I've had a cateye wireless computer (cordless 7, from the pictures I found online ...?)on my bike for a while now, and in general it seems fab - an improvement on its predecessor, whose sensor was carefully designed to fall off any bike with non cylindrical forks!
Most of its readings (current speed, distance) etc are pretty obviously correct, but after any ride my maximum speed can be anywhere from 60 to 90 mph. While I like to flatter myself, this is just silly. Does anyone have any ideas why this might be happening? I cycle mainly in London, so there's plenty of scope for interference, but I cant think from where.
Does anyone have any ideas why this might be happening? I cycle mainly in London, so there's plenty of scope for interference, but I cant think from where.
Ben
It's caused by magnetic traffic control loops in the road. The sensor picks up one signal from the magnet on your spoke and then another immediately after from the loop in the road. Hence the distortion in your speed.
Most of its readings (current speed, distance) etc are pretty obviously correct, but after any ride my maximum speed can be anywhere from 60 to 90 mph. While I like to flatter myself, this is just silly. Does anyone have any ideas why this might be happening? I cycle mainly in London, so there's plenty of scope for interference, but I cant think from where.
I used to get interference with a heart rate monitor from one-man-operated buses. Every time one overtook, the heart rate would drop to zero and remain there until it was fifty yards up the road. Whereas my pulse rate was actually soaring, because 99% of bus drivers are idiots who have no conception of how fast cyclists can move.
"cyclist" <whatever> wrote in message "]news:[email hidden]...
Quoted message said:
Quoted message said:
Does anyone have any ideas why this might be happening? I cycle mainly in London, so there's plenty of scope for interference, but I cant think from where.
Ben
It's caused by magnetic traffic control loops in the road. The sensor
picks
Quoted message said:
up one signal from the magnet on your spoke and then another immediately after from the loop in the road. Hence the distortion in your speed.
Ah, so that explains why I once recorded 72mph as I stopped at traffic lights! I thought it was because I'd caused the wheel to rock back slightly as I stopped, just as the magnet passed the sensor...
"Dave Larrington" <[email hidden]> wrote in message news:<[email hidden]>...
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Ben Barker said:
Most of its readings (current speed, distance) etc are pretty obviously correct, but after any ride my maximum speed can be anywhere from 60 to 90 mph. While I like to flatter myself, this is just silly. Does anyone have any ideas why this might be happening? I cycle mainly in London, so there's plenty of scope for interference, but I cant think from where.
I used to get interference with a heart rate monitor from one-man-operated
Funny you should say that: I got 65mph coming in the back entrance to work just under the ECG unit. Does this mean we have the same effect on this equipment when we ride past? (Mobile phones/Bicycles to be switched off in this hospital)
