Sigma BC 12.0 WR Wireless Bike Computer

On a crisp morning commute or a long weekend tour, the Sigma BC 12.0 WR keeps every ride metric within a quick glance. This wireless bike computer mounts tool-free to handlebar or stem, pairing with a fork-mounted speed sensor for clean, cable-free setup. Its large segment display shows current speed, average speed, maximum speed, trip distance, total distance, ride time, total ride time, and a 12/24-hour clock. A backlight ensures readability in low light, while automatic start/stop and a service interval reminder add everyday practicality. The IPX8-rated housing shrugs off heavy rain and even temporary submersion, so you can ride through downpours without worry. Two bike profiles let you switch between a road bike and commuter without reprogramming. Temperature display and fuel savings readout round out a feature set that’s both thorough and easy to use.

Key specifications

• Wireless analog transmission (ATS) – no cables between sensor and head unit
• Two bike profiles with independent odometers
• Speed functions: current, average, maximum
• Distance functions: trip distance and total distance
• Time functions: ride time, total ride time, clock (12/24h)
• Temperature display and current vs. average speed comparison
• Fuel savings display and service interval reminder
• Segment display with backlight
• Automatic start/stop
• Water resistance: IPX8 (protected against continuous immersion)
• Batteries: CR2450 (computer), CR2032 (speed sensor)
• Tool-free mounting for handlebar or stem
• Predefined tire sizes and 7 language options

Why choose it

The Sigma BC 12.0 WR balances essential ride data with rugged, low-maintenance design. Its wireless setup eliminates zip ties and cable rub, while the IPX8 rating means you never have to check the forecast before heading out. Two bike profiles and automatic start/stop make it a true set-and-forget companion. The backlit display and large digits keep information legible at a glance, even on bumpy roads. With a long-lasting CR2450 battery and tool-free mount, you spend less time fiddling and more time riding.

Ideal use cases

• Daily commuting in all weather conditions
• Road cycling and fitness training with speed tracking
• Touring and bikepacking where total distance matters
• Riders who switch between two bikes and want separate odometers
• Anyone who wants a reliable, cable-free computer without GPS complexity

Good to know

The BC 12.0 WR uses an analog wireless signal, which is immune to interference from Bluetooth or ANT+ devices. The speed sensor mounts on the front fork and pairs automatically with the head unit. Batteries are user-replaceable and widely available. The service interval reminder can be set to alert you after a chosen distance, helping you stay on top of chain, brake, and tire maintenance. The computer supports seven languages, making it suitable for international use or multilingual households.