Here’s the solution to creaking SPD pedals due to hardened shoe cleats gritting on hardened pedal latches:
Those are carefully shaped snippets of open-cell foam tucked around the springs under the movable latches, loaded with a few drops of penetrating oil, and ridden for several months. Nary a squeak or grinding sound has emerged: far better than the results after I added a drop of oil whenever either of us heard that sound.
Similar snippets tucked under the forward latch fell out without affecting the results, from which I conclude:
- The front latch doesn’t squeak
- The foam on the other side is Close Enough
- Penetrating oil oozes into a thin film over the whole pedal
The cleats don’t quite touch the ground when we walk, so we’re not leaving oily footprints.
Should I ever install new pedals, I’ll see if a larger foam block can span the gap between the front latch on the top and the movable latch on the bottom.