Wireless speedo problem

[redste]

I have a cheap Bell wireless computer on my road bike. Every now and then the speed jumps for no reason. It has shown me reaching a top speed of 48.2mph and there is no way I could every do that!!!
Am I getting interference from other things or is it a problem with the computer?
It happens on almost all trips I make.

 

[ianrauk]

Yup, my wireless computer does the same.
I have pinpointed it to a set of traffic lights on my commute

 

[compo]

It could be the computer but more likely you are getting false triggering from some external source. Try and see if there is anything common when it happens such as a taxi, sensor controlled traffic lights or some other form of interference. Maybe an office with wifi, it could be anything to be honest. Even cars transmit all manner of signals.

 

[redste]

I'll keep an eye on more closely from now on. Still keeping my eyes on the road obviously!

 

[addictfreak]

Can also happen when using flashing bike lights. My old cateye wireless used to give high readings when I used my Knog front light.

 

[coffeejo]

I once looked down to check the time and discovered that I was speeding along at 65mph. What's even more impressive is that I was stopped at a red traffic light at the time.

 

[SatNavSaysStraightOn]

You're not trying hard enough.
My OH gets top speeds of +190kmph out of his wireless cyclo comp - usually once a week or so.

 

[wisdom]

Below zero temperatures can effect them as well

 

[Supersuperleeds]

My satmap tonight showed my lowest point as being -600ft, yes minus 600ft!

 

[ianrauk]

My satmap tonight showed my lowest point as being -600ft, yes minus 600ft!

Didn't fall into an old mineshaft did you?

 

[SatNavSaysStraightOn]

My satmap tonight showed my lowest point as being -600ft, yes minus 600ft!

Can I raise you one having actually cycled at -212m (-696 feet). no gps to prove it though! (undersea tunnel before anyone questions it!)

 

[andrew_s]

Nordkapp?

 

[SatNavSaysStraightOn]

Nordkapp?

yep... falls under the category, done it once, don't need to do it again!

 

[PatrickPending]

Electromagnetic interference, a set of traffic lights I used to ride past on my commute set my Sigma wireless computer off - said I'd done 190KMh on my commute - that computer broke a while ago. I have wired computers on my commuter now but do have a VDO Z1 wireless on my Ti bike which I've had no problems with.
Electric fences used to set it off too, the kind to keep sheep in.....