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. New WTB tyre protection - SG2 In addition to its low weight, the SG2 tyre protection provides excellent protection against punctures and punctures. Such tires have a high value of 120 TPI - or threads per inch, which represents the density of fibers in the carcass of the tire. This new protective layer is lightweight and features an ultra-thin nylon liner that covers the entire surface of the shell from heel to toe. So you can go out on any surface without fear of punctures. How much more durable are the new tyres with SG2? Laboratory tests show that the addition of SG2 provides 33% better sidewall protection and 17% better tread protection than standard 60 TPI tires without SG2. Gravel rides are becoming more frequent and longer. The riders will not be afraid of difficult terrain. That's why WTB has come up with durable tires that will hold up on any surface. 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