How to Perfectly Adjust Your Shimano Front Derailleur on Your Mountain Bike
To adjust Shimano front derailleur on a mountain bike, start by shifting to the smallest chainring and the smallest rear cog, then use the derailleur adjustment screws to align the derailleur with the chain. Turn the high-limit screw until the chain runs smoothly and doesn’t rub on the derailleur cage. Next, shift to the largest chainring and the largest rear cog, then turn the low-limit screw until the chain runs smoothly without rubbing. Finally, use the barrel adjuster to fine-tune the shifting speed and accuracy.