Gravel Riddler tire designed for high speed in a wide range of conditions.for riders who place equal priority on off-road traction and rolling speed.numerous aggressive side lugs and a low center tread ensure speed and confidence in the terrain. The Riddler 37 keeps your feet in the game for hours and provides tenacious grip in the turns. Incredibly versatile, the Riddler 45 expands your gravel horizons and easily handles longer rides over tougher terrain. USAGE: Gravel / Cyclocross / Bikepacking CONDITIONS: Pavement / Hardpack / Dirt / Gravel Size Level ETRTO GMS Tubeless Compatibility Casing Puncture Protection Weight Compound Min-Max Pressure* Part Number 700c x 37mm TCS Light/Fast Rolling 37-622 37/38 TCS Tubeless Single-ply 60tpi n/a 465g Dual DNA 30-55 psi W010-0641 700c x 37mm TCS Light/Fast Rolling 37-622 37/38 TCS Tubeless Single-ply 120tpi SG2 481g Dual DNA 30-55 psi W010-0852 700c x 37mm TCS Light/Fast Rolling (tan) 37-622 37/38 TCS Tubeless Single-ply 60tpi n/a 465g Dual DNA 30-55 psi W010-0694 700c x 45mm TCS Light/Fast Rolling 44-622 44/45 TCS Tubeless