SuperNats 29

TBA

2027 Winter Series

TBA

2026 Pro Tour

12DAYS

SKUSA Mexico

33DAYS

2026 PKC

40DAYS

2026 TSRS

NOW!

Next SKUSA Pro Tour Event


PRE-ENTRY OPEN NOW
Late Registraton starts March 24
$250 Late/Walk-Up Fee 

Please follow our WhatsApp Channel
for class capacity updates.
PRO TOUR WINTERNATS - RNDS 1&2 March 27-29, 2026
Musselman Honda Circuit
11800 S Harrison Rd
Tucson, AZ 85747
(520) 245-5278
mhcircuit.com / Google Maps
No Weds practice. Unofficial Thursday practice run by SKUSA.
Do not ship packages to the track, ship to your hotel or hold for pickup with carrier.
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SKUSA Pro Tour
2026 Pro Tour Classes
PRo CLASSES
  • Push Back Bumpers - NOT REQUIRED for Pro Shifter or Pro X30
  • (2) Sets of Evinco Race Tires for each Event.
  • Pro X30 is moving back to the 300's
Pro Shifter
sponsored by PSL Karting
Engine: KZ 125cc
Age: 15+
Weight: 390 lbs
Tires: Evinco Red 'SK-M2' Spec from SKUSA
Kart # 1-99
Pro X30
sponsored by Nash Motorsportz
Engine: IAME X30
Age: 15+
Weight: 360 lbs
Tires: Evinco Red 'SK-M2' Spec from SKUSA
Kart # 301-399
 

SEMI-PRO CLASSES

  • Push Back Bumpers
    • Required for Micro/Mini Swift, KA100 Junior/Senior
    • NOT REQUIRED for X30 Junior or KA100 Master
  • Micro/Mini Swift - (1) Set of Evinco Race Tires Per 2-Round Weekend Allowed
  • All other Semi-Pro Clases - (2) Sets of Evinco Race Tires Per 2-Round Weekend Allowed
  • KA100 Master is CONFIMRED. Master Shifter needs 10 entries by March 13th. 
Micro Swift
sponsored by Groupo Santana Vega
Engine: IAME Mini Swift 60 + 16mm factory header
Age: 7-10
Weight: 220 lbs
Tires: Evinco Blue 'SK-H2' Spec from SKUSA
Additional Equipment: Neck brace & SFI-approved chestprotector required
Kart # 200-299
Mini Swift
sponsored by Mega Power Engines
Engine: IAME Mini Swift 60
Age: 9-13
Weight: 245 lbs
Tires: Evinco Blue 'SK-H2' Spec from SKUSA
Additional Equipment: Neck brace required; SFI-approved chest protector required for drivers 12 & under
Kart # 100-199
 
X30 Junior
sponsored by Rolison Performance Group
Engine: IAME X30 + 22.7mm factory header
Age: 12-15
Weight: 320 lbs
Tires: Evinco Blue 'SK-H2' Spec from SKUSA
Additional Equipment: Neck brace required; SFI-approved chest protector required for drivers 12 & under
Kart # 700-799
KA100 Junior
sponsored by TKG BIRELART USA.com
Engine: IAME KA100 + 22mm factory header
Age: 12-15
Weight: 320 lbs
Tires: Evinco Blue 'SK-H2' Spec from SKUSA
Additional Equipment: Neck brace required; SFI-approved chest protector required for drivers 12 & under
Kart # 800-899
 
KA100 Senior
sponsored by Kart CRG USA
Engine: IAME KA100
Age: 15+
Weight: 355 lbs
Tires: Evinco Blue 'SK-H2' Spec from SKUSA
Kart # 900-999
KA100 Master
Engine: IAME KA100
Age: 30+
21+ (200 lb racing weight of driver)
Weight: 390 lbs // 400 lbs (21+)
Tires: Evinco Blue 'SK-H2' Spec from SKUSA
Kart # 401-499
 
Master Shifter
Engine: IAME SSE 175cc / KZ 125cc
Age: 30+
Weight: 405 lbs
Tires: Evinco Red 'SK-M2' Spec from SKUSA
Kart # 600-699
 
 
We reserve the right to make additional modifications to our rules as experience dictates.
Last Updated on Monday, 09 March 2026 10:41