Front splitter — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/front-splitter/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
Catalog version: 2026-10-20

Sizes: see table below
- A splitter is a horizontal plate at the bottom of the front bumper: air stagnates on top while the underside, close to the ground, runs at low pressure, so it produces front downforce very drag-efficiently (HPA).
- Because it works in ground effect it is very ride-height sensitive; HPA suggests a ~70 mm static height and not below ~60 mm on club cars, and a rounded leading edge (at least 10 mm radius, 40 mm preferred).
- Overhang should match the rear wing so the car stays balanced: ~100 mm for a 200-300 hp single-element car up to 200-300 mm for 1000+ hp cars (HPA).
- Used on: Touring and time-attack cars (HPA).
- The file is a reference example built by Xem Studio from the numbers above (150 mm overhang (HPA 500-600 hp tier); width illustrative car width.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle.

parameter  value or range  source
Overhang, 200-300 hp, single-element wing  up to ~100 mm  HPA splitter
Overhang, 500-600 hp, dual-element wing  150-200 mm front, 100-150 mm side  HPA splitter
Overhang, 1000+ hp  200-300 mm front, ~200 mm side  HPA splitter
Static height target  ~70 mm; avoid below 60 mm on club cars  HPA splitter
Leading-edge radius  >=10 mm, 40 mm preferred (bottom radius matters most)  HPA splitter
Splitter endplates  about 100-150 mm tall  HPA splitter
Downforce increment (Katz & Cain)  dCL about -0.10 with dCD < 0.02  Cranfield / SAE 2018-01-0725
Model splitter sizes tested (35% scale)  6-41 mm  Cranfield / SAE 2018-01-0725

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- High Performance Academy: Aerodynamic performance devices for club level cars: front splitters — web — Publisher's page; dimensions are facts — https://www.hpacademy.com/courses/aerodynamics-fundamentals/aerodynamic-performance-devices-for-club-level-cars-front-splitters
- Cranfield University / SAE: On the Aerodynamics of an Enclosed-Wheel Racing Car (Soares et al., SAE 2018-01-0725) — web — Publisher's page; dimensions are facts — https://dspace.lib.cranfield.ac.uk/server/api/core/bitstreams/9b476386-44d0-4c0f-a49e-c3372274d351/content

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/front-splitter/index.json
API: https://xemstudio.com/api/geometry?object=front-splitter