I don't personally own the stand but my cousin has never had a problem with it crushing anything and he has used it on I think every kind of material bike frames and seat posts are made of. He has even tried it on a bamboo frame with no problems and he has owned the stand i think going on 2 years. His only problem with the stand is the rubber they use on the jaws tends to ware out a little faster then the park tool stands. But you can order them seperatly from a few different places for cheap.