iPhone as a Bike Computer: Everything You Need, Already in Your Pocket
A serious cycling computer (one that shows live power, navigation, and full sensor data) costs $400 or more, before you add a power meter. Bike IQ turns the iPhone already in your pocket into exactly that, without the extra device.
Why Use Your iPhone Instead of a Garmin or Wahoo?
The most important reason isn't price. It's this: one screen, everything on it, always.
Garmin and Wahoo are built around data pages. You configure screens and swipe between them mid-ride. It's a workflow designed around the limitations of a small display. Bike IQ takes the opposite position: your map, your power, your speed, grade, heart rate, cadence, weather: all visible simultaneously, without touching the screen. The larger iPhone display makes this possible in a way a 2.6" cycling computer simply can't match.
That's an opinionated design choice, and it's intentional. The best moment to know your power is while you're on the climb, not after you've swiped to the right page. The best moment to see the map is the same moment you're watching your effort. No pages means no decisions about what to look at. Full context, always.
- No pages, no swiping: Every metric (power, speed, grade, heart rate, map, weather) on one screen at once. The way riding data should work.
- Bigger screen: A 6.1" iPhone display is nearly twice the size of a Garmin Edge, built for one-glance reads at speed.
- Power without hardware: Garmin and Wahoo display numbers your sensors send them. No power meter, no power data. Bike IQ estimates power from physics, from ride one.
- Already in your pocket: Most cyclists carry their iPhone anyway. Bike IQ makes it do significantly more.
What Bike IQ Shows You During a Ride
Single-screen design: everything visible at once, no swiping.
From Your iPhone's Built-in Sensors
- Power: estimated watts in real time via the virtual power meter
- Speed: current pace via GPS
- Grade: road gradient from barometer + accelerometer fusion
- Distance and elapsed time
- Live map: your position, always visible
- Weather: temperature and wind conditions
From Paired Bluetooth Sensors (Optional)
- Heart rate: live BPM and HR zones from a Bluetooth HRM, displayed as an independent metric alongside power and speed
- Cadence: pedal RPM from a cadence sensor
- Speed: wheel-speed data from a speed sensor (supplements GPS)
- Power: real watts from a hardware power meter (also calibrates the virtual power model)
On a Garmin, you'd configure multiple data screens and swipe between them. On Bike IQ, one glance gives you everything.
Battery Life
The most common concern, and it deserves a direct answer.
Bike IQ uses roughly 10% battery per hour on a typical ride: GPS active, screen on, Bluetooth sensors connected. That means a standard iPhone handles a 6-hour ride with charge to spare, and newer models (iPhone 15 Pro and later) can push close to 10 hours before needing a top-up.
For rides beyond that: A handlebar-mounted USB-C battery pack solves it completely. An Anker or Mophie in a frame bag or jersey pocket keeps you running indefinitely, the same solution most long-ride cyclists already use for navigation.
Extending battery:
- Reduce screen brightness (the single biggest factor)
- Enable Low Power Mode before long rides
- Use a mount that blocks direct sunlight. Heat drains batteries faster than usage
- Disable cellular data on familiar routes
Mounting Your iPhone
A good mount makes the difference.
Stem Mounts (Recommended)
Position your phone directly in your line of sight, the same spot as a Garmin. Quadlock and K-Edge make excellent stem-compatible systems with secure mechanical locks. Quadlock's MagSafe cases work well with recent iPhones.
Out-Front Handlebar Mounts
Similar position to stem mounts with more flexibility. Good option if your stem doesn't fit a standard mount.
What to Avoid
Cheap rubber band-style mounts. Vibration on rough roads will shake them loose. Use a mount with a mechanical lock.
Bike IQ vs. Dedicated Cycling Computers
| Feature | Bike IQ (iPhone) | Garmin / Wahoo |
|---|---|---|
| Power without a power meter | Built-in virtual power | Not available |
| Cost | Free download | $400+ (serious computers) |
| Screen size | 6.1"+ display | 2.6"–3.5" display |
| Learns your aerodynamics (CdA, Crr) | Adaptive model | Static display |
| Battery (no external charger) | 6–10 hours (≈10%/hr) | 8–24 hours typical |
| Bluetooth sensor support | Power, HR, cadence, speed | Power, HR, cadence, speed |
| Phone, music, navigation | It's your iPhone | Single-purpose |
Already Have a Garmin?
If you ride with a Garmin but don't own a power meter, run Bike IQ alongside it. You get virtual power data your Garmin can't provide. Many riders find they prefer the larger display and integrated map for most riding situations.
Get Started
Five minutes from download to first ride. See the Getting Started Guide for setup, or learn how the virtual power meter works.