VehiclesTamiya WR-02CB

Tamiya WR-02CB Chassis

Name: Tamiya WR-02CB
Brand: Tamiya

1/10 scale · 2WD chassis · sold as kits

Tamiya's WR-02CB is the comical buggy version of the WR-02, a 1/10 rear-drive chassis sold as the Comical Grasshopper, Comical Hornet and Comical Mighty Frog kits.

Tamiya prints 18.3:1 on the kit's 18T pinion and 16.5:1 on an optional 20T, and does not publish the spur or the gear train behind them, so the pinion and those totals are the only gearing figures. The wheelbase is 170 mm. The pinion, motor and tires come with each kit rather than with the chassis, so enter yours in the gearing tool.

Final drive: 16.50 to 18.30:1on 20T to 18T
Wheelbase: 170mm
Introduced: 2018

Gearing Top speedsourced

The pinion, motor and tires come with each kit: enter yours in the gearing tool.

Tamiya WR-02CB — Photo: Tamiya (opens in a new tab)

Kits on this chassis Built on the WR-02CB

Each kit adds its own body, tires, pinion and motor. The chassis figures below apply to all of them.

Kit	Part no.	Maker page
Comical Mighty Frog	58673	tamiya.comPage (opens in a new tab)
Comical Hornet	58666	tamiya.comPage (opens in a new tab)
Comical Grasshopper	58662	tamiya.comPage (opens in a new tab)

Specifications

Last modified Sep 28, 2026

Spec	Value	Basis
Vehicle
Drive Only one axle is driven, the rear on almost every 2WD RC car. It is lighter and simpler, and it takes more throttle control on loose ground. Build A kit you build yourself from parts. Most kits come without motor, ESC, servo, radio and battery, and many without tires or a painted body. The manual lists what to add. Scale The maker's nominal size compared with a full-size vehicle. It works more as a class label than a measurement. A 1/10 monster truck is far bigger than a 1/10 touring car, so compare length and weight for real size.
Drive	2WD
Build	Kit
Scale	1/10
Drivetrain
Pinion The small gear on the motor shaft. Fewer teeth gear the car shorter: quicker acceleration, lower top speed and a cooler motor. More teeth do the opposite. On a chassis sold as kits, each kit brings its own. Spur The large gear the pinion drives. A bigger spur with the same pinion gears the car shorter. Pinion and spur must have the same pitch, or tooth size, to mesh. Transmission & axle Every reduction after the spur, multiplied together: transmission, differentials and axle gears. It is fixed by the design; the gearing you change is the pinion and spur. Final drive, printed How many times the motor turns for one turn of the wheels. A higher number is shorter gearing: more acceleration and pulling power, less top speed.
Pinion	With each kit
Spur	Not published
Transmission & axle	Not published
Final drive, printed	18.30:1 on 18T, 16.50:1 on 20TMaker's chart	Maker's chart
Wheels & tires
Tire diameter The outside diameter of the mounted tire, tread to tread. A taller tire covers more ground each turn, which gears the car taller. At high speed tires can balloon and grow, so the real gearing gets taller as the car goes faster.
Tire diameter	With each kit
Power
Motor Motor KV is the RPM a motor turns per volt with no load. This vehicle comes without a motor, so there is no stock KV; it depends on the one you fit. Battery The highest LiPo cell count the maker rates the electronics for. This vehicle comes without electronics, so it depends on the ESC and motor you fit.
Motor	With each kit
Battery	With each kit
Size & weight
Wheelbase The distance between the front and rear axle centers. A longer wheelbase is steadier at speed and over bumps; a shorter one turns more tightly.
Wheelbase	170 mm6.7 inStock	Stock

How to read these figures

Stock is as the vehicle ships.
Calculated is worked from the stock figures on this page rather than stored beside them, so the two cannot drift apart.
Not published means it exists but no source we could find prints it.
With each kit means each kit on this chassis brings its own, so enter yours in the gearing tool.
Maker’s chart is the ratios the maker prints for this chassis with the pinions it names.

Other versions of this chassis

How these numbers were settled

The WR-02CB is the WR-02 gearbox under Tamiya's Comical buggy bodies, with CVA oil dampers.

The kits come with the gearbox built and the motor fitted; Tamiya publishes neither the spur tooth count nor the ratio of the gear train after it.
The Comical Grasshopper manual's maintenance pages (58662.pdf p. 18) print '18T 18.3:1' (included in kit) and '20T 16.5:1', and all three kit pages print 'ギヤレシオ＝1:18.3' and a 170mm wheelbase.
Pinion and total are the only gearing facts.
All three kits are standard products in Tamiya's status file; the XB built-up versions (57908, 57909, 57915) are left off.
The pinion, motor and tires come with each kit, so they are not part of the chassis figures: enter yours in the gearing tool.

Sources

Every figure on this page traces to one of these; where they disagreed, the note above says which was used and why. Links open in a new tab.

Maker documents

Comical Grasshopper (WR-02CB) instruction manual (Tamiya PDF) (opens in a new tab)Gearbox maintenance and options table 18T 18.3:1, 20T 16.5:1, p. 18d7z22c0gz59ng.cloudfront.netUsed forMain specs

Parts and electronics

Product info EX (opens in a new tab)tamiya.comUsed forMain specs
Products 58662 (opens in a new tab)tamiya.comUsed forMain specsSize
Products 58666 (opens in a new tab)tamiya.comUsed forMain specsSize
Products 58673 (opens in a new tab)tamiya.comUsed forMain specsSize
Std.csv (opens in a new tab)tamiya.comUsed forMain specs

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