With the Zero Wobble bolt and the tubular construction, this unit is rock solid. No matter how hard I cinch one tie strap or the other, the carrier doesn't flex. There is zero movement during driving, which I like and give me confidence that the bike won't fall off. There's two things I would like to see improved. 1. The bike will not stand up on it's own without die downs. Not with a 21" wheel. I would like to see a bigger front wheel cage to hold bigger wheels. 2. There is no safety for the zero wobble bolt. I would like to have a longer bolt with a hole where you could insert a pin.