Well I have had a Tekno 4x4 for 2 months and finally got to run it for the first time and didn't even make it 3 mins and a 5x11mm bearing completely exploded.....So I am wondering are all these bearings lets say" not so good" or do you think I was the lucky winner of the bad bearing.....Should I look into buying a bearing kit for it...Have any of you had problems with keeping bearing in them...I am hoping it was just one bad one....but now my truck is a hybrid cause all they had was Losi bearings.....