I hammer mine, why not? Their probably stronger then the new ones! I rode most of mine of mine up down the mountains of S California without a thought or a worry about breaking something. Heck one of my bikes has over 150,000 miles on it and about 2/3rds of those miles is mountains with about a third of it racing, and it's still going strong today. Funny thing, the only bike I ever broke was a Klien aluminum racing rig that fatigued at the head tube and cracked after just around 20,000 miles, I will never buy another aluminum bike.