VehiclesTeam Associated Apex2 Sport A550 Rally Car RTR

Team Associated Apex2 Sport A550 Rally Car RTR

1/10 scale · touring and drift body · 30126

Final drive: 9.36:1

Open in Top Speedsourced

Team Associated Apex2 Sport A550 Rally Car RTR — Photo: Team Associated

Specifications

Last modified Sep 25, 2026

Spec	Value	Basis
Drivetrain
Pinion	20TStock	Stock
Spur	72TStock	Stock
Transmission & axle	2.60:1Stock	Stock
Final drive	9.36:1Stock	Stock
Wheels & tires
Tire diameter	Not published
Power
Motor	Not applicable
Motor shaft	Not published
Battery	Up to 3SLiPoStock	Stock
Stock motor	Reedy 550 15-turn, 3-slot motorStock	Stock
Stock ESC	Reedy SC500X programmable brushed ESCStock	Stock
Battery connector	T-PlugStock	Stock
Performance
Theoretical top speed	Not applicable
Chassis
Length	458 mm18 inStock	Stock
Wheelbase	259 mm10.2 inStock	Stock
Diff oil, front	5KStock	Stock
Diff oil, rear	5KStock	Stock
Vehicle
Part number	30126
Scale	1/10
Class	Touring and drift body

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

Gearing parts

Pinion and spur parts for the Team Associated Apex2 Sport A550 Rally Car RTR: 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)
Spur	72T	48P	Not applicable	92149

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 RTR manual fits a 20T 48P pinion (1338) on the Reedy 550 brushed motor and a 72T 48P spur (92149) on the center spool (pp. 12-13); a 30T drive gear (31860) on its own shaft sits between them as an idler and does not change the ratio.

The product page and the RTR press release print a 2.6:1 internal ratio, the ring and pinion (34T/13T, part 31887) that the maker's part page calls 2.6, so the total of 9.36:1 is worked out as 72 / 20 x 2.6.
The maker does not publish the diameter of the rally block tires on their 1.9 in (41mm) wheels.
The motor is brushed (550, 15 turns), so it has no kV rating; the Reedy SC500X speed control is rated for 2-3S LiPo.
The front and rear gear differentials are filled with 5,000 cSt diff fluid; the friction-damper shocks use 80,000 cSt diff fluid (5448) on the shaft instead of shock oil.
The product page gives the width as 190mm and the press release as 200mm, so the width is left blank.
The Apex2 Sport ST550 RTR (30127) is the same chassis with the same gearing, motor and speed control under a Super Touring body, on touring tires whose diameter is not published either.

Documents

ManualApex2 Sport A550 Rally RTR instruction manual (Associated PDF) (opens in a new tab)Diffs and shocks p. 8, pinion p. 12, spur p. 13

Sources

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