@noneck I put the front wheel of the towed bike partly in there, and then used 3 bungees: #1 holds the bottom of the towed bike wheel close to my bike #2 goes through the towed bike front wheel to stop the towed bike from shifting too far forward and back and #3 goes through the frame and wheel of the towed bike so the handlebars don't turn too much, and i hooked that onto my rack too, just in case.