VehiclesHobby Plus Speck-B Brushed
Specifications
Last modified
| Spec | Value | Basis |
|---|---|---|
| Drivetrain | ||
| Pinion | 12TStock | Stock |
| Spur | 45TStock | Stock |
| Transmission & axle | 3.43:1Derived | Derived |
| Final drive | 12.85:1Stock | Stock |
| Wheels & tires | ||
| Tire diameter | Not published | |
| Power | ||
| Motor | Not applicable | |
| Motor shaft | Not published | |
| Battery | Up to 2SLiPoStock | Stock |
| Performance | ||
| Theoretical top speed | Not applicable | |
| Advertised top speed | 13mphMaker's claim | Maker's claim |
| Vehicle | ||
| Part number | HBP2410250 | |
| Scale | 1/24 | |
| Class | Buggy | |
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 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
| Component | Teeth | Pitch | Bore | Part number |
|---|---|---|---|---|
| Fitted at the factory | ||||
| Pinion | 12T | Mod 0.5 | Not published | 250121 (opens in a new tab) |
| Spur | 45T | Mod 0.5 | Not applicable | 250121 (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. Linked part numbers go to the maker's or official distributor's page for that part.
How these numbers were settled
Hobby Plus's page for the Speck spur, idler and pinion set (250121) prints a gear chart whose standard Speck B ratio is a 12T 0.5M pinion on a 45T 0.5M spur for a 12.85:1 final drive.
- The transmission and differential reduction after the spur is worked out from that chart: 12.85 x 12 / 45 = 3.43, and the chart's five optional pairings all agree with it.
- The motor is an 030 63T brushed can, so there is no KV.
- The FlySky ESC/RX combo (250147) is shared across every Speck model, and the Speck SCT page rates that ESC at 2S maximum.
- The page lists the wheels as 32.8mm front and 34.5mm rear outer diameter, but those are wheel figures and no tire diameter is published, so the tire is left blank.
- Hobby Plus claims 13 mph out of the box; it cannot be checked against a brushed motor.
- Colour variants carry C1 and C2 suffixes on this base number.
Documents
- ManualInstruction manual, Speck B brushed/brushless (PDF) (opens in a new tab)Reduction gear box p. 20; brushless motor p. 26
- Parts listParts list, Speck B (in the instruction manual PDF) (opens in a new tab)Parts list p. 30-31
- Gearing chartGear ratio chart, Speck B (Hobby Plus gear set page 250121) (opens in a new tab)Gear Ration Chart Speck B
Sources
- speck-b-1-24-2wd-buggy-choo…hbplusrc.com (opens in a new tab)
- spur-idler-pinion-gear-speckhbplusrc.com (opens in a new tab)
- speck-sct-1-24-2wd-rtr-brus…hbplusrc.com (opens in a new tab)
- 1-24-speck-b-2wd-buggy-rtr-…hbplusrc.com (opens in a new tab)
- Manual (PDF)cdn.shopify.com (opens in a new tab)
- brushed-motor-030-55t-speck…hbplusrc.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.