BROOKS. 120274.091. CASCADIA 13. GREY PINK.Slap on the knobby tires and lock the differentials because the Brooks Cascadia 13 is going off road. The newest version in Brooks four-wheel-drive line was streamlined to shave some weight but it still boasts a rock shield to protect your undercarriage and burly traction to keep you right-side up through even the gnarliest boulder field.