VehiclesTamiya TRF211XM Chassis Kit

Tamiya TRF211XM Chassis Kit Chassis

Name: Tamiya TRF211XM Chassis Kit
Brand: Tamiya
SKU: 42288

1/10 scale · 2WD buggy chassis kit · 42288

Tamiya's TRF211XM Chassis Kit is a 1/10 rear-motor, rear-wheel-drive race buggy kit, sold with a body and wing but without motor, tires or pinion.

Its 79T spur works through a 2.60:1 gearbox and axle stage, and Tamiya's chart for that spur runs from 8.56:1 on a 24T pinion to 9.34:1 on a 22T. It sits on a 285 mm wheelbase and takes either a gear or a ball differential. Match the pinion to the motor your class allows, then check the final drive in the gearing tool.

Transmission & axle: 2.60:1
Spur: 79T
Wheelbase: 285mm
Introduced: 2015

Gearing Top speedverified

Sold without a motor, so there is no stock KV: compare gearing by rollout.

Tamiya TRF211XM Chassis Kit — Photo: Tamiya (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. This one is 402 mm long. Part number The maker's product number for this exact version. A V2, a new color, or a kit instead of an RTR usually has a different number, and parts can differ between them. Check it against your box or receipt before ordering parts.
Class	Buggy
Drive	2WD
Build	Kit
Scale	1/10
Part number	42288
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 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. The range comes from the maker's gearing chart for the pinions it lists.
Pinion	Not applicable
Spur	79TStock	Stock
Transmission & axle	2.60:1Stock	Stock
Final drive	8.56 to 9.34:1 on 24T to 22T pinionsMaker'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. Race tires wear down over a day, and a smaller tire gears the car shorter.
Tire diameter	Not applicable
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. Motor shaft The diameter of the motor's output shaft, which a pinion's bore must match. This vehicle comes without a motor, so 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	Not applicable
Motor shaft	Not applicable
Battery	Not applicable
Performance
Theoretical top speed It needs a motor KV, and this vehicle comes without a motor. Fit one and the calculator works it out from the motor's KV and the gearing.
Theoretical top speed	Not applicable
Size & weight
Length Overall length as the maker states it, usually with the body fitted. Useful for comparing real size, since scale labels are loose. Width Overall width as the maker states it, usually with the body fitted. A wider car is more stable in corners and harder to roll over. 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.
Length	402 mm15.8 inStock	Stock
Width	236 mm9.3 inStock	Stock
Wheelbase	285 mm11.2 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 applicable means the vehicle does not come with it, like the motor on a roller or the tires on a race kit, or does not have one, like a KV rating on a brushed motor.
Maker’s chart is the ratios the maker prints for this chassis with the pinions it names.

How these numbers were settled

Rear-motor, rear-wheel-drive race buggy kit with a selectable gear or ball differential and a slipper clutch; the body and rear wing are included, the motor, tires, wheels and electronics are not.

The manual names the '79T Spur gear' (BB31, PDF p. 6) and prints the formula 'Spur gear teeth (79T) / Pinion gear teeth x 2.60', with a chart for the 79T spur: 22T 9.34, 23T 8.93 and 24T 8.56 (PDF p. 19).
It says to use a separately available 48 pitch pinion, so no pinion comes in the box and the final drive depends on the one fitted.
Tamiya's page prints the same range, 'ギヤ比=8.56~9.34(キット標準24T 8.56:1)', and a 285mm wheelbase.
The chart also lists an optional 77T spur, 9.10:1 on 22T to 8.01:1 on 25T.

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

TRF211XM instruction manual (Tamiya PDF) (opens in a new tab)79T spur BB31, PDF p. 6; gearing chart Setting up, PDF p. 19d7z22c0gz59ng.cloudfront.netUsed forMain specs

This vehicle

Tamiya TRF211XM Chassis Kit product page (opens in a new tab)tamiya.comUsed forMain specsSize

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