When I was rebuilding my old Trek 4300 mountain bike I removed the clear plastic chainstay protector. Ten years ago that protector was clear, but after years of riding in inclement weather it was almost yellow. Removing the old protector was not all that difficult after I warmed up it with a hair dyer. I had planned on buying another self-adhesive plastic chainstay protector, but ended up buying a black Lizard Skins Chainstay Protector instead.
Lizard Skins Chainstay Protectors are made of 2mm thick Powertex neoprene and serves two main purposes. First, it prevents scrapes, nicks, scratches and gouges on the chainstay. Second, it prevents that horrible noise created by chain slap. These protectors fasten around your chainstay in just a few seconds and are held in place with a heavy-duty strip of Velcro.
If you have a rear derailleur on your bike, especially if it is a mountain bike, you need these protectors! I was so happy with the first one I purchased that I went back to the bike shop and picked up two more for my other mountain bikes.
Lizard Skins Chainstay Protectors retail for $8.00 to $10.00 each and come in five sizes (Standard, Jumbo, Super Jumbo, 29er Jumbo, and Swing Arm Protector). These protectors come in four colors (Black, Red, Blue and Green). I am also happy to report that these products are made in the USA (one more reason to like them).