Easy, cheap, and quick; my favorites. The only thing to buy is 2 pieces of 1/2 inch conduit. The only tool is a conduit bender which you can likely borrow from the hardware store or an electrician friend. The bender is not too expensive if you need to buy it. I've heard you can fill the conduit with sand and use a vice to bend it also, but I think this would be hard with poor results.
Step 1: Rafter Side
Step 2: Measuring Length
Doing the math 1.5 feet rafter bend, 1.5 feet bike bend, 4 feet from rafter equals 7 feet needed from a 10 foot piece of conduit.
Step 3: Bike Side Bend
The bends from rafter to the bike should have the hook (conduit) looking like a letter "C" , NOT a letter "S". A "S" shape is not stable.