Journal · 12 MAY 2026 · 3 min read

Cutting a clean lip

The lip is where every jump is judged. Most of it is technique. Some of it is the tool.

The lip of a dirt jump is the last six inches before the takeoff. It's also the part that decides whether the jump tracks straight and feels right under wheel. If the lip is soft, you wash. If it's stepped, you get kicked sideways. If it's cupped, the jump feels like it grabs you. Everyone who builds knows this. Newer crews tend to think the rest of the jump matters more — the transition, the height, the run-up. Those matter. They don't matter as much as the lip.

I'm going to write down what I actually do, and where the tool shape changes the outcome.

Step one: dry shape, then wet

I never cut a final lip dry. Dry dirt won't hold an angle. You can scrape a profile that looks right, walk away, come back the next day after dew, and the whole top inch will have collapsed by half a degree. That half degree is the difference between a jump that feels poppy and one that feels dead.

So I rough-shape with the shovel dry, sometimes a day in advance. Then I water the top six inches — not soak, just enough that the surface goes from pale to dark — wait twenty minutes, and cut the final profile while the moisture is still in the top layer but the surface has set. This is the window where you can carve clean and the dirt holds.

Step two: the cut, not the scrape

The mistake I see most often is shoveling the lip like you're shoveling snow — pushing the blade across the surface. That removes material but leaves a fuzzy face. You can see the fibers of grass and root sticking out, and water will wick into those channels and erode them inside a week.

The cut is vertical. You drive the blade down into the lip from above, in three-inch overlapping bites, like you're slicing bread. The face you leave is the side of the blade, not the bottom. That face is smooth, sealed, and the angle is determined by how you hold the shaft, not by how you sweep.

This is why the blade geometry matters. A garden shovel has a rounded bottom edge — fine for scooping, terrible for slicing. You can't get a clean vertical cut with a round-tipped blade because the corner that's supposed to seal the bottom of the cut isn't there. The S13 has a square mouth with sharp 90-degree corners specifically for this. You drive it straight down, the corners do the seal, you lift, the face is glass.

Step three: tamp from above, never from the front

The other thing I never do is hit the lip face with a tamp. Tamping the face compresses the surface in the wrong direction — pushes the dirt back into the lip and creates a slight inward cup. That cup will catch your front wheel.

Tamp from the top, blade flat, working back from the edge in two-inch increments. You want the top compressed and the face left alone. The face is already sealed from the slicing cut. Touching it makes it worse.

What the tool does

I get asked sometimes whether the shovel really matters, or if it's just an excuse to charge more. Honest answer: the shovel matters for one specific thing, which is keeping the corners of the blade sharp and the face of the blade flat. A worn-down garden shovel with a beat-up edge will still move dirt, but it won't cut a clean lip, because the geometry that does the cutting is gone. The S13 has hardened steel at the working edge for the same reason a kitchen knife has hardened steel at the working edge. You want the angle to stay an angle.

That's the whole story. The technique does most of the work. The tool keeps the technique from compromising.