Class Rules & Regulations
The Ohio Sprint Series (OSS) abides by the National Karting Alliance (NKA) ruleset that can be found in the links below. Furthermore, supplemental rules specific to the OSS are below as well. Should any rule in the OSS rule supplements conflict with anything in the NKA rulebook, the OSS rules will take precedence. All engine specific rules can be found via links to the corresponding manufacturers websites.
For quick reference, the table below displays each class being run, along with the corresponding minimum weights and tire specifications.
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Class
T225 Tillotson Masters
T225 Tillotson Senior
T225 Tillotson Junior
206 Masters
206 Senior
206 Junior
206 Sportsman
IAME 100cc Senior
IAME 100cc Junior
IAME 60cc Mini Swift
IAME 100cc Masters
Rotax 125 Senior
Rotax 125 Junior
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Weight
390lbs
360lbs
320lbs
390lbs
360lbs
320lbs
255lbs
360lbs
320lbs
250lbs
390lbs
360lbs
320lbs
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Tire Specs/Carb
T4 Spec 4.5/7.1 Tire
T4 Spec 4.5/7.1 Tire
T4 Spec 4.5/7.1 Tire
MOJO D2 4.5/7.1 Tire/Black Slide
MOJO D2 4.5/7.1 Tire/Black Slide
MOJO D2 4.5/7.1 Tire/Yellow Slide
MOJO D2 4.5/4.5 Tire/Red Slide
MG SH RED 4.6/7.1 Tire
MG SH RED 4.6/7.1 Tire
MG SH RED 4.6/7.1 Tire
MG SH RED 4.6/7.1 Tire
MOJO D2 4.5/7.1 Tire
MOJO D2 4.5/7.1 Tire