Originally Posted by
jolly_ross
If you're cycling in cold weather then you should always use an analog watch to measure your time. The increased air density slows down the hands - allowing you to cycle further in a given time - evening things out.
The miniscule difference the air density will make on the slowness of the hands of the watch will not compensate for the added aero drag while biking.
The temperature of the cogs inside the watch will be lower and this will add some friction ... but even this will not suffice.
Luckily ... the coldness of the little battery inside the watch will drop the voltage of it significantly, resulting in a much slower watch!
You need to use pre-quartz watches for this to work though.