The SM-CN900 Quick Link chain lock is compatible with 11-speed chains, making it suitable for your bike with 11 gears in the rear. It is designed to work with current 11-speed Shimano chains and allows tool-free installation. The number of chainrings at the front (2 in your case) does not affect compatibility, as this quick link is specifically for the chain's speed compatibility, which is 11-speed here.