C
Chris Malcolm
Guest
PhilD <[email protected]> wrote:
> Pete Biggs wrote:
>> Is yours a wired a cordless computer?
> Yes, and yes. I have separate computers for different bikes. I have
> had problems with both sorts, seemingly by the same cause(s). I admit
> though that wireless types give more spectacular erroneous readings.
I've had a cheap wired VDO for about 12 years. I export the figures
from it into a spreadsheet at least every week, just so I can plot how
my average speed is dropping as I age, so I see the recorded max speed
regularly. I see an implausible figure about once every two years, and
it's never wildly implausible, just something like 40 mph that I'm
pretty sure I didn't do. I put it down to pushing the bike back and
forth over the "click" position while parking. The sensor is a reed
switch activated by a passing magnet which is a form of activation
that has an inherent mechanical hysteresis if of good quality, i.e.,
you can't make it jitter on and off by having the magnet wobbling a
bit in a marginal position. It seems to work reliably without being
adjustment sensitive because I sometimes notice that it's been knocked
badly askew, and yank it back into position. It simply works reliably.
It's the third bike computer I've owned. It's been so vastly much more
reliable and trustworthy than the previous two that if I ever replace it
I'll stick with VDO.
--
Chris Malcolm [email protected] +44 (0)131 651 3445 DoD #205
IPAB, Informatics, JCMB, King's Buildings, Edinburgh, EH9 3JZ, UK
[http://www.dai.ed.ac.uk/homes/cam/]
> Pete Biggs wrote:
>> Is yours a wired a cordless computer?
> Yes, and yes. I have separate computers for different bikes. I have
> had problems with both sorts, seemingly by the same cause(s). I admit
> though that wireless types give more spectacular erroneous readings.
I've had a cheap wired VDO for about 12 years. I export the figures
from it into a spreadsheet at least every week, just so I can plot how
my average speed is dropping as I age, so I see the recorded max speed
regularly. I see an implausible figure about once every two years, and
it's never wildly implausible, just something like 40 mph that I'm
pretty sure I didn't do. I put it down to pushing the bike back and
forth over the "click" position while parking. The sensor is a reed
switch activated by a passing magnet which is a form of activation
that has an inherent mechanical hysteresis if of good quality, i.e.,
you can't make it jitter on and off by having the magnet wobbling a
bit in a marginal position. It seems to work reliably without being
adjustment sensitive because I sometimes notice that it's been knocked
badly askew, and yank it back into position. It simply works reliably.
It's the third bike computer I've owned. It's been so vastly much more
reliable and trustworthy than the previous two that if I ever replace it
I'll stick with VDO.
--
Chris Malcolm [email protected] +44 (0)131 651 3445 DoD #205
IPAB, Informatics, JCMB, King's Buildings, Edinburgh, EH9 3JZ, UK
[http://www.dai.ed.ac.uk/homes/cam/]