Universal Cycles -- Shimano Nexus Inter-7 SG-7R45-7 Small Parts Kit [KSM7R45N010H]
Gear Rear Hub Nexus Sg-c3000-7r Inter 7 Speed Bearing Bike Hub For Roller / V Brake City Touring Trekking Road Bike Hub 32 Holes - Bicycle Hubs - AliExpress
How to setup and adjust a Shimano Nexus Inter 7 hub gear bicycle DIY - YouTube