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Set ramp shape and lumber options to get a build diagram and cut list.

Ramp configuration

Units

Ramp shape

Height
cm

Vertical distance to the lip

Lip angle
°
Flat lip
cm

Structure

Width
cm

Surface width — 4 ft (122 cm) is typical

Side depth
cm

Radial depth of curved side panels

Surface

2×4 boards run across the width, stacked along the surface

Board gap
cm

Distance between 2×4 edges · pitch 9.9 cm

Results

Overlays
45°radius 4.10 m1.20 m1.22 mboard gap 1.0 cm2.90 mside depth 30.5 cm

Scale reference

Bike
Rider height
cm
Show bike on ramp

1.70 m end-to-end

Side elevation45°radius 4.10 m1.20 m2.90 mside depth 30.5 cm1.85 m26″ wheel66.0 cm

Radius 4.10 m is mellower than the typical 8–13 ft (2.4–4.0 m) window for this bike — expect a softer take-off.

Cut list

Side cutouts

One side: A + B

depth 30.5 cmradius 4.10 m
A1.61 mB1.61 m
  • ACurved side blankarc 1.61 m · 30.5 cm deep · blank 1.72 m × 38.4 cm×2
  • BCurved side blankarc 1.61 m · 30.5 cm deep · blank 1.72 m × 38.4 cm×2
  • CConnector plate (inside face)30.0 cm × 30.5 cm×2
Sheet 1 of 2A ×2 · B ×1 · C ×2
AABCC2.44 m1.22 m
Sheet 2 of 2B ×1
B2.44 m1.22 m1.72 m38.4 cm

Mark both curves of each blank from one centre point: riding edge radius 4.10 m, back edge radius 4.40 m.

  • SDeck board1.22 m × 8.9 cm×32
Sticks 1–16 of 16S ×2 each
S · 1.22 m × 8.9 cmS · 1.22 m × 8.9 cm2.44 m1.22 m
  • VVertical back post1.20 m × 8.9 cm×2
  • FFloor runner2.90 m × 8.9 cm×2
  • DDiagonal brace (cut ends to fit)85.5 cm × 8.9 cm×2
  • HTop cross tie1.18 m × 8.9 cm×1
  • BBottom cross tie (between posts)1.18 m × 8.9 cm×1
  • XBack cross brace (diagonal)1.35 m × 8.9 cm×1
Sticks 1–2 of 6exceeds one stick — splice
F — not to scale2.90 m2.44 m
Stick 3 of 6D ×1 · X ×1
X · 1.35 m × 8.9 cmD · 85.5 cm × 8.9 cm2.44 m
Stick 4 of 6V ×2
V · 1.20 m × 8.9 cmV · 1.20 m × 8.9 cm2.44 m1.20 m
Stick 5 of 6B ×1 · H ×1
H · 1.18 m × 8.9 cmB · 1.18 m × 8.9 cm2.44 m
Stick 6 of 6D ×1
D · 85.5 cm × 8.9 cm2.44 m85.5 cm