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Sigma ROX 9 Computer with Heart Rate and Cadence Counter

by Sigma

RRP: £249.99
Price: £228.73
You Save: £21.26 (9%)
In stock.
Dispatched from and sold by Adventure Northumberland.
2 new from £228.73
  • Wireless cadence, speed, and digitally coded heart rate
  • Two wheel size adjustable with automatic recognition of a 2nd bike
  • An extensive set of Heart Rate, Time, Temperature and Altitude functions
  • Individual memory analysis with Comparison of 2 individual memories
  • Bike computer settings can be managed via PC
  • Synchronisation manager: Allows rides to be downloaded via USB to PC
  • Software Data Center: Provides graphical analysis of each downloaded ride

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Product details

  • Product Dimensions: 20 x 17 x 7 cm ; 100 g
  • Boxed-product Weight: 621 g
  • Delivery Destinations: Visit the Delivery Destinations Help page to see where this item can be delivered.
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  • Item model number: 09170
  • ASIN: B001FWYIR8
  • Date first available at Amazon.co.uk: 28 Nov 2008
  • Average Customer Review: 3.9 out of 5 stars  See all reviews (7 customer reviews)
  • Amazon Bestsellers Rank: 226,577 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
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Customer Reviews

3.9 out of 5 stars
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Most Helpful Customer Reviews

9 of 9 people found the following review helpful By G. Y. Ritchie on 20 July 2009
I made this purchase because I wanted more information about my cycle rides than was being provided by my previous combination of heart rate moniter and basic computer. in addition to basic functions, I was really interested in generating elevation profiles of my rides, and getting information about inclines. I had no previous knowledge or experience of Sigma products - the Rox 9.0 was a recommendation on an online forum. In this review I'll say a bit about the unit and setting it up, the heartrate functions, the user friendliness of the computer, and the software.

First of all, the unit which attaches to the bike is about half the size of a mobile phone. Certainly not cumbersome - I was surprised to read another reviewer complain about the size. The display shows three horizontal lines of information. The top line shows current heartrate, elevation, incline, and cadence. Helpfully, it is possible to zoom in on just one of these. If you are doing an interval and want to keep HR high then you can choose to have this shown in large size with the other values hidden. The second line shows current speed and an indication of whether this is above or below average for the trip. On the third line the user can scroll through a range of information including distance, trip time, average speed, total elevation etc. Setting up the unit was quite straightforward. I was pleasantly surprised that I had no trouble in getting signals from the speed, cadence, or heart rate sensors. The only time I have failed to pick up signals the problem was solved by wiping the back of the unit before reattaching it to the bike. The sensors can be attached by either O-rings or cable ties. I have used the unit on two bikes. On an old steel bike there was plenty of room to position the cadence sensor.
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2 of 2 people found the following review helpful By BeeKeeper on 9 Mar 2010
This is a well made piece of kit. The HRM is excellent. It never fails to find your HR and only on a very very few occasions does it lose it but this is due to the chest belt slipping down. But once you get used to wearing it, it no longer becomes a problem. The HR is clearly displayed and is good that it has 3 zones which you can set. But this is where the excellent comments end.

The computer would not keep time on or off the bike. It started losing about 6 then 20 minutes a day then went up to 3.5 hours which was real pain having to reset before each ride. On a turbo session of 40 minutes the clock would lose 6 minutes! Also on long rides this would affect all functions involving time. So I could not trust it and ended up using my basic trusty Cateye Mity 8 along side instead. However the HRM of the Rox continued to function fine. Well it appeared to.

The cadence function is good, at least it was until after about 6-8 weeks the computer kept dropping the signal. I replaced all batteries but cadence would still drop to zero after about 10 seconds.

Also the temperature readout seemed to be rather high. So I purchased another temperature device and found the Rox to be over reading.

So having had enough I sent the computer back to Sigma, just the computer, not all the other gubbins to keep postage costs down. 3 weeks later I received a whole new replacement unit. I set this up and have not had any problems with the current unit. It picks up and holds cadence and most importantly keeps time, although I have to say that as I got the replacement at the end of the season in October I have not had much chance to use it as I don't use it on my everyday commuting bike but my road bike during club and training rides.
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Verified Purchase
On paper, this unit seems very good, lots of functionality and when it works, it does the job - just about.

However, since buying this I have had to return the unit back to Sigma in Germany a couple of times due to faults.

Here's the list of outstanding issues I have with it:

- Incompatible with some bike lights (that use PWM for brightness control) - Speed and heart rate is affected. Had to mount the bike computer and light as far away as possible for it to function.
- Computer or Cadence sensor keeps thinking it's a Bike2 speed sensor, despite sending it to Germany to get it fixed. It worked for a while but the same fault is back and it's now out of warranty.
- Timekeeping is not accurate, must unplug from bike when not using it by twisting it and reset time manually if used in the PC cradle for any length of time.
- Speed sensor is affected by cold (less than 0C) conditions
- Altitude is inaccurate.
- Can't set temperature to Celcius and have Miles at the same time.
- Log start button difficult to press as you have to hold it for a few seconds for it to start - difficult with cold hands.
- Can't have heart rate and cadence zoomed in at the same time.
- Some functions are slow to respond. Takes a couple of seconds to react to say setting the altitude to a present and setting another function.
- Limit to number of logs that can be kept regardless of how much memory is used (maybe 50? Have yet to determine.) If too many logs are recorded, you get an error in the software when trying to import the logs. Must delete log entries manually to fix.
- Does not record cadence by design. Sigma say this is due to the memory of the unit, which is rubbish as can just reduce the log time interval for instance.
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