Hmm, trip computers are fun when you are new to cycling I suppose. Look Ma, I averaged 25 today. Maybe you need one for recording the distance when you are training, but I've found that recording the time you spend in the saddle is just as effective. In the last year I've come to the conclusion that I don't need one at all - mine's been broken for a while. Oh and regarding the 300km/h spec. If you give up cycling, your tip computer will come in handy for recording your average speed while blasting along on your superbike