Mix salt with chili powder to taste. Place in a small, shallow bowl.
Peel jicama. Rinse and cut into 1/4-inch-thick wedges or 1/2-inch-thick sticks 3 to 4 inches long.
Cut limes into wedges. Arrange jicama, limes, and chili salt on a platter.
To eat, rub jicama with lime, then dip in chili salt.