VehiclesTamiya BB-01

Tamiya BB-01 Chassis

Name: Tamiya BB-01
Brand: Tamiya

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

Tamiya's BB-01 is a 1/10 rear-wheel-drive buggy chassis built from a kit, with a lower deck, a roll cage and a ball differential, sold under the BBX body.

It pairs an 86T spur in 48 pitch with a 2.60:1 gearbox stage on a 283 mm wheelbase. Because every kit shares that stage, the pinion you fit decides the gearing. The pinion, motor and tires come with each kit rather than with the chassis, so enter yours in the gearing tool to see the final drive and rollout for your setup.

Transmission & axle: 2.60:1
Spur: 86T
Wheelbase: 283mm
Introduced: 2023

Gearing Top speedsourced

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

Tamiya BB-01 — Photo: Tamiya (opens in a new tab)

Kits on this chassis Built on the BB-01

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

Kit	Part no.	Maker page
BBX	58719	tamiya.comPage (opens in a new tab)

Specifications

Last modified Sep 28, 2026

Spec	Value	Basis
Vehicle
Class The kind of vehicle the maker sells it as. It sets what the car is built to do and which cars it is fair to compare it with. Buggies are low, light off-road cars built for jumps and fast corners on dirt, clay or turf tracks. 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.
Class	Buggy
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. The Gearing parts table below shows this car's pitch and part numbers. 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. This one is worked out from the tooth counts the maker publishes. Final drive 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	86TStock	Stock
Transmission & axle	2.60:1Derived	Derived
Final drive	With each kit
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. Race tires wear down over a day, and a smaller tire gears the car shorter.
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	283 mm11.1 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.
Derived is worked out from gear tooth counts the maker publishes rather than printed as a ratio; the notes below say how.
With each kit means each kit on this chassis brings its own, so enter yours in the gearing tool.

Gearing parts

Pinion and spur parts for the Tamiya BB-01: fitted, and optional gearing supplied in the box
Component	Teeth	Pitch	Bore	Part number
Fitted at the factory
Spur	86T	48P	Not applicable	51714 (opens in a new tab)

About teeth, pitch and bore

Tooth counts are the ones in the specifications above.
Pitch is given as metric module (Mod 1, Mod 0.8) or diametral pitch (32P, 48P). They are different standards and are not interchangeable, even where the numbers look close.
Bore is the pinion’s hole, listed separately from the motor shaft.
Linked part numbers go to the maker’s or official distributor’s page for that part.

How these numbers were settled

The BB-01 spur is the 86T 48 pitch gear Tamiya sells as spare part 51714 for this chassis.

Tamiya prints the BBX at 'Gear ratio = 12.42:1 (using kit 18T pinion gear)', so the ratio after the spur is worked out: 12.42 x 18 / 86 = 2.60.
Rear-wheel drive with a ball differential, a lower deck and a roll cage.
The BBX page prints a 283mm wheelbase.
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.

Parts and electronics

Products 58719 (opens in a new tab)tamiya.comUsed forMain specsSize
Products 58719 (opens in a new tab)tamiya.comUsed forMain specsSize
Tamiya 51714 spur gear (opens in a new tab)tamiya.comUsed forMain specsGearing

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