What Our Gearhead® Experts Are Saying: "I’ve seen too many pivots and cable junctions wear prematurely without small pieces like this. The AP306 boot is simple but it seals out grit and water so your Cannondale keeps running smooth."We know how even the smallest components can make or break a ride. The Cannondale AP306 Rubber Booty Kit is designed to safeguard critical interfaces on your frame, adding a protective barrier against water, dirt, and road debris. By keeping contaminants out, this flexible boot extends the lifespan of your bike’s moving parts and helps maintain factory-smooth performance.