1/28 On-Road Open (28SRA) Rules
v1Summary of recent changes
Published from nimrc.club/classes.
Spec sheet
- Notes
- 2S LiPo or paralleled 1-cells; gearing open; tire warmers allowed; no traction compound/homemade tires/foam/inserts; gyro prohibited; 3D-printed parts ok
- Motor type
- Open
- Spec motor
- Any manufacturer, max 16mm can diameter
- ESC
- Any, sensored or sensorless
- Battery chemistry
- LiPo
- Cells
- 2S
- Max voltage
- 8.40V
- Spec tire
- Any 1/28 production; front max 11mm, rear max 14mm, dia 19-20.5mm
- Tire additive
- Banned
- Body
- Approved list (PN, SBRC, Marka, Atomic, GL, etc.), wings max 50mm
- Chassis
- Kyosho MR03 RWD / Jomurema / GLR / MRC / PN / Atomic / NEXX etc., wheelbase 94/98/102mm
1.Chassis
Kyosho MR03S/MR03S2/MR03 RWD, Jomurema, GL Racing GLR series, MRC MR01, PN PNR2.5W/PNR3.0, RTRC RTA, Atomic MRZ/MRX/MRV/RX28 series, NEXX Skyline/Specter, MWX R.1, G-Force Lightning, XBility XB1, or AE RC28. Wheelbase 94, 98, or 102mm.
2.Motor & gearing
Any manufacturer motor — max 16mm can diameter. Gearing open.
3.Wheels & tires
Any 1/28 production wheels — front max 11mm, rear max 14mm, diameter 19–20.5mm. NO traction compound, homemade tires, foam, silicone, urethane, ethyl carbamate, or inserts. Tire warmers allowed.
4.Batteries
2-cell LiPo or paralleled 1-cells, 8.4V max. One additional battery for the transponder.
5.ESC / receiver
Any manufacturer, sensored or sensorless. Receivers with built-in gyro, or separate gyros, prohibited.
6.Body
Approved body list: PN, SBRC, Marka, Atomic, GL Racing, Rad Body, PROTOform, G-Force, RTRC, Bitty Designs, and Nexx Racing models. Wings limited to 50mm height.
7.Option parts
Any factory, aftermarket production, or 3D-printed parts allowed; weight additions permitted. Prototypes prohibited — public availability 45 days prior; 3D files 45 days before the event.