Sigma Sport ROX 9.1 Triple Wireless Computer, Black

I was replacing a Polar - I decided on Sigma Rox 9.1 after reading the manual online. I was hesitant but hopeful. It took me a while using it to get the hang of it, but gradually I came to understand it and like it. It's not intuitive off the bat, but once I got a feel for the features, I understood how to make it do what I wanted. It's a very well thought out design, making it very simple to use (after some practice) while maintaining a lot of functionality. The heart rate strap seems very good with no drop-out problems. Software is good for logging rides and Rox unit set-up. I also like the fact that ALL batteries are user changeable.My caveats ---I really wish there was Linux software.It will NOT log heart rate alone, it must have speed (or cadence?) active to log. I wish it could also do heart only, but it's not a deal breaker.The speed sensor fork mount can be a problem. It has rather large gutters for optional rubber band mounting. On my large carbon forks, I can barely angle the sensor to keep the head and gutter out of the spokes. The instructions are afraid you will have too big a gap, whereas I had almost no gap anywhere on the fork. After some thought, I did manage a good setup by mounting the spoke magnet reversed with the magnet to the wheel center. Because the sensor is so close to the spokes, it still is in the correct range and works flawlessly. The gutters are kind of a neat idea for easy bike changing, but got in my way.Summary - after 200 initial miles, I am very happy I bought it.

Got really tired of trying to get my Polar CS300 to sync to PC. Never worked. So I wanted to find a high featured computer with simple and reliable interface with PC. The Rox 9.1 exceeded expectations. While the software is a little quirky (error messages occasionally) it has never crashed. Overall, the app is great. A ton of data. You can use it all or simplify with preferences or toggle on/off easily. The simple USB connection is effortless and reliable. It took a while to get comfortable with navigating the cycle computer but now feels natural. Friends had recommended Garmin, but for me, I just do not see a need for GPS (I use a free, sport app on my phone). I have not tried the Ghost feature but will as soon as I log my previously achieved personal best. I look forward to that challenge on individual rides. Cadence, speed and heart rate sensors all accurate based on previously validated data. No need to send in your device for a battery replacement (or toss the Polar speed sensor when battery low because it is sealed and unserviceable). All Sigma sensors use standard coin cell batteries. Support has been responsive. NOTE: Mount Night Rider batteries no closer than 6" from computer or the computer will not receive signals properly from sensors.Discovered this through trial and error.

Don't believe the other reviews; this truly is the Rox 9.1 for ~$50 cheaper than most other sites out there.Package arrived in only two days.I am new to the Sigma line of computers, but I've been very happy with it so far. Large display with everything you need on it: HR, Cadence, Distance, and Speed. The power function is somewhat delayed when hitting hills or when accelerating, but it's still a fun, additional way to gauge performance without investing $700+ in hub/crank-based power meters.The product manual was a must in order to figure out how to log rides and get 'power' graphs.Overall: great value, timely shipping, and terrific product.

When I began researching a bicycle computer, I found that the Sigma Rox 9.1 offered all of the features I wanted (speed, altimeter, incline), as well as a plethora of others (Heart rate, power, back light, software for analysis, et al) Also, Sigma is the original brand for cycling computers and a German company to boot so I figured precision was a given. This computer is by no means inexpensive compared to others, but is still a lot lower in price compared to some with similar features like the Garmin units I looked at. That being said, I really wanted to like this computer but:1) Speed and distance are way off. The computer does allow for a wheel circumference setting. After calculating mine and riding, I had to add over 100 cm to actual tire circumference to display the proper speed and distance. I verified this discrepancy by use of a Garmin 405CX GPS unit during several rides over the course of a month. It also takes a few seconds to display the current speed (although I believe the slight lag may be expected in a wireless computer.)2) Sensors start and stop working intermittently. The speed sensor worked well once it was aligned properly (save the problems listed above). However, the heart rate monitor and the cadence sensor both stopped working and refused to come back on during several rides. I had to stop and try to realign them but it made no difference. The sensors would eventually start registering after several minutes.3) The altimeter feature is nice and it allows for recalibration to compensate for air pressure changes. However, the incline does not display in real time. It also takes several seconds to register. If an iPhone or android phone can be used as a level with their internal accelerometer, then I would think that the same basic principle could be used for the incline feature. Also, at a $200+ price point, I think that a computer should display an incremental incline readout to at least a 10th.4) The software is difficult to use and does not update settings to the computer as it should. I would apply settings with the unit docked, but it never registered any changes. The software would tell me to "disconnect the computer for a while" to affect the changes. How long is a while? I would come back the next day and still no updated settings.All in all, the Rox 9.1 worked fine as a speedometer / odometer (once I tweaked it) but I could have spent much less for that feature.