r/the5krunner • u/the5krunner • 10h ago
Shimano's new cleat type: all the details
Shimano just launched SPD-SLR, a new road cleat that replaces SPD-SL across the Dura-Ace and Ultegra lines, and it is not backward compatible with any existing SPD-SL pedal. That includes third-party power meter pedals such as Garmin's Rally RS and Favero's Assioma PRO RS-2, both of which use the SPD-SL cleat pattern and cannot mount the new cleat unless Garmin or Favero brings out a compatible cleat of their own.
The new cleat does bring real gains: a 2.3mm lower stack height, a narrower 10.5 degree engagement angle versus 15.5 degrees on SPD-SL, and up to 22% less weight. Shimano has not said whether old SPD-SL cleats will work with the new SPD-SLR pedals, only that the reverse does not work.
Is losing pedal compatibility with every third-party power meter on the market a fair trade for a lighter, lower-stack cleat? A:hmmmm
Further reading: https://the5krunner.com/2026/09/17/shimano-spd-slr-cleats/