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    Frequently Ask Questions & Manuals

    What is the top speed that can be displayed by the bike computer?
    All SIGMA SPORT bike computers can display a maximum speed of 199.8 km/h.
    How is the wheel diameter determined?
    - Multiply the wheel diameter in mm or cm by 3.14.
    - Measure the distance travelled in one complete turn of the wheel.
    With which operating systems is the DATA CENTER evaluation software compatible

    The DATA CENTER evaluation software can be used with Windows and Mac OS X operating systems.

    • x86-compatible processor with at least 2.33 GHz or Intel Atom™ with at least 1.6 GHz for netbook devices
    • Microsoft® Windows® XP, Windows Server® 2003, Windows Server 2008, Windows Vista® Home Premium, Business, Ultimate or Enterprise (incl. 64 Bit) with Service Pack 2, Windows 7 or Windows 8 Classic
    • 512 MB RAM (1 GB recommended)
    Mac OS
    • Intel® Core™ Duo 1.83 GHz or faster
    • Mac OS X Version 10.6, 10.7, 10.8 or 10.9
    • 512 MB RAM (1 GB recommended)
    When am I entitled to make a warranty claim?
    You can make a warranty claim in relation to material and workmanship defects. The warranty does not cover batteries, wear-and-tear parts, wear caused by commercial usage, or accidents. You are only entitled to make a warranty claim if the SIGMA product itself has not been opened without authorization and the receipt of purchase is provided.
    For which bike computers can the DATA CENTER be used?
    The DATA CENTER can be used for all TOPLINE 2009, TOPLINE 2012, and ROX series devices.
    When using a chest belt, what do I have to consider to ensure that my heart rate can be correctly measured?
    To activate the chest belt, regardless of the model, the electrodes must be moist. If these are NOT moist, a seamless heart rate measurement cannot be guaranteed.
    My heart rate is only correctly displayed after approx. 15 min. What can I do?
    If an inaccurate heart rate reading is often displayed at the start of a training session, this can be due to the chest belt being too dry. If you experience this problem regularly, also moisten the chest belt at the points that are directly beneath the contact surfaces of the chest belt. This will provide moisture for the first few minutes until you start to sweat. The heart rate measurement should now work properly again.
    Where can I get the DATA CENTER evaluation software?
    DATA CENTER can be purchased from the SIGMA online shop at
    What must I consider when taking care of my chest belt?
    Care instructions for the standard chest belt: After every training session, wash the belt and the transmitter with clean water and hang them up to dry.

    Regularly clean the transmitter with a mild soap solution.

    Wash the belt regularly (every 3 - 4 weeks) using your washing machine’s hand wash program. For washing, only use mild detergent and a wash bag. Care instructions for textile chest belts such as COMFORTEX/COMFORTEX+: Remove the transmitter from your COMFORTEX/COMFORTEX+ chest belt after every training session. Wash the COMFORTEX/COMFORTEX+ belt with clean water and hang it up to dry.

    Wash the COMFORTEX/COMFORTEX+ chest belt regularly (every 3 - 4 weeks) using your washing machine’s hand wash program. For washing, only use mild detergent and a wash bag.

    Please note that you should never put your COMFORTEX/COMFORTEX+ in a dryer or allow it to dry in direct sunlight. It should also not be bleached or ironed

    Never clean your COMFORTEX/COMFORTEX+ chest belt with aggressive detergents or chemicals.
    Are additional accessories needed to transmit and evaluate the trip data?
    The trip data can be manually input directly into the software or automatically transmitted using the optionally available docking station.

    The docking station not only enables you to automatically transmit data but also to conveniently configure your bike computer via your PC.

    It can be purchased from the SIGMA online shop at or in store from your specialist retailer.
    Why is the bike computer displaying the message "Low Bat" even though the voltage reading shows as 3V?

    A pure voltage measurement (e.g. with a multimeter) without any battery load does not provide precise information about the (residual) capacity of a button cell battery. The battery can still have a voltage of 3 V without load but of only 2.4 V when under load, e.g. if the wireless receiver is operating.

    How does Sigma determine if a battery is dead?
    The bike computer measures the voltage of the button cell under a defined load. It can then calculate the cell’s residual capacity based on the voltage dip under this load. The "Low Bat" message is activated when the total capacity falls below approx. 25%.
    What minimum and maximum temperatures are displayed?

    Minimum temperature: 14°F/-10°C

    Maximum temperature: 158°F/70°C

    What is the purpose of the intensity zones?

    Intensity zones originate from sports medicine and are mainly used in relation to endurance training. Intensity zones help to track long term fitness goals where target zones are best for short term goals. In the ROX 5.0 and ROX 6.0, the default setting is as follows:

    BE1: Basic endurance 1, 60-70% of the HR max

    BE1/2: Basic endurance 1/2, 70-80% of the HR max

    BE2: Basic endurance 2, 80-90% of the HR max

    CE: Competition endurance, 90 – 100% of the HR max

    What is the purpose of the target zone?

    The target zone defines the heart rate range in which you should be training. A visual and acoustic alarm signals if your heart rate is outside this zone.

    Can I change the battery of ROX 10.0 GPS?

    The capacity of a Lithium Ion battery naturally decreases over the life cycle of the battery. The ROX 10.0 GPS lithium ion battery is guaranteed to maintain 75% capacity (9 hours) for up to 2 years, or 300 complete battery charge cycles; whichever comes first. After this warranty period, a battery exchange program is available through SIGMA SPORT USA for $79.99 .

    How do I connect/pair the ANT + transmitter with my device?

    All information about Ant + pairing can be found in our video tutorial:

    Which min./max. wheel circumference can be set as value?

    Wheel circumference min. 500 mm

    Wheel circumference max. 3999 mm

    With the ROX 12.0 GPS, even an input less than 500 mm can be adjusted.

    What is the maximum speed that the bike computer can display?

    The speed is displayed up to 199.8 km/h.

    What warranty entitlement do I have?

    Warranty claims can be made in the event of material and workmanship errors. Excluded from the warranty are batteries, elastic straps, textile chest straps, e.g. Comfortex, wear and tear parts and wear due to commercial use or accidents. If no speed is displayed, this can be due to the transmitter or the computer.

    How can I obtain a replacement?

    Accessories are available in the Sigma Webshop