Shimano SPARE PART FC M391 dbl gear fix bolt Pk4

Rigid arm construction helps maintain alignment under load, giving riders a direct feel during climbs and accelerations Tornillo Fijación Plato 4uds compatibility makes replacement planning easier for workshop builds, upgrades or routine drivetrain servicing Tooth configuration is tuned for smooth cadence changes, helping keep momentum across mixed terrain and varied riding speeds Durable finishing helps resist everyday wear, keeping the component suitable for regular road, gravel or MTB use 5mm / FC-M391 drivetrain layout supports efficient power transfer, stable pedalling and dependable chain engagement