Head tube angle is the angle of the front tube relative to the ground, and it shapes how your gravel bike steers and feels. Steeper angles (closer to vertical) make the steering quicker and more responsive, while slacker angles (more laid-back) add stability at speed and on rough descents.
For most gravel riders, 71–72° is the sweet spot, giving you a nice balance between quick handling and off-road confidence. If you're leaning toward racing or faster group rides on smoother gravel, look for steeper angles around 72–73°. Prefer bikepacking adventures or tackling chunky, technical terrain? A slacker angle in the 69–71° range will feel more planted and stable.
One important note: don't judge head angle alone. The trail measurement—affected by your fork offset—works hand-in-hand with head angle to determine steering feel. And while slacker sounds better for off-road, going too slack can make climbing feel sluggish and vague.