Even in tacky, muddy terrain, the Magic Mary Addix Evolution 27. 5in Tire shines. Strong shoulder studs increase cornering traction, and an aggressive, open tread sheds mud while also providing excellent grip. The Magic Mary is highly robust with a long life that's ideal for gravity riding, and it's the perfect choice for nearly any track. This tire gives us what we bargained for and more for our downhill and enduro escapades.