2025/2026 OTK Kart Setup Guide

2025/2026 OTK Kart Setup Guide

2025/2026 Homologation (Senior / Junior Chassis)

Chassis: Tony Kart · LN Kart · Kosmic · CS55 Categories: OK · TAG · KA100 · X30

1. Axle Selection

Axle Type Size Track Condition Notes
N 1030mm Normal Neutral balance and mixed-grip performance
N 1000mm Normal, lots of corners Shorter length for tight, corner-dense tracks
Q 1000mm High Grip Adds rear-end release
H 1000mm Low Grip Increases jack and rear grip

2. Rear Track Width

Track Condition Recommended Width
Low Grip 1385–1390 mm (pre-qualifying, cold)
High Grip 1390–1398 mm (race conditions)
Wet Weather Narrow as possible OTK Extended Hubs

3. Front Track Width

Track Condition Hubs Spacer Width
Normal 80mm 15 to 20mm
High Grip 80mm 15mm
Wet Weather 95mm Max Width all spacers inside

4. Front Stub Axle (HST4)

Track Condition Hole Result
Normal Middle Normal Steer
Normal Outer Calmer turn-in; reduced front-end bite
Wet Weather Inner Sharper turn-in; increased steering response

5. Chassis Ride Height

Rear Chassis Front Chassis Where To Use
Low Middle Base Setting
Low High Wet Weather
Low Low High Grip Circuit

6. Torsion Bar Selection

Bar Type Grip Level Result
OTK Oval Normal / Low Consistent, neutral flex
OTK Chrome Low Soft flex for added front compliance (Our Choice)
OTK Silver Medium Grip Balanced flex and steering response
OTK Gold High Grip Stiff flex for jack and corner release

Note: On very low-grip surfaces (e.g., VCS), some drivers may opt to remove the front bar altogether.

7. Camber | Castor

Track Condition Upper Pill Lower Pill Toe
Normal – Standard Baseline Setup Full Front (Neutral) Full Front (Standard) Neutral to 1-2mm Toe Out
Low grip circuits 2mm Neg Full Front (Standard) 1-2mm Toe Out
Wet Weather 2mm Pos Full Rear Positive 5-8mm Toe Out

Effects of Toe-In (Not used often)

  • Improves straight-line stability at high speed

  • Helps the front end self-centre under bumps

  • Promotes mild inner-shoulder tyre scrub for heat-up and even wear

  • Slows initial turn-in—overuse can feel sluggish

When to use toe-in

  • Fast, sweeping tracks where stability is key

  • Bumpy street-style circuit

Starting point: +1.0 mm total toe (+1 mm per side). Adjust in 1 mm increments.

Effects of Toe-Out

  • Sharpens initial turn-in and quickens response

  • Increases front-end bite in technical sections

  • May induce slight self-steer under lean

  • Can reduce high-speed stability

When to use toe-out

  • Tight, technical circuits

  • Races prioritising agility over straight stability

  • Warm, grippy surfaces

Starting point: −2.0 mm total toe (−1 mm per side). Adjust in 1 mm increments.

Quick Setup Tips

  • Combine toe with stub-axle hole selection: aggressive hole positions amplify toe effects

  • If turn-in feels dull, reduce toe-in or add toe-out

  • If kart wanders, dial in toe-in until stable

  • Log lap times and tyre wear with each change to pinpoint your range

8. Seat Positioning

  • Front lip of seat → front of floor tray: 650 mm

  • Centre of seat rib (flat) → axle centre: 160 mm

9. Tyre Pressures

Track Conditions Working Rear Others
Low Grip (VCS) 11 PSI 11.5 PSI
Standard 10 PSI 10.5 PSI
Wet Weather (Standing Water) 18 PSI 18.5 PSI
Very Slippery Wet 13 PSI 13.5 PSI
High Grip (AKC) 8 PSI 8.5 PSI

10. Baseline Setup Overview  - Where to start each weekend!

  • Chassis Ride Height: Rear low, Front middle

  • Stub Axle: Outer Hole, 1-2mm Toe Out, Neutral Caster. Starting on a completely neutral setting is advised when getting used to kart.

  • Seat: OTK seat with two seat stays brake side and adjustable seat stay, engine side. Seat position 650mm off front lip, seat level with chassis rails.

  • Torsion Bar: Flat style level or Round Chrome

  • Axle: N 1030mm or twisty circuit N 1000mm
  • Rear Track: 1390mm great starting Width
  • Front Spacers: 15mm inside, all others outside
  • Standard Wheel Hubs
  • Wheels: MXJ, switch to MXC on high grip, hotter or longer races
  • Tyre Pressure: 10.0 PSI Working, 10.5 PSI All others (LH03 Leconte)