I've seen RC planes with a single Pulsejet engine get up to between 200-400km/h.
The engines are gonna be pretty small though so that they can fit on the bike, and overall I think that they would be able to produce quite a amount of thrust since there are six of them.
So far, so good. Not been keeping up with the thread? We're only doing a post each per day at the moment, so it's slow, but the writing is good, for all that.
Fair enough, but I did a measurement on the bike, and it turns out that it would actually be around the size of 4 meters. And btw, it's gonna have six pulsejet engines, wonder how fast it can go.