Gear Adjustment:
A noisy gear, or poor gear selection, is often because the chain is not lined up precisely with
the cogs.
Looking from the back of the bike, line up the chain using the adjuster.
First select and line up the chain with gear 1 and then check again using the highest gear.
Turn the adjuster clockwise to move the derailleur and
so guide the chain to the right, anticlockwise to guide it
further to the left.