Speedometer (through 2016)

This is the old mechanical speedometer, well-known for being not especially accurate, for sometimes losing 1,000 km, and for showing mph but reading distances in kilometers.

And it's way better than nothing, and not very expensive.

If your old one broke and you replace it with a new one, please keep your old speedometer in the trunk as a record of how many km the bike was ridden before you replaced it (or before it stopped counting the klicks).