Adjust the mechanical gearing / Derailleur
The gear shifting does not work properly: gears stay, are skipped or the chain jumps.
- Relieve the rear wheel and have the pedal set free for cranking. Therefore, lean the bike slightly on the side stand or use a bike / assembly stand.
- Shift through all gears one by one while cranking by hand, first up, then down and locate the source of the error.
- Make sure that the Bowden cable of the gear shifting system sits cleanly and is properly tensioned. You can adjust the tension with the adjusting screw on the shifting arm.
- Turn the set screw to the left to tension the Bowden cable, turn it to the right to relax the cable.
- If you have shifted up one gear, but the chain does not jump to the next higher gear, the Bowden cable needs to be tensioned more.
- If you have shifted down a gear, but the chain stays where it is, relax the Bowden cable more.
- If gears are skipped, the cable is too tight or the shifting arm is not adjusted correctly.
- To adjust the shifting arm there are two screws on the arm itself, which determine its position in the smallest and largest gear.
- L stands for Low, the lowest gear (largest sprocket), H stands for High, the highest gear (smallest sprocket).
- Make sure that the shifting arm is always exactly under the corresponding gear wheel and readjust it if necessary.