The K2 S2 < Premium Quality >

The "ghosts" in the system were eventually identified as —mathematical representations of how the gravity of the Sun and Moon physically warp the Earth's crust.

If you search for "The K2 S2" and find a bike component, note that K2 Bikes used an "S2" geometry code for their 29-inch wheel hardtails in 2018. However, the overwhelming consensus in 2025 points to the Recon S2 Boot as the definitive product for this search term. Gear up and go shred. the k2 s2