Caster angle — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/caster/  (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
- Caster is the side-view tilt of the steering axis. With positive caster the axis meets the road ahead of the contact patch, so the wheel trails and self-centres, improving directional stability (Wikipedia).
- More caster gives straight-line stability and camber gain when steering but heavier, less responsive steering (Wikipedia; Formula1-Dictionary). On RC cars, higher caster gives more stability and less off-power corner-entry steering (Tekno).
- Road cars commonly run over 7 deg with radial tyres; some F1 cars exceed 10 deg; RC buggies stack kick-up and caster-block angles to well over 20 deg.
- The file is a reference example built by Xem Studio from the numbers above (Reference 1/10 off-road: track 250 mm and 90 mm wheel+tyre (EFRA maxima); wheelbase illustrative.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle.

parameter  value or range  source
Road cars (radial tyres)  over 7 deg common  Wikipedia
F1  at least a few deg; some over 10 deg  Formula1-Dictionary
FSAE example  +2.923 deg front, mechanical trail 11.667 mm  Univ. of Utah FSAE
RC total caster example  11 deg kick-up + 0.5 deg insert + 15 deg block = 26.5 deg  Tekno setup guide
RC caster blocks (C-hub)  21, 18, 15 deg options  Adrenaline RC

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Caster angle — web — Publisher's page; dimensions are facts — https://en.wikipedia.org/wiki/Caster_angle
- Formula1-Dictionary: Castor angle — web — Publisher's page; dimensions are facts — https://formula1-dictionary.net/castor_angle.html
- University of Utah, Mechanical Engineering: Formula SAE Suspension System (senior design) — web — Publisher's page; dimensions are facts — https://mech.utah.edu/wp-content/uploads/2024/12/5-Formula-SAE-Suspension.pdf
- Tekno RC: Tekno RC Setup Guide — web — Publisher's page; dimensions are facts — https://teknoforums.com/misc/Tekno-RC-Setup-Guide.pdf
- Adrenaline RC Racing: Mastering Caster & Kick-Up for Better Offroad RC Racing Performance — web — Publisher's page; dimensions are facts — https://www.adrenalinercracing.com/blogs/news/mastering-caster-kick-up-for-better-offroad-rc-racing-performance

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