How to Set Up a Derailleur on a Mountain Bike: A Step-by-Step Guide
To set up a rear derailleur on a mountain bike, start by loosening the pinch bolt that holds the cable in place, shift the bike to the smallest rear cog, then attach the cable to the derailleur. Next, adjust the high limit screw so that the chain sits directly over the smallest cog without rattling or grinding. Then, shift the bike to the largest rear cog, and adjust the low limit screw so that the derailleur sits just slightly inside the cog without touching it. Finally, shift the bike through all the gears and make any additional adjustments to the barrel adjuster until the ride is smooth and the chain runs quietly.