After Careful experimentation...including a hypothysis and a Conclusion...the front tire starts to come off the ground at 9-10 ish, haha. I dont run my bike super hard or anything, I wouldnt even say hard yet so I dont know...I feel bad for the bike reving this much...or is that ok for it...as long as its not held there for lengthy periods of time. I keep trying to pull up like on my bike(pedal LoL) I should definitly stay away from that or?