Semi-trailing arm suspension — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/semi-trailing-arm/  (sheet CC BY 4.0)
Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
Catalog version: 2026-10-20

Sizes: see table below
- A semi-trailing arm pivots on an axis inclined about 50-70 deg, mixing trailing-arm and swing-axle behaviour: the trailing part adds understeer, the transverse part adds roll oversteer, and the two largely cancel (AutoZine).
- Camber changes with wheel travel; it was common on older BMW, Mercedes and Porsche models before multi-link took over (AutoZine).
- Used on: BMW 3-Series (1982), Mercedes 560SEC, Porsche 911, Porsche 928 (Weissach axle).

parameter  value or range  source
Pivot axis inclination  about 50-70 deg  AutoZine

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- AutoZine Technical School: Suspension: trailing arm, semi-trailing arm, torsion beam, multi-link — web — Publisher's page; dimensions are facts — https://w.autozine.org/technical_school/suspension/tech_suspension21.htm

No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.
API: https://xemstudio.com/api/geometry?object=semi-trailing-arm