2026 Season Complete Champions Crowned 2027 Calendar Announced USPKS × ROK Cup USA Partnership From 2027 Live Timing by MYLAPS Speedhive

2026 Class structure

Eleven classes.
One ladder.

From a first cadet season at seven years old to the X30 Pro and Pro Shifter grids. Find your rung, check the spec, and register.

Register on RaceSelectRules & fichesAwards & prize fund
Classes
11
Engine platforms
4
Tires
MG
Youngest entry
7 yrs

01 The ladder

Where you start is set by age.
Where you finish is up to you.

01IAME Swift

02IAME KA100

03IAME X30

04Shifter

Super Master classes run on track with their Master class and are scored separately as well as with it. KA100 Super Master runs with KA100 Master; Shifter Super Master runs with Shifter Master.

02 By category

Four engine platforms

01 IAME Swift

IAME Swift

The cadet classes. IAME Swift 60cc on a cadet chassis with cadet bodywork, for drivers from 7 to 11.

02 IAME KA100

IAME KA100

The 100cc IAME KA100 package, from Junior at 12 through Senior, Master and Super Master.

03 IAME X30

IAME X30

The IAME X30 in Junior trim at 12 to 15, and the X30 Pro headline class from 15 and up.

04 Shifter

Shifter

Gearbox karts on KZ or Rok Shifter engines: Pro Shifter from 15, Shifter Master from 30, Super Master from 45.

03 Spec sheet

Compare the numbers

Engine fiches & rulebook
Class specifications: age, engine, carburetor, tires and minimum weight
Engine Carburetor
IAME Micro Swift 7–10 years old IAME Swift 60cc with factory 16mm header, factory airbox Tillotson HW-31A MG "SH2" Red 4.60 / 7.10 (1 Set) 225 lbs
IAME Mini Swift 8–11 years old IAME Swift 60cc, factory airbox Tillotson HW-31A MG "SH2" Red 4.60 / 7.10 (1 Set) 245 lbs
IAME KA100 Junior 12–15 years old IAME KA100 with factory 22mm header, factory airbox Tillotson HW-33A MG "SH2" Red 4.60 / 7.10 (2 Sets) 320 lbs
IAME KA100 Senior 15+ years old IAME KA100, factory airbox Tillotson HW-33A MG "SH2" Red 4.60 / 7.10 (2 Sets) 360 lbs
IAME KA100 Master 30+ years old IAME KA100, factory airbox Tillotson HW-33A MG "SH2" Red 4.60 / 7.10 (1 Set) 385 lbs
IAME KA100 Super MasterRuns with Master 45+ years old IAME KA100 with factory airbox Tillotson HW-33A MG "SH2" Red 4.60 / 7.10 (1 Set) 385 lbs
IAME X30 Junior 12–15 years old IAME X30 with factory 22.7mm header, factory airbox Tillotson HW-27A MG "SH2" Red 4.60 / 7.10 (2 Sets) 320 lbs
IAME X30 Pro 15+ years old IAME X30, factory airbox Tillotson HW-27A MG "SM2" Yellow 4.60 / 7.10 (2 Sets) 365 lbs
Pro Shifter 15+ years old KZ or Rok Shifter Tillotson HB-15A or Dellorto VHSH30 MG "SM2" Yellow 4.60 / 7.10 (2 Sets) 395 lbs (KZ) / 380 lbs (Rok)
Shifter Master 30+ years old KZ or Rok Shifter Tillotson HB-15A or Dellorto VHSH30 MG "SM2" Yellow 4.60 / 7.10 (2 Sets) 410 lbs (KZ) / 395 lbs (Rok)
Shifter Super MasterRuns with Master 45+ years old KZ or Rok Shifter Tillotson HB-15A or Dellorto VHSH30 MG "SM2" Yellow 4.60 / 7.10 (2 Sets) 410 lbs (KZ) / 395 lbs (Rok)

Showing 11 of 11 classes

Specifications as published in the USPKS class structure. The 2026 USPKS Rulebook governs where anything differs.

Registration

Pick your class. Take the grid.

Entries for every class are handled on RaceSelect. Membership and reserved numbers are tracked per driver.

Register on RaceSelect