Originally Posted by
Notso_fastLane
Usually if it's a speeding ticket, your best defense is that cycles aren't >required< to have a speedometer, so there's no legally obligated reason for you to know how fast you were going, regardless of whether you actually have a cycling computer or not.
* You aren't allowed to speed (whether or not your speedometer is working properly or present).
* You might be legally required to have a speedometer in a motor vehicle.
It's two separate offences.