My centurion hybrid bike has a front lock-out suspension and 135mm rear drop-out. The only thing that I could definitely tell that it is not a mountain bike is that it has 700x35 tires and 622mm x 18mm wheels on. The weight however is 12.8kg (28.2lbs) heavy. Due to the fact of weight, I'm sad. Isn't that pretty much what a normal mtb weighs? To me it seems like a mountain bike on bigger and skinnier wheels/tires, that's it. What do you think?