Sigma ROX 9.0 Triple Wireless Computer

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Price: $224.95    

Product Feature

• Sophisticated wireless bicycle computer with dozens of functions
• Measures current, average, and maximum speed; built-in heart rate monitoring
• Reads current altitude and incline/decline; displays total climb/descent
• 3 cadence functions; stopwatch, countdown timer, clock, and alarm
• USB interface; compatible with Sigma Data Center training software

Product Description

The SIGMA ROX answers just about all the questions you could imagine. Besides measuring altitude, inclination and temperature, the newly developed digitally encoded 3-channel wireless STS (SIGMA TRANSMISSION SYSTEM) makes it possible to use several sensors, such as pulse measurement, speed and cadence transmitter, at the same time. PC Interface included, 78-hour log capacity with the ability to set way-points. Monitors percent gradient and temperature, has a seven trip memory. Features customizable display that allows the user to view ten favorite functions simultaneously while riding. Wireless speed, cadence and heart rate via encoded data transfer which eliminates cross-talk. Features 64 total functions in 12 different categories.

Sigma ROX 9.0 Triple Wireless Computer Review

I have been using this computer for more than 3 months now and here are my observations.
PROS:
1) Overall a good value for the price paid , I think the combination of wireles monitoring of cadence,speed, HR and logging memory is unique in this price range. However, if you want a GPS capable computer then look elsewhere.
2) I like the customized view display and its layout, which is easy to read even during bumpy rides on unpaved roads.
2)The size of the computer is appropriate for its functionality and it is definitely smaller than corresponding Garmin 305 model.
3) I also like the fact that sensor batteries are standard types and can be changed by myself.
4) Accuracy of the computer is reasonable, I did not find more than 2% difference comparing the distance and elevation profiles registered by ROX with topological maps.

CONS:
1) I really don not understand why cadence is not part of logging memory. According to me, this is one of th top 3 parameters you want to monitor during a ride, together with speed and HR. It is quite ridiculous that Sigma is capable logging the air temperature but not the cadence. Was this designed for cyclists or meteorologists?

2) The sensor attachments are rather clumsy , which has been typical even for older Sigma models. Using o-ring combination with double-sticky foams is a cheap solution in this price range. Need to be frequently adjusted especially if you transport your bike in a car and take the bike wheels off.
3) This computer can be used only when attached to the bike base. Once you use it standalone, no HR can be recorded (elevation is the only variable monitored continuosly ) which makes it not usable for runners.
4) The elevation sensor is OK but since it is based on the air pressure (no GPS data calibration) it makes it very sensitive to the atmospheric pressure variation. I noticed that the elevation of my house registered by the computer varied by more than 20 m (60 ft) in a period of ~2 hours. So calibration before each ride is a must.
5) The uphill/donwhill grade measumeremnts are significantly time lagging and they show right values only if you remain at same slope at least for 15-20 s. It means that if you ride in a terrain with lots of short uphills and downhills, the computer will show +6% climb only after you passed the peak of the climb and are already on the downhill section.

Bottom line: It is a good cyclocomputer that reports all relevant variable that most people will need during rides. I find it usefull for improving my ride in terms of adjusting cadence and gear ratio to achieve optimum HR rate range and ability to log and compare my performance stats during short cycling season here in New England.

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