What each race class means, what's allowed, and where to start.
·Chris·1 min read·
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Class tech sheets
Tap a class for its InterClub tech sheet — tap any row for what the rule means and why it matters.
Must also conform with Weight, Dimension & Body for All Classes, and Tyre & Body Rules (see Also applies).
Must also conform with Weight, Dimension & Body for All Classes, and Tyre & Body Rules (see Also applies).
Must also conform with Weight, Dimension & Body for All Classes, and Tyre & Body Rules (see Also applies).
Must also conform with Weight, Dimension & Body for All Classes, and Tyre & Body Rules (see Also applies).
Must also conform with Weight, Dimension & Body for All Classes, and Tyre & Body Rules (see Also applies).
Must also conform with Weight, Dimension & Body for All Classes, and Tyre & Body Rules (see Also applies).
Driver runs Box Stock rules at half speed (usually a throttle limit on the radio).
Must also conform with Weight, Dimension & Body for All Classes, and Tyre & Body Rules (see Also applies).
Also applies
Weight, dimension & body (all classes)
Wheels and tyres must fit inside the body
Unmodified Kyosho ASC bodies are exempt from body dimension restrictions
Touring classes: wheelbase 86–102mm; max length 180mm (Open max width 85mm / wing 50mm; others max width 80mm / wing 45mm)
F1: wheelbase 112–116mm (Kyosho MF01 allowed); original body length/width/height
AAA Stock & 2500 Lipo: minimum weight 160g
3D printed / non-commercial bodies and fully printed chassis subject to admin approval
Tyre & body rules
Tyre width must match wheel width
Any 1/28 branded production rubber tyres — no homemade, foam, silicon, or urethane
No traction compounds; tyre truing allowed; clean with alcohol, water, or residue-free tape
Headlights required at race start (decal/tape if reinstall fails); rear lights optional
Limited ground-clearance mods; internal fender clearance cuts OK
Decorative catch-prone parts may be omitted; rear bumper may be removed up to 20mm from ground
No barrier rollers; bodies must be identifiable as cars (not damage-oriented designs)
Class specifications are taken from the Australian 1/28 Onroad InterClub Rules V1.0 (Jan 2026).
Which class should I choose?
Situation
Recommendation
First time racing
Box Stock, or Driver if you want half-speed stock
Junior or learning race format
Driver (half-speed box stock), then Box Stock
Have a stock RTR car
Box Stock or Driver
Want to tinker and tune
2WD Open or AWD Open
Building for AAA, 2500, or F1
Check the event class list and the tech sheets above
Not sure
Start Box Stock or Driver, move up when you’re ready
There’s no pressure to move up. Box Stock is competitive and fun at every skill level. Some of our quickest drivers still race Box Stock by choice.
Class rules on race weekend
On a race weekend the banners and flight cases might be smaller, but the cadence is the same DNA: short heats, a driver’s stand, marshals at the tiles, and everyone sharing the same surface between the barriers — whether you are in Box Stock, chasing an Open, AAA, or 2500 main, or lining up in F1.
Classes are called in order. You can enter multiple classes if you have the cars for it. Meet-night software is RC-Clubs, with EasyLap transponders counting laps through the timing bridge.