Not that I put excess fatique on my bikes, because I am not a racer. But, I bought a Scott 510 model in 1993. I have three other bikes. Still, I had to replace it 12 years later. i figure I had to put at least 80,000 on it. I traded in the used up frame for a new Surly Cross Check frame. My bikes mechanic checked out the chain line with a frame checker. The center line was off. He said it was not worth re-aligning the bike in that once the frame has been warped its best just to scrap it. / My mileage log was pretty accurate. 80,000 miles. Guess I have no complaints. / The clue that made me think something was wrong was the difficulity in shifting.