Online Price: $35.99

Bullet-proof Kevlar mesh renders our compression resistant Flak Jacket Derailleur cable housing lighter, more flexible and impervious to thrashing. Ultralow-friction stainless steel inner wires make for smooth, effortless control. And the Shield-Lock liner slip over the Shield-Lock ferrules to seal the entire system from mud, grit and grime. The Tree Fort Bikes Take: We have used this lifesaver many times to compensate for finicky derailleur problems. It really does seal out most of the dirt allowing situations, such as those caused by low-normal derailleurs, to move more smoothly.