Similar topic http://xbhp.com/forum/topic.bike?TOPIC_ID=6417
I own a Sigma Bike Computer (BC1600)

or also called as a Cyclometer. This is basically used by bicycle riders, but since it has a caliberation upto 199kph, we can use it on our bikes.
Functions
1) Current Speed
2) Average Speed
3) Average Speed & Current Speed Comparison (indicates whether current speed is lower,same or higher than the avg speed)
4) Max Speed
5) Ride Time
6) Odometer
7) Dual Bike Memory
8) Trip Up/Down
9) Clock
It consists of
1) a magnet which is fitted on the spokes/alloys
2) a sensor/pick up
3) a holder
4) the bike computer

Fitting:
Very easy to fix up. The magnet is fixed on the alloys ( I lost my magnet and I have used one from a speaker now and it works fine).
The sensor is fixed on the fork using a elastic band.
The holder can be fitted on the handle bar and the wire to the senser routed on the fork.
The computer can be fitted and easily removed since it fits using a push and turn lock mechanism (somthing like a normal bulb)





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