Ergonomic Exercise Bike Resistance Knob

A purpose-built resistance control knob designed specifically for comfort and reliability during frequent use. Approximately 4.5 cm in diameter (±1–3 cm tolerance), it combines a durable plastic outer shell with a reinforced metal insert at the mounting interface. Its smooth, non-abrasive surface eliminates skin friction—even during sweaty or extended sessions—while its compact size ensures easy portability and storage. Compatible with standard exercise bike resistance shafts, it supports both 8-gear and 10-gear indexing systems. Installation is fully manual: align and twist clockwise until firmly seated. Suitable for home users, physiotherapy clinics, and light-commercial environments seeking dependable, low-maintenance component upgrades.