PLEASE NOTE: Every racer participating in an ISR sanctioned event must have an ISR ID number. To get one, you must register on the ISR website which you can get to by clicking here.
ISR APPROVED SPEC GAUGE
If you have questions about snowmobile racing rules, please contact the ISR.
International Snowmobile Racing, Inc.
1527 N Railroad Street.
Eagle River, WI 54521
Office Phone: 262-335-2401
Email: Email ISR through the Contact Us tab on the ISR website