Green number 4 dirt modified on track at night

Circle track

RACING PARTS

Parts for circle track cars. Each one started as something we needed on our own car and got raced before it went up for sale.

All Accessories Interior Engine

Engine

4412 Carb Offset Spacer

$100.00$130.00

FREE SETUP TOOLS

Suspension calculators that run in your browser. No account, no upload.

4-link calculator showing anti-squat, roll center, and a 3D view of the rear links

Triangulated 4-Link Calculator

Full 3D kinematic solver for triangulated 4-link rear suspensions. Enter your link measurements and instantly see anti-squat, roll center, rear steer, and roll articulation — with interactive 3D, side, rear, and top views.

Suspension builder replaying a lap with a 3D front end and camber and toe charts

Double-Wishbone Suspension Simulator

Constrained-kinematics solver for SLA front suspensions. Independent left/right geometry, hardpoint editor, per-corner travel control, Ackermann, roll center migration, and bump steer.