This is a big one! The CST Toboggan is an oversize studded tire, suited for the most extreme conditions. Take a look and see for yourself!Specifications:Defined Color: Black Color: Black ISO Diameter: 559 / 26 mtn Tire Type: Clincher Tire Diameter: 26 Labeled Size: 26 x 4 Tire Intended Use: Winter-Studded Tire Intended Use_35: Winter-Studded Tire Bead: Wire Tire Bead_36: Wire ISO Width (mm): 102 Flat Protection: Tread