topologies

Try every topology before you sign up.

Pick a front or rear axle, then its suspension, steering, actuation and anti-roll bar, and see the axle rebuild in 3D. Every option carries a badge for the lowest plan that includes it.

bellcrank's topology picker with the front axle and MacPherson strut suspension selected, each option badged with the lowest plan that includes it, and a 3D sketch of the resulting MacPherson front axle with a three-piece steering column and a U-bar anti-roll bar.
Live: pick options to rebuild the axle; drag to orbit, hover a hardpoint for its position. Live: tap options to rebuild the axle; drag with two fingers to orbit, pinch to zoom. Shown here as a still of its opening view.

On the free plan

7 templates, permanently free

  • Double wishbone, five-link and MacPherson suspension
  • Rack-and-pinion steering, two- or three-piece column
  • Coilover actuation
  • U-bar anti-roll bar

Pro, Teams and Student Teams

All 16 templates

Everything free, plus:

  • Trailing arm, two- and three-link control blade, and live axle, for rear axles
  • Damper, spring and push/pull-rod actuation, including the decoupled heave/roll layout
  • T-bar anti-roll bar

How the slots fit

The builder's own rules

A front axle takes double wishbone, five-link or MacPherson; trailing arm, control blades and live axle are rear-only, since nothing steers them. A MacPherson strut carries its own spring, so it takes no separate actuation, and a live axle has no anti-roll bar mounts. An axle takes up to three direct-acting units, or one push/pull-rod layout. The picker applies the same rules as the app's axle builder.

Start free

Solve something today.

Create an account, model a suspension from your own hardpoints, and run it on the rig. No download, no license, no payment details — and the free tier is permanent.

Create your free account Talk to us
  • No payment details
  • Nothing to install
  • Runs on any OS
  • Permanent free tier