Crawler Geometry Tool
RC Crawler Geometry Tool
4-link · roll center · anti-squat · CG
How to:
① Pick your axle set and hit “Load axle base” — a generic starting point for that axle family, not your rig's real numbers.
② Enter your measurements: drag the link points and component boxes, or type exact values on the left.
③ Read the dots: green = typical range, amber = look twice — the Setup guide at the bottom explains every number.
④ Export saves your setup to a file to share; it also auto-saves in this browser.
Chassis
| Wheelbase | Tire Ø | Track width |
|---|---|---|
Coordinates: X from rear axle (forward +), Z from ground up, half-width from centerline.
Changing tire Ø raises/lowers the whole rig — mounts and components move with the axles.
Components / Weights
| Name | g | X | Z | Len |
|---|
Drag components in the side view. Len > 0 draws the part to scale (e.g. full-length C1 body); mass acts at its center — split a part in two if its weight is biased to one end. Typical chassis rails: carbon 3mm ≈ 90–130 g/pair, alu 2mm ≈ 150–200 g/pair, brass skid 150–400 g.
lower links
upper links
IC / force line
roll axis
CG
shock
Travel
ride