Originally Posted by
Andrew R Stewart
Well there is bracing already in the form of butting and lugs...
Andy.
Thank you for your answer Andy. Giving an research on google about that, I have seen some people done this kind of things on their bicycle, but most I've seen on motorcycles who need load more weight than was designed. I agree with you that a brace can actually just move the tension point and not reinforcing at all.
By the same time, on a bike shop website, I observe they sell a type of trekking bike in two variants: one for over load and the other just normal. The bikes are the same, just the only difference seems to be a welded brace between top tube and fork tube.