SRAM Mechanical Derailleur Shifting Inconsistency

To verify a mechanical shifting issue, perform a visual and tactile inspection of the drivetrain. Check for inconsistent gear engagement, chain rub, or sluggish lever actuation. Use a derailleur hanger alignment gauge to confirm the hanger is perfectly parallel to the cassette, as even minor deviations cause poor shifting. Inspect the cable and housing for visible kinks, rust, or excessive friction. Finally, cycle through the gears to determine if the chain consistently fails to reach the high or low limits, indicating a need for adjustment of the limit screws or the B-gap distance.

Sources