Do you know if anyone has ever made any concave slope pieces? Looking for multiple lengths (2/3/4/5/6 stud lengths). Basically the opposite of this style: enter image description here

I would also be looking for the same concave shapes, which would go underneath, similar to this: enter image description here

The first example is a graduated curve, the bottom seems to be more of a constant curve. I would prefer graduated if possible, but in the concave direction, with the shallower slope at the bottom, steepening towards the top. If not, does anyone know anybody that makes custom shapes or pieces? enter image description here

  • For ready-made pieces, see the answers below. But you can also emulate a concave slope by combining straight slope pieces of different angles. Jul 2, 2020 at 10:15
  • Trying to avoid using any straight slopes at all. Wondering if anyone can custom make a piece.
    – Bruce West
    Jul 2, 2020 at 13:24

3 Answers 3


Part 18653 Brick, Arch 1 x 3 x 2 Inverted Part 18653 Brick, Arch 1 x 3 x 2 Inverted

Brick, Arch 1 x 5 x 4 Inverted Brick, Arch 1 x 5 x 4 Inverted

And a few other inverted arches

  • 18653 is close, but too tall. Hoping for more of a gradual slope for the edge chines.
    – Bruce West
    Jul 2, 2020 at 13:25

There's also these large pieces used in some Sports sets.

Sports Arena Section / Skateboard Ramp:

enter image description here

Sports Arena Section / Skateboard Ramp Corner

enter image description here


For the concave shapes that go underneath, there are a lot of bridges and archs from LEGO.

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