Quote by MBB:
"It has been exposed to a significant amount of road salt on almost every ride, due to our record snowfall this year. I am sure that is a contributing factor."
You just may be on to something, Captain Obvious...
What are you doing wrong? Aside from not relocating to sunny Georgia and sipping Mint Juleps in the shade...
You need to be soaking your bike in a good rust inhibitor/corrosion inhibitor. In fact, you should be using so much of it...knowing your winter riding habits through the War Zone at night...that you would be investing in their public stock offers.
Buy any of these products by the 55-gallon drum: CorrosionPro Lube, CRC Heavy Duty, LPS-3 and/or Boeshield T-9 .
Use them in liberal amounts. Apply before riding. Apply after riding. Hell, apply them AS you pedal. It is Detroit, after all.
You need to be cleaning your driveline immediately after a salt brine soaking. In fact, if I were you I would be coating the inside of my frame tubes twice per winter. And storing your bike inside, in a warm area, after your sub-zero midnight escapades only encourages condensation and death from within. They make a product...Frame Saver IIRC...just for those that subject high quality thin-wall steel tubing to such abuse.
And no...living in some faux-safe United Nations enclave with an art museum doesn't mean anything except they can afford to buy Great Lakes freighters full of salt from salt mines under Lake Erie and spread it 2" thick on what little suburbia remains within the 250-kiloton blast radius that is the greater Detroit metroplex.