, longevity, ride, etc.
As Paul stated, mixing brands may not be an issue in dry conditions but you'll notice it in wet or temp extreme (hot or cold) conditions. Based on where you live, extreme conditions are in play. You'll end up with a wicked handling car if you mix brands.