Exploding bike seats? <a href="http:&#x2F;&#x2F;m.youtube.com&#x2F;watch?v=ZYlBT1d_GWo" rel="nofollow">http:&#x2F;&#x2F;m.youtube.com&#x2F;watch?v=ZYlBT1d_GWo</a><p>Seriously though, GPS receivers and GSM radios are a few dollars each these days. Seems like an easy thing to hide in the frame (of course a thief could still part out everything except the frame)