Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Flimsy plastic buckles broke causing my bike to fly off

I thought this product was fine for occasional use. I used in once to cart my bike about 15 miles locally - no problems. Threw out the packaging because I decided it was a keeper. Then today, after driving on the interstate for 700 miles this week, we got back into town, went over a speed bump at about 25 mph, and both plastic buckles holding my bike onto the rack broke and it flew off. My rear wheel is bent beyond repair, and I had just had it in for a major tune-up.