VehiclesTeam Associated Rival MT8 RTR

Team Associated Rival MT8 RTR

1/8 scale · monster truck · 20520

Final drive: 12.76:1

Open in Top Speedsourced

Team Associated Rival MT8 RTR — Photo: Team Associated

Specifications

Last modified Sep 25, 2026

Spec	Value	Basis
Drivetrain
Pinion	11TStock	Stock
Spur	48TStock	Stock
Transmission & axle	2.92:1Derived	Derived
Final drive	12.76:1Stock	Stock
Wheels & tires
Tire diameter	Not published
Power
Motor	2100KVStock	Stock
Motor shaft	5 mmStock	Stock
Battery	Up to 6SLiPoStock	Stock
Stock motor	Reedy 680-SL4 2100kVStock	Stock
Stock ESC	Reedy SC1500-BLStock	Stock
Battery connector	T-PlugStock	Stock
Performance
Theoretical top speed	Not published
Chassis
Weight	4.71 kg (10.4 lb)without batteryStock	Stock
Length	575 mm22.6 inStock	Stock
Width	411 mm16.2 inStock	Stock
Wheelbase	330 mm13 inStock	Stock
Diff oil, front	60KStock	Stock
Diff oil, center	100KStock	Stock
Diff oil, rear	30KStock	Stock
Shock oil, front	50 wtStock	Stock
Shock oil, rear	50 wtStock	Stock
Vehicle
Part number	20520
Scale	1/8
Class	Monster truck

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. Not published means it exists but no source we could find prints it.

Gearing parts

Pinion and spur parts for the Team Associated Rival MT8 RTR: fitted, and optional gearing supplied in the box
Component	Teeth	Pitch	Bore	Part number
Fitted at the factory
Pinion	11T	Mod 1	5 mm	25927 (opens in a new tab)
Spur	48T	Mod 1	Not applicable	25904 (opens in a new tab)

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 (5 mm on the stock motor). Linked part numbers go to the maker's or official distributor's page for that part.

How these numbers were settled

The manual fits an 11T Mod 1 motor pinion (25927, p. 17) and a 48T spur on the center diff (25904, p. 6), and the parts list names both as the parts in the truck.

The front and rear diffs use 38T ring gears (25924) driven by 13T pinions (25925), per the manual (p. 6 and 8).
Associated does not print a gear ratio for the MT8, so the 2.923:1 ratio after the spur (38/13) and the 12.755:1 final drive are worked out from those tooth counts.
The Reedy 680-SL4 motor is rated 2100kV and the Reedy SC1500-BL ESC is rated for 3S, 4S and 6S LiPo; the LiPo combo ships with a 4S pack.
Associated does not publish the diameter of the MT8 tires (25919), so the tire size is left blank.
The Teal version (20521) is the same truck in another colour.

Documents

ManualRival MT8 RTR instruction manual (Associated PDF) (opens in a new tab)Spur and diffs p. 6, pinion p. 17
Parts listRival MT8 RTR parts list press release (Associated PDF) (opens in a new tab)Spur 25904 p. 1, pinion 25927 p. 2

Sources

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