SuperNats 29

TBA

2027 Winter Series

TBA

2026 Pro Tour

73DAYS

SKUSA Mexico

17DAYS

2026 PKC

24DAYS

2026 TSRS

31DAYS

Next ProKart Challenge Event

PRE-ENTRY OPENS APRIL 3

PKC Rounds 1/2 - K1 Circuit April 24-26, 2026
K1 Circuit
32240 Grand Ave
Winchester, CA 92596
k1circuit.com
Google Maps
There will be a Sunoco vendor pumping fuel.
There is no camping at this facility.
  • Pit Passes
  • Pit Spot Reservations
  • Event Schedule
  • Track Map // Pit-Map
  • Info Sheet // Tech Sheet
  • Event & Series Prizes

California ProKart Challenge

2026 ProKart Challenge Classes
  • Spec Fuel/Oil for all classes:  Sunoco 112 Supreme / Elf HTX909
  • Push back bumper will not be required for any classes of the 2026 Pro Kart Challenge.
  • (1) Set of 2026 PKC Stamped Evinco Race Tires per round allowed. Sticker tires are recommended for each round, but not required (used tires ok if they have 2026 PKC stamp).

IAME SWIFT CLASSES

Micro Swift
Engine: IAME Mini Swift 60 + 16mm factory header
Age: 7-10
Weight: 220 lbs
Tires: Evinco Blue 'SK-H2' from SKUSA
Additional Equipment: Neck brace & SFI-approved chestprotector required
Kart # 200-299
Mini Swift
Engine: IAME Mini Swift 60
Age: 9-13
Weight: 245 lbs
Tires: Evinco Blue 'SK-H2' from SKUSA
Additional Equipment: Neck brace required; SFI-approved chest protector required for drivers 12 & under
Kart # 100-199
 

IAME KA100 Classes

KA100 Junior
Engine: IAME KA100 + 22mm factory header
Age: 12-15
Weight: 320 lbs
Tires: Evinco Blue 'SK-H2' from SKUSA
Additional Equipment: Neck brace required; SFI-approved chest protector required for drivers 12 & under
Kart # 800-899
KA100 Senior
Engine: IAME KA100
Age: 15+
Weight: 355 lbs
Tires: Evinco Blue 'SK-H2' from SKUSA
Kart # 900-999


 
KA100 Master
Engine: IAME KA100
Age: 30+
21-29 (200 lb racing weight of driver)
Weight: 390 lbs // 400 lbs (21+)
Tires: Evinco Blue 'SK-H2' from SKUSA
Kart # 400-499
 

SSE/KZ CLASSES

Pro Shifter
Engine: SSE/KZ
Age: 15+
Weight: 390 lbs
Tires: Evinco Red 'SK-M2' from SKUSA
Kart # 1-99
Master Shifter
Engine: SSE/KZ
Age: 30+
Weight: 405 lbs
Tires: Evinco Red 'SK-M2' from SKUSA
Kart # 600-699
 

LOCAL OPTIONS CLASSES

  • *Spec Honda and Rok Shifters can race in the FZ125 Spec Shifter class using Evinco Blues at 390lbs.  Once we have a better picture of the Honda/RoK landscape, we can make any necessary adjustments.
Mini Shifter
Engine: FZ65
Age: 9-13
Weight: 255 lbs
Tires: Evinco Blue 'SK-H2' from SKUSA
Additional Equipment: Neck brace required; SFI-approved chest protector required for drivers 12 & under
Kart # 700-799
Junior Shifter
Engine: FZ85
Age: 12-15
Weight: 340 lbs
Tires: Evinco Blue 'SK-H2' from SKUSA
Additional Equipment: Neck brace required; SFI-approved chest protector required for drivers 12 & under
Kart # 500-599
FZ125 Spec Shifter
Engine: FZ125
Spec Honda/RoK Shifter
(See note above)
Age: 15+
Weight: 390 lbs
Tires: Evinco Blue 'SK-H2' from SKUSA
Kart # 300-399
FZ125 Master Shifter
Engine: FZ125
Spec Honda/RoK Shifter
(See note above)
Age: 30+
Weight: 405 lbs
Tires: Evinco Blue 'SK-H2' from SKUSA
Kart # 400-499
 
We reserve the right to make additional modifications to our rules as experience dictates.