Just wondering on the part that is on the bike fork that runs off 12v in my case. How low a temp can those things transmit too? I'm in Toronto and lowest I believe temp we have is -36C windchill but that is rare. We're like around -15C windchill so far this year.

Thanks for any help.

Wind chill isn't much of a factor for things that don't sweat or for machinery. The actual air temperature is what counts. Where I commute 25F is considered a cold morning and my wireless computer still works.

The only thing that might cause an issue is the battery not working as well, or the magnet freezing up.

Computers don't have much of an issue with cold.

The (cheap, wired not wireless) bike computer I used to use would become progressively harder to read as it got colder. I think it was just the lcd display fading out due to cold, it seemed like the computer was still working. It was pretty much unreadable below freezing as I remember. The cold didn't do any permanent damage, after the unit warmed up again it would work fine.

Ditto on all, if it gets too cold the battery will become weak combo that with LCD display below freezing and it will appear that the computer is no longer working. But cold weather will not damage it any. My cat eye wireless that finally died last year from getting stepped on spent an entire winter frozen in water after it fell into a bucket in my shed come spring i let it dry out and it still worked

Actually certain types of electronics do falter at lower temps... every "computer" has a small oscillator chip inside that is somewhat sensitive to lower temps. A bit of body heat may help... if you can remove the unit and warm it up a bit, it may start functioning.

LCDs also can become quite "dim" in cold temps, and may black out from excessive heat or direct sun exposure.

Batteries are a chemical process that requires some moderate temp.

Yeah if it's cold enough... stuff may not work.