Motorcycle tyres have 2 life spans which dictate when the tyre should be replaced - 10 years from the date of manufacture / 5 years from being fitted and used. The side grooves are designed to ensure optimal drainage in wet conditions, while the central grooves provide better traction and stability.
Very good tyre life and good grip in all weathers. This is the 3rd one on my bike. The previous one covered around 12,000 miles and was used in a variety of conditions and extensively for two up fully loaded continental touring.