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Ive got a sigma sport 300 and need to know how far away from the centre of the wheel the magnet goes so that my speed reading is correct thanx

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You can place it wherever on the spoke you like, as long as the distance is less than 5mm between the magnet and the sensor.

Posted on May 19, 2011

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Sep 29, 2014 | Sigma Sport Cycling

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Sigma bc 12.12 stopped showing speed, other functions are still working.

Looks like that is a wired wheel sensor. Make sure the magnet lines up correctly with the wired sensor and is close enough to it. Also check for broken wires. If both those are OK and still no speed reading then the sensor is probably borked.

Apr 16, 2014 | Sigma Sport Cycling

1 Answer

Not registering speed

Check your magnet is aligned with and adequately close to the sensor, and that the sensor is not too far from the computer. Also check batteries. Try taking the computer off the bars and moving it nearer to the sensor to see if it is a range problem.

Oct 14, 2013 | Sigma Sport BC 1009 STS Wireless Computer

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Can the spoke magnet go on the rear wheel sigma bc 906

You should be able to use it on your indoor trainer. The Sigma will need a wheel diameter callbration to give correct readings.

Jan 29, 2013 | Sigma Bc 906 Computer

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Syncing with Sigma BC1009

Had this same problem and nothing worked after trying everything I could think of. Speedometer would never display a blinking 0 (just stagnant). Turned out the computer mount on the handle bar was turned around backwards. The sigma letters go towards the front of the bike. Placed the device in the mount, the 0 started blinking and sync'd up with sensor. Finally works!

Sep 13, 2012 | Sigma Sport BC 1009 STS Wireless Computer

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Sigma BC 1609 Cadence Bicycle Speedometer reads my movement much slower than I am actually going. E.g. moving about 15, reads as 5 mph.

I had the same problem. It is caused because the mount is facing the wrong direction and your computer is swapping speed and cadence. 5 mph would mean 63 RPM of the wheel which probably what your pedal is actually doing. The wheel is actually turning at about 3 times that rate so if you check your cadence it is probably maxing out at 180 even though that wouldn't be possible.

To fix this, just twist your mount 180 degrees on your handlebars or stem and try again. That way the computer is correctly lined up with the mount.

Mar 10, 2012 | Sigma Sport BC 1609 Cadence Wired Computer

1 Answer

My Sigma BC 1106 bike computer won't register the movement of my wheel. I spin the wheel and the speedometer stays at zero. I changed the batteries, the magnet on the spoke is still magnetized and I...

I had this problem as well. What I found was that the transmitter path from the magnetic sensor to the computer is very narrow, a 15 degree cone. Reposition your computer to fall within this cone. It should pick up the signal.

May 08, 2011 | Sigma Sport BC1106 Dts Wireless Bike...

1 Answer

I have set the computer up, i think but its not registering when i ride my bike. Am i missing something or not set it up correctly the batteries are fine in both parts? can somebody help

If it's mounted correctly the display will indicate a speed whenever you rotate the wheel with the sensor and magnet on it. The magnet needs to pass within about 2-3 mm of the sensor.

Jan 19, 2011 | Sigma Bc 906 Computer

2 Answers

The speed mph varies widely even when the bike is going at a consistent pac. The computer will read 3 mph and then jump to 20 mph which the bike is just rolling without a big variation in speed.

The most likely cause is that the front wheel is a little loose. This causes the magnet on the spokes to pass the receiver on the bike frame at different distances. If it passes at more than 1 mm it won't be read so it is probably only reading some of the rotations of the wheel. The solution is to loosen the wheel and tighten the nuts inside the forks a little. When it's at the right tightness the weight of the wheel valve should be just able to turn the wheel until it reaches the bottom with the wheel raised off the ground. There should be very little or no sideways movement in the wheel. Also ensure that the magnet is not moving.

Jul 19, 2010 | Sigma Sport BC506 Bike Computer

1 Answer

Lost manual

WHY? Accuracy. Most of the Harley-Davidson motorcycles I've owned have had fairly accurate speedometers, but it's very common for the import bikes to be off by a considerable margin; the V-Strom is no exception. Realizing that my speedometer was reading higher than my actual speed, I cranked up my trusty handheld Etrex GPS and found that the stock instrument was off by a consistent 7.7% (when the speedometer reads 70 MPH, actual speed is 64.6 MPH). I figured that I had four options to deal with the problem: 1) ignore it, 2) watch the speedo and "guesstimate" my actual speed, 3) install an auxiliary speedometer, or 4) install a correction device.
Options 1 and 2 didn't much appeal to me. Installing an auxiliary speedometer is certainly a viable option, as some bicycle speedometers are very reasonably priced and can be calibrated to function with respectable accuracy. I was surprised to find a newSigma Sport BC500 unit on eBay for only $10.95 plus shipping, so I decided to check it out.
SERVICE. N/A. The eBay seller shipped promptly.
INSTALLATION. A piece o' cake, and one that could be accomplished by just about any owner. While the installation instructions are for a bicycle (go figure) it's not difficult to modify them for use on a motorcycle. The first order of business is to measure the circumference of the front tire and program the results into the unit; the measurement must be precise so that the readings will be accurate. The unit fits into a base that is easily attached to the handlebars with a rubber O-ring and a lead wire that is attached to a magnetic pickup. You'll need to find a way to attach it to the lower fork leg; since I only planned to use the unit for a short time I secured it in place with a heavy rubber band. It also comes with a magnet that's designed to attach to one of the bicycle's spokes. Since it obviously won't work on the V-Strom's front wheel another magnetic source must be used. Off to the local Radio Shack to pick up a pair of tiny rare earth super magnets ($1.89/pair, part #64-1895). These magnets, though very small--about 1/8"--are very powerful. I fit them into the head of one of the front brake rotor bolts, where magnetic force held them in place nicely. Here's how things looked;
sigmasportpickup.jpgRESULTS. Pretty darned good. Because the magnetic pickup detects only one pulse signal per revolution (the V-Strom's speedometer registers about 80 signals per revolution) there is a small lag in displaying the speed but at constant speed it's very accurate.
Worth the money? Absolutely. I don't plan to use the unit permanently, but it's an incredibly inexpensive way to provide an accurate speedometer reading. At less than $20 for the entire setup it's a heckuva deal!

Jun 15, 2009 | Sigma Bc 906 Computer

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