VehiclesECX Circuit 2WD
Specifications
Last modified
| Spec | Value | Basis |
|---|---|---|
| Drivetrain | ||
| Pinion | 19TStock | Stock |
| Spur | 87TStock | Stock |
| Transmission & axle | 2.60:1Stock | Stock |
| Spur ÷ pinion | 4.579:1Calculated | Calculated |
| Final drive | 11.90:1Stock | Stock |
| Wheels & tires | ||
| Tire diameter | 102.4mmStock | Stock |
| Rollout | 27.0mm per motor turnCalculated | Calculated |
| Power | ||
| Motor | Not applicable | |
| Motor shaft | 3.175 mmStock | Stock |
| Battery | Up to 2SLiPoStock | Stock |
| Performance | ||
| Theoretical top speed | Not applicable | |
| Vehicle | ||
| Part number | ECX03430 | |
| Scale | 1/10 | |
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
| Component | Teeth | Pitch | Bore | Part number |
|---|---|---|---|---|
| Fitted at the factory | ||||
| Pinion | 19T | 48P | Not published | ECX1073 (opens in a new tab) |
| Spur | 87T | 48P | Not applicable | ECX1076 (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 (3.175 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
A 2WD stadium truck.
- Horizon's spec table prints a 19T pinion, an 87T spur and a 4.03in (102.4mm) outer tire diameter, and the manual's parts list names the ECX1073 19T pinion.
- The transmission and diff ratio of 2.6 is the figure Horizon prints for this family of ECX 1/10 2WD trucks (the Ruckus and Torment 2WD Brushless pages and the AMP MT kit page, where 18T on 87T is printed as a 12.6 total); this truck's manual lists the same ECX1022 transmission gear set, which Horizon sells as the gear set for all ECX 1/10 2WD models.
- The total is worked out as 87/19 x 2.6 = 11.91.
- The manual rates the ESC for 2S LiPo or 5 to 7 cell NiMH with motors down to 12T.
- The motor is a Dynamite 15T brushed 540, which has no KV rating.
- The older LiPo-bundled Circuit (ECX03330) prints the same gearing and tire.
Documents
- ManualOwner's manual, Circuit 2WD (Horizon PDF) (opens in a new tab)Gear mesh, p. 8
- Exploded viewParts diagram (in the manual) (opens in a new tab)Pinion and spur, p. 47
- Parts listReplacement parts list (in the manual) (opens in a new tab)Items 40-42, p. 48-49
Sources
- ECX03430horizonhobby.com (opens in a new tab)
- Manual (PDF)horizonhobby.com (opens in a new tab)
- ECX03330horizonhobby.com (opens in a new tab)
- ECX03034horizonhobby.com (opens in a new tab)
- ECX1022horizonhobby.com (opens in a new tab)
- ECX1073horizonhobby.com (opens in a new tab)
- ECX1076horizonhobby.com (opens in a new tab)
- DYN1172horizonhobby.com (opens in a new tab)
Every figure on this page traces to one of these. Where they disagreed, the note above says which was used and why.