My buddy ships vintage Mopar sheetmetal all the time, with good results,via Greyhound. I bought a windshield for my vintage boat, and had it shipped greyhound. Came broke, and they were impossible to file a claim with. Can they damage a bike? Dont know. The windshield was screwed to a 2X4, and the wood was broken when it got here. How do they break a 2X4? BUt they were 1/3 the cheapest common carrier quote I got. Packit well......