Bike and Byte — Bike Computer Guide | bikeandbyte.com
Ordered setup: mount the unit, enter the 2110 mm circumference, pair ANT+ sensors, check the first ride.
Step 1 — Mount the unit. Seat the bracket on the stem or bar and click the head unit in until it latches. On a magnet-based unit, place the spoke magnet opposite the fork sensor with a gap of a few millimetres so the reed switch triggers at speed.
Step 2 — Set the wheel size. On any magnet-based unit, open the wheel-circumference menu and enter 2110 mm for a typical 700x25c road tyre (ETRTO 25-622). Skipping or mistyping this entry skews every speed and distance reading by a fixed percentage; GPS units skip this step because speed comes from position.
Step 3 — Pair ANT+ sensors. ANT+ is a low-power wireless sensor protocol developed by Dynastream Innovations, a Canadian company acquired by Garmin in 2006. Open the sensor menu, add each sensor one at a time — cadence, heart rate, power — and confirm its live reading before adding the next. A sensor on a different radio band will not appear in the list.
On narrow screens, swipe or scroll the plate sideways.
Step 4 — Check the first ride. Ride a short loop and confirm speed responds to pedalling, cadence shows 60–100 rpm with a steady 80–90 rpm, heart rate reads 120–150 bpm on moderate terrain, and power (if fitted) reads 100–250 W. Note the battery: GPS recording runs roughly 12–20 hours per charge.
Typical failures in order: distance off by a constant ratio means the wheel circumference entry is wrong; speed stuck at 0 means the magnet gap is too wide or the fork sensor battery is flat; a blank cadence or heart-rate field means the sensor is unpaired or on the wrong radio band.
Budget about five minutes for a magnet unit and ten to fifteen for a GPS unit with two or three paired sensors. Re-check the wheel size after any tyre change, since a different tyre width changes the circumference.
Further reading