The Michelin Pro Race 23 mm and 20 mm have done fairly well in races. They grip well in dry and wet conditions. Good for cornering.
For using them racing the 23 mm, I like to have less then 1,500 km on them and for the 20 mm I like to have less then 1,000 km.
For max life span the 23 mm seam to be in the 3,000 to 3,500 km range and the 20 mm at 1,500 to 2,000 km. Keep in mind I am hard on my tires so your mileage may be better.
