There are many solutions available for you to protect your bike frame. You can mount a Down Tube Armor which is a rigid protector installed under the frame.

Another solution is the Skin Armor which is a polyurethane film that can be used at different places on the frame to protect it from bumps and scratches (down tube, underside of the chain, brake cable tracks).

Advice: if you are planning to sell your bike, you will find that a frame that has been properly protected will be more appealing. 

Yes, you just need to use the heat from a hairdryer to unstick it.  The glue residue can be easily removed with a little alcohol. You can then put a brand new Skin Armor in place of the old one.

Thanks to its Glue Shield technology, Skin Armor’s sticky surface is criss-crossed so that any remaining air bubbles are forced out leaving a perfect seal to the frame. No bubbles or creases.

Skin Armor is expected to last 10 years on your bike. The time and condition depends on how often you use and clean your bike. 

The Crank Armor has been made from a soft and stretchy material which makes it compatible with the majority of crank sets on the market. This product is bolted in once the pedal is fixed on.