I use a Spybike (<a href="http:&#x2F;&#x2F;www.spybike.com&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.spybike.com&#x2F;</a>)<p>Unfortunately, the company seems to have gone bust.<p>They have stopped responding to emails - and their tracker is 3G only - many countries have started to shut down their 3G GSM trackers.<p>There was one on Kickstarter before called the &quot;Bike Spike&quot; - however, it turned out to be a fraud, and the creators ran away with backer&#x27;s money (I didn&#x27;t back them).<p>The Spybike isn&#x27;t bad - the big issue is getting a GPS lock in urban areas, long GPS lock times from a cold-start, and battery life.<p>Definitely keen to see what else people are suggesting these days.