I have never had an issue with tearing them at all. They are a pretty heavy material. Of course it depends on how the bike was stored. I suppose it they are really sun baked they could be brittle, but in that case you would want to replace them. You could use a hair dryer to soften them up if you think it will help. I use a small screwdriver on my 750's to get the lower lip up from the fork leg and then just work it around.