Chain Skipping LIKE CRAZY
Right after I cleaned and lubed the chain (TONS of gunk!), I Was Just Riding Along and the chain is skipping like crazy. Like 2-3 jumps per crank. The chain measures right at 12" (not an extra 1/8" or whatever the tape measure rule is that says your chain is worn out), but (and this is a big but), the chain is way forward of the teeth on the cogset. That is, when I put a bit of pressure on the crank, I can see a big space between the chain rivets and the teeth behind. Maybe the cogset needs replacing but the chain doesn't? What do I need to check next?