Ive owned this 16x for over 6 months and have put over 70 disappointing miles on it without being able to unlock speed limitation. Ive tried every app i could find on the net. it seems to be set in the app untill i ride it. the fastest ive gone is 13.5 mph. I upgraded to this wheel from a 16s which i loved but one day it burst into flames and was a total loss. I was excited to get a newer faster wheel and im hoping someone can help me out here so i can enjoy this one too. any ideas im willing to try anything.