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Shock angle and mounting position

How does shock angle affect an RC car? · Standard part · basis: Design rules and figures from the cited sources; example geometry by Xem Studio

Also called: shock angle, shock mounting position, laid down shocks, shock tower holes, shock lean, rc shock position, progressive damping, shock motion ratio, outer shock position

Exact dimensions. True size, with no printing tolerance added.

sizes
3 in table

Notes

  • Leaning a shock over reduces its effective rate at the wheel at first and makes it rise through the travel. Tekno: more lean gives softer initial damping, more progressive damping and more side traction; less lean gives harder, more linear damping and a more responsive car.
  • CompetitionX notes that increasing the angle on the shock mount locations reduces understeer and improves bump handling.

Shock angle and mounting position size chart

parametervalue or rangesource
More leansofter initial, more progressive, more side tractionTekno setup guide
Less leanharder, linear, more responsiveTekno setup guide
More angleless understeer, better bumpsCompetitionX quick guide

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Tekno RCTekno RC Setup GuidewebPublisher's page; dimensions are facts
CompetitionXRC Quick Setup GuidewebPublisher's page; dimensions are facts

Xem scan

File coming

No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.

Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.
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Plain text: sheet.txt · JSON: /api/geometry?object=shock-angle

Schematic, not to scale.

Fits with

Camber angle, isometric render of a generated part
Camber angle4 sizes★ 1 file
Caster angle, isometric render of a generated part
Caster angle5 sizes★ 1 file
Front kick-up (RC), isometric render of a generated part
Front kick-up (RC)4 sizes★ 1 file
Front toe (toe-in / toe-out), isometric render of a generated part
Front toe (toe-in / toe-out)3 sizes★ 1 file
Rear toe-in, isometric render of a generated part
Rear toe-in3 sizes★ 1 file
Ackermann steering geometry, isometric render of a generated part
Ackermann steering geometry4 sizes★ 1 file

Questions

Why is it progressive?

As the arm rises a leaned shock straightens, so its effective rate increases (Tekno describes the progressive feel).