VehiclesElement RC RC10 Trail Truck Cattleman Kit

Element RC RC10 Trail Truck Cattleman Kit

Name: Element RC RC10 Trail Truck Cattleman Kit
Brand: Element RC
SKU: 40138

1/10 scale · crawler · 40138

The RC10 Trail Truck Cattleman is a 1/10 four-wheel-drive trail truck kit from Element, built by you and supplied with a 20T pinion, wheels and tires but no motor or electronics.

The 20T 48P pinion meshes with an 87T spur ahead of the Stealth X gearbox, which overdrives the front axle slightly. It rolls on tires of about 118 mm with 12 mm hexes, measures 462 mm long on a 313 mm wheelbase, and comes with 30 wt shock oil. Choose a motor that suits the 20T pinion, or change the pinion to match a hotter or milder motor.

Tire: 118.11mm

Crawler

Weight distribution Crawler gearingsourced

Weigh each corner to balance the chassis, then work out reduction and axle overdrive.

Element RC RC10 Trail Truck Cattleman Kit — Photo: Element RC

Specifications

Last modified Sep 27, 2026

Spec	Value	Basis
Vehicle
Class	Crawler
Drive	4WD
Power	Motor not included
Build	Kit
Scale	1/10
Part number	40138
Drivetrain
Pinion	20TStock	Stock
Spur	87TStock	Stock
Transmission & axle	Not applicable
Final drive	Not applicable
Wheels & tires
Tire diameter	118.1mmStock	Stock
Wheel hex	12 mmStock	Stock
Power
Motor	Not applicable
Motor shaft	Not applicable
Battery	Not applicable
Performance
Theoretical top speed	Not applicable
Chassis
Length	462 mm18.2 inStock	Stock
Width	260 mm10.2 inStock	Stock
Wheelbase	313 mm12.3 inStock	Stock
Shock oil, front	30 wtStock	Stock
Shock oil, rear	30 wtStock	Stock

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.

Gearing parts

Pinion and spur parts for the Element RC RC10 Trail Truck Cattleman Kit: fitted, and optional gearing supplied in the box
Component	Teeth	Pitch	Bore	Part number
Fitted at the factory
Pinion	20T	48P	3.175 mm	1338 (opens in a new tab)Team Associated
Spur	87T	48P	Not applicable	42035 (opens in a new tab)Team Associated

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 kit comes with General Grabber X3 tires on Method 701 wheels and a 20T 48P pinion (#1338), which the manual fits without marking it 'Not Included'; the motor, ESC, receiver, servo and battery are marked 'Not Included'.

Element's spec table prints 'Internal Gear Ratio: varies' because the Stealth X gearbox turns the front and rear axles at different speeds, so the transmission and axle ratio and the final drive are left blank.
The manual names an 87T 48P Octalock spur (#42035), a fixed 20T-28T-52T front train with the 27T-53T rear pair fitted (5.7% front overdrive), and 30T/8T ring and pinion gears in both axles.
With the included 20T pinion that works out to about 42.4:1 at the front and 44.8:1 at the rear; the 26T-54T rear pair (11.83% overdrive) would give about 47.4:1 at the rear.
The 1.9 x 4.65 in tire size comes from Element's product page and the manual's feature list.

Documents

ManualRC10 Trail Truck Cattleman Kit manual (Element RC PDF) (opens in a new tab)Gearbox p. 7-8, axles p. 8-9, Stealth X options p. 20

Sources

Every figure on this page traces to one of these. Where they disagreed, the note above says which was used and why.