SIAECOSYS SCJ313
SIAECOSYS SCJ313 is a compact 3.13-inch TFT color speedometer display for electric motorcycles and scooters. 376×960 resolution at 1000 cd/m² brightness — the best daylight-visible SCJ for handlebar installations. Per the QS Motor product page, this speedometer is **built for Fardriver controllers sourced through SIAECOSYS** (with LIN or CAN BUS communication). Although the underlying hardware uses the same SIAECOSYS CAN/LIN protocol family as VOTOL controllers, the OEM only advertises Fardriver compatibility for this model. Very wide operating voltage (DC 12-150V pack-direct). Shows speed, battery SOC (Li-ion or lead-acid), voltage, distance, mode, and fault codes. Background settings include voltage calibration, wheel size/speed adjustment, mile/km switching, and speed limit. IP65 rated, -20°C to +70°C operating range. USB software upgrade. Sits below SCJ3622-A (3.6" round) and SCJ5066-1 (5" rectangular) in the SIAECOSYS TFT display lineup.
In brief: E-bike display. Protocols: SiAECOSYS ONE-LIN, SiAECOSYS CAN BUS. From $67 across 2 sellers.
Specs verified Jul 26, 2026
Where to Find
Prices tracked across 2 sellersAliExpress - SIAECOSYS Electric Drive Store
$66.51
AliExpress - SIA Tech Store
$73.95 $65.95 + $11.80 shipping
* Shipping estimates are for the contiguous US and may vary by location.
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Price History
Current best price $66.51. Over the past 90 days: low $64.86, high $73.98, average $67.62 — down 2% vs average.
- AliExpress - SIAECOSYS Electric Drive Store
- AliExpress - SIA Tech Store
| Date | Price | Shipping | Total | Change | Coupon | Rating | Sales | In Stock | Status |
|---|---|---|---|---|---|---|---|---|---|
AliExpress - SIA Tech Store(8 records) | |||||||||
| May 29, 202608:02 PM | $73.95 | $11.80 | $85.75 | $0.13 | SSUS08−$8.00 | — | — | Yes | active |
| May 28, 202605:33 PM | $73.82 | $11.74 | $85.56 | $0.16 | — | — | — | No | active |
| May 27, 202606:42 PM | $73.98 | $11.77 | $85.75 | $0.16 | — | — | — | Yes | active |
| May 23, 202606:36 PM | $73.82 | $11.74 | $85.56 | $8.86 | — | — | — | Yes | active |
| May 22, 202604:30 PM | $64.96 | $11.74 | $76.70 | $0.04 | USSS05−$5.00 | — | — | Yes | active |
| May 21, 202604:33 PM | $65.00 | $11.75 | $76.75 | $0.00 | USSS05−$5.00 | — | — | Yes | active |
| May 19, 202604:37 PM | $65.00 | $11.75 | $76.75 | $0.14 | USSS05−$5.00 | — | — | Yes | active |
| May 18, 202604:33 PM | $64.86 | $11.72 | $76.58 | Initial | USSS05−$5.00 | — | — | Yes | active |
AliExpress - SIAECOSYS Electric Drive Store(14 records) | |||||||||
| May 29, 202610:33 AM | $66.51 | — | $66.51 | $0.42 | — | — | — | Yes | active |
| May 28, 202609:01 AM | $66.93 | — | $66.93 | $0.35 | — | — | — | Yes | active |
| May 27, 202610:20 AM | $66.58 | — | $66.58 | $0.00 | — | — | — | Yes | active |
| May 25, 202601:55 PM | $66.58 | — | $66.58 | $1.62 | — | — | — | Yes | active |
| May 23, 202610:17 AM | $64.96 | — | $64.96 | $0.00 | — | — | — | Yes | active |
| May 22, 202609:01 AM | $64.96 | — | $64.96 | $0.04 | USSS05−$5.00 | — | — | Yes | active |
| May 21, 202609:07 AM | $65.00 | — | $65.00 | $0.00 | USSS05−$5.00 | — | — | Yes | active |
| May 19, 202609:09 AM | $65.00 | — | $65.00 | $0.14 | USSS05−$5.00 | — | — | Yes | active |
| May 18, 202609:08 AM | $64.86 | — | $64.86 | $1.61 | USSS05−$5.00 | — | — | Yes | active |
| May 17, 202609:01 AM | $66.47 | — | $66.47 | $0.00 | — | — | — | Yes | active |
| May 16, 202609:07 AM | $66.47 | — | $66.47 | $0.00 | — | — | — | Yes | active |
| May 15, 202609:01 AM | $66.47 | — | $66.47 | $0.08 | SRUS02−$2.00 | — | — | Yes | active |
| May 14, 202609:07 AM | $66.55 | — | $66.55 | $0.04 | SRUS04−$4.00 | — | — | Yes | active |
| May 12, 202609:07 AM | $66.51 | — | $66.51 | Initial | SRUS07−$7.00 | — | — | Yes | active |
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Specifications
Specifications
- Protocols
- SiAECOSYS ONE-LIN, SiAECOSYS CAN BUS
- Screen Size
- 80mm
- Light Control
- No
- Phone Charger
- No
- Bluetooth
- No
Physical
- Weight
- 190 g
- IP Rating
- IP65
Ports & Connectors
| Pin | Wire color | Function |
|---|---|---|
| 1 | Orange | Turn Signal Left |
| 2 | Black | Power Switch Signal |
| 3 | Green | Ground |
| 4 | Light Blue | Turn Signal Right |
| 5 | Blue | High Beam |
| 6 | Red | Battery + |
| 7 | Green / Yellow | CAN Low |
| 8 | Red / Black | CAN High |
| 9 | Purple | One-Wire Comm |
