Preventing Frame Corrosion

Steel frame bikes are corrosion prone if you ride in winter with salt on the roads.  In an older post, I showed what happens when water doesn't drain out of a frame.  For better protection, you can spray cavity wax inside the frame tubes to ensure it won't rust from the inside.  My Miyata could definitely use this treatment:

My favorite product to use is called Fluid Film, and there is another bike-specific option called Frame Saver.  For my Miyata frame I am just using an old can of 3M Rust Fighter (I don't think this is available anymore).  With my bike completely disassembled it was easy to spray inside of the tubes. However, you can do a good job by just removing the bottom bracket and seatpost.  Here's how I did it:

 

You can also spray the top tube through the opening in the seat tube when the seat post is out of the way.  With the bottom bracket out, there is easy access to the chain stays, seat tube, and down tube:

There are also small holes in the frame near the dropouts, these are very good places to spray:

 

Don't forget the fork: