SuperNats 29

183DAYS

2027 Winter Series

248DAYS

2026 Pro Tour

31DAYS

SKUSA Mexico

17DAYS

2026 PKC

11DAYS

2026 TSRS

38DAYS

Next ProKart Challenge Event


PRE-ENTRY OPEN UNTIL MAY 20
You can still register online but
$25 Late/Walk-up fee applies.
PKC Round 3 - SONOMA RACEWAY May 23-24, 2026
Sonoma Raceway Karting Center
29355 Arnold Dr,
Sonoma, CA 95476
sonomaraceway.com
Google Maps
There will be a Sunoco vendor pumping fuel.

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
sponsored by Parazinho Chassis Jig
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
sponsored by Formula Works/GFC
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
sponsored by Nash Motorsportz
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
sponsored by Hayner Racing Team
Engine: IAME KA100
Age: 15+
Weight: 355 lbs
Tires: Evinco Blue 'SK-H2' from SKUSA
Kart # 900-999


 
KA100 Master
sponsored by Precision Karting
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
sponsored by Axis Kartsport
Engine: SSE/KZ
Age: 15+
Weight: 390 lbs
Tires: Evinco Red 'SK-M2' from SKUSA
Kart # 1-99
Master Shifter
sponsored by Leading Edge Motorsports
Engine: SSE/KZ
Age: 30+
Weight: 405 lbs
Tires: Evinco Red 'SK-M2' from SKUSA
Kart # 600-699
 

LOCAL OPTIONS CLASSES

  • Due to parity challenges with the RoK engines, they are no longer allowed. Honda CR125's are still allowed in FZ125 Master Shifter at 415lbs.
  • Please contact This e-mail address is being protected from spambots. You need JavaScript enabled to view it  to inquire about FZ Engine Lease specials and promotions.
Mini Shifter
sponsored by Empire Karts
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
sponsored by West Coast Motorsports
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
sponsored by P1 Engines Inc
Engine: FZ125
Age: 15+
Weight: 390 lbs
Tires: Evinco Blue 'SK-H2' from SKUSA
Kart # 300-399
FZ125 Master Shifter
sponsored by Precision Works Racing
Engine: FZ125
Spec Honda (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.