In a small bowl, combine the lime juice, red pepper flakes, chili powder, vinegar, sugar and olive oil. Season with 1 teaspoon each salt and pepper and whisk to combine.
Combine the jicama, carrots, cabbage, red onion, cucumber, bell pepper and cilantro in a large bowl and toss.
Add the dressing to the vegetables. Let sit 15 minutes, stirring 2 or 3 times.
Photograph by Ryan Dausch