Shimano Nexus and Tiagra
On Metal, you will find 2 groupsets: Shimano Nexus and Shimano Tiagra. Shimano Nexus are hub gears, ideal for commuting year-round, and require low maintenance. Shimano Tiagra is however derailleur gears, which are more sports-specific. This means you have 10 gears, which are both precise and lightweight.