As many adult XC mountain bikes have droped their weight to about 25lb these days compare to 30lb+ a decade ago, just why are kids bikes remain so heavy? I compared some good brand 20"wheel kid bikes that weight in +/-26lb; it's heavier than my adult 18" frame Rocky Mountain Hammer!!! Why??? Searched many web sites and couldn't find one decent in North America! Can anyone suggest the best 20"-wheel kids bike? Would it be worth to built up a kid bike for a 6 year old?