Specifications
Every Detail, No Fluff.
We publish full specs because we think you should know exactly what you're buying before you buy it. No vague marketing claims — just numbers.
Physical
Weight14g (without mount)
Dimensions42 × 28 × 12mm
HousingCarbon-reinforced polymer
MountSaddle rail clip (7mm, 9mm oval compatible)
Water ResistanceIPX7 (submersible to 1m / 30 min)
Operating Temperature−10°C to 60°C
Sensors
IMUBosch BMI270 — 6-axis (3× accelerometer, 3× gyroscope)
Sampling Rate100Hz per axis (600 data points/sec total)
Angular Precision±0.1°
BarometerBosch BMP390 — ±0.1m altitude accuracy
Strain Gauges4× bonded foil, full Wheatstone bridge
Force Range0–2000N with 0.5N resolution
Processor & Memory
SoCNordic nRF52840 — ARM Cortex-M4F @ 64MHz
RAM256KB
Flash1MB internal + 8MB external (data logging)
Sensor FusionExtended Kalman filter, <10ms latency
Connectivity
BluetoothLE 5.0 (multi-connection, up to 3 devices)
ANT+Dual-channel broadcast
Data Export.FIT file format (standard)
USBUSB-C for charging & firmware updates
OTA UpdatesYes, via companion app
Power
Battery110mAh LiPo
Runtime40 hours (continuous recording)
Standby6 months
ChargingUSB-C, 45 min to full
Charging Cycles500+ cycles to 80% capacity
Computed Metrics
CdA (Drag Coefficient × Area)Real-time, ±2% vs wind tunnel
Body PositionHoods / drops / aero / climbing — auto-detected
Pedaling DynamicsCadence, smoothness, left-right balance
Power EstimationVirtual power from force + velocity model
Altitude & GradientBarometric, corrected against GPS
EnvironmentalAir density, temperature-compensated
Compatibility
If your device speaks ANT+ or Bluetooth, it works. No proprietary dongles, no companion app required for basic functionality.
Head Units
- Garmin Edge 540/840/1040
- Wahoo ELEMNT BOLT/ROAM
- Hammerhead Karoo 2/3
- Bryton Rider S800
- Sigma ROX 12.1
Software
- Strava
- TrainingPeaks
- Golden Cheetah
- intervals.icu
- TrainerRoad
- Zwift
- WKO5
Mobile
- DIDI.BIKE App (iOS 15+ / Android 12+)
- Garmin Connect
- Wahoo ELEMNT App
What's In the Box
DIDI.BIKE Sensor (14g)
Saddle rail mount (7mm & 9mm adapters)
USB-C charging cable (30cm)
Quick start guide
Calibration certificate (individual unit)
Hex key for mount adjustment