My new shoes/cleats seem to have "vertical" movement (not lateral float) and I can't figure out why, or how to fix it.
I recently got new shoes (Shimano XC-7) that use the same SM-SH51 standard Shimano cleat that I have been using until now in my old Giro shoes (probably 3 years on the old shoes/cleats). Same pedals, same set up, but if I pull up on my foot, I can create a clear gap between the shoe and the pedal - it isn't disengaging or coming out (i.e. I'm not unclipping). There is definitely a little more float than w/ the Giro shoes, but I can't tell why.
There are no shims under the cleats that I can see (unless they're inside the shoe, under the foot bed, but that shouldn't interfere w/ how the pedal interacts w/ the sole of the shoe).
Any ideas what causes this or how to fix it? It's a bit disorienting; I will probably be able to get used to just tweaking my pedal stroke, but that seems not optimal.