Sigma ROX 4.0

The Sigma ROX 4.0 is proof that you don't need to spend 300 euros to get serious GPS functionality on your handlebar. For under 70 euros you get a computer that pairs with GPS, GLONASS and Galileo — three satellite systems at once — and in flat Dutch polder country that's more than enough for reliable positioning. The difference with the multi-band receiver of the Edge 540 mainly shows in urban canyons: in central Amsterdam or The Hague the ROX can drift a few meters, but along the tow path to Haarlem or on the Betuweroute there's no practical gap. Where this Sigma is fundamentally different: no maps, only track navigation.

You load a GPX in advance through the Sigma Ride app and the computer shows a line with direction arrows. That's perfect for Knooppunten routes you've plotted at home or an LF route you want to ride for an evening, but it's not built for improvising mid-ride or exploring unfamiliar territory. For the Dutch cycling landscape, where you rarely truly get lost and Knooppunten signs are everywhere, that approach works very well. The 25-hour battery is the surprise of this price class — even longer than the Wahoo Bolt V2 — and means a long weekend without a charger.

The black-and-white screen is less glamorous than the color LCDs of its rivals but often reads better in bright sunlight and saves battery. ANT+ and Bluetooth pairing work with any standard heart rate strap and speed sensor, so you can upgrade step by step. Compared with the Garmin Edge 130 Plus the ROX 4.0 offers a bigger screen and longer battery for the same or less money, but you lose Garmin's ClimbPro and the seamless Connect ecosystem. For recreational tourers, e-bike commuters and anyone who wants speed, distance and a route without obsessing over training analytics, this is the smartest buy in the test field for 2026.