so far i have hit 108mph on the 600 and 1000. i am changing gearing to try to hit 120mph on the flats. before i built the bikes i thought i would be the last out of the hole and have to play catch up the whole race but thats not the case. these bikes launch just as hard as very built banshees, and then once i get going they just take off, the 600 revs to 16000 and the 1000 is 12000 and i have had both pegged.