How to Adjust a Derailleur on a Mountain Bike for Optimal Shifting Performance
To adjust a derailleur on a mountain bike, first, shift the chain to the smallest sprocket at the back and the largest at the front. Next, loosen the cable attached to the derailleur and adjust the derailleur position, so it aligns with the smallest sprocket. Then, reattach the cable and shift the chain to the second smallest sprocket. Use the barrel adjuster to align the derailleur with this sprocket. Repeat for all sprockets, making sure the chain runs smoothly and doesn’t rub against the derailleur cage.