A more durable version of the popular GravelKing SK with a more aggressive tread pattern. The ProTite Shield Plus protection layer provides better durability. The tire is designed for riding in tougher conditions, on unpaved roads and is not afraid of mud. The ideal choice when you don't want to worry about whether it's dry, wet or which way to go. ZSG Natural Compound technology creates a softer compound that is overlaid on the outside with a harder compound for increased durability. AX-Alphacord technology uses the highest density, flattest fibers possible for flexibility, lightness and increased puncture resistance. Product code Size ETRTO Tread Color Sidewall color Weight(g) Recommended inflation pressure(kPa) Recommended inflation pressure(PSI) RF732-GKSK-P-B 700×32C 32-622 Black Black 360 TLC: MAX 400/TUBED: MAX 650 TLC: MAX 60/TUBED: MAX 95 RF732-GKSK-P-D 700×32C 32-622 Black Brown 370 TLC: MAX 400/TUBED: MAX 650 TLC: MAX 60/TUBED: MAX 95 RF735-GKSK-P-B 700×35C 35-622 Black Black 420 TLC: MAX 400/TUBED: MAX 500 TLC: MAX 60/TUBED: MAX 70 RF735-GKSK-P-D 700×35C 35-622 Black Brown 420 TLC: MAX 400/TUBED: MAX 500 TLC: MAX 60/TUBED: MAX 70 RF738-GKSK-P-B 700×38C 40-622 Black Black 480 TLC: MAX 400/TUBED: MAX 525 TLC: MAX 60/TUBED: MAX 75 RF738-GKSK-P-D 700×38C 40-622 Black Brown 480 TLC: MAX 400/TU10 54-559 Black Black 610 MAX 350 MAX 50 RF2621-GKSK-P-D 26×2.10 54-559 Black Brown 610 MAX 350 MAX 50 RF650B48-GKSK-P-B 27.5×1.90(650B×48) 48-584 Black Black 600 MAX 350 MAX 50 RF650B48-GKSK-P-D 27.5×1.90(650B×48) 48-584 Black Brown 600 MAX 350 MAX 50 RF650B53-GKSK-P-B 27.5×2.10(650B×54) 54-584 Black Black 640 MAX 350 MAX 50 RF650B53-GKSK-P-D 27.5×2.10(650B×54) 54-584 Black Brown 640 MAX 350 MAX 50