È possibile aumentare la lunghezza di un canotto forcella tapered in carbonio (tagliato troppo corto) di 5-6 cm ?
I regularly lengthen fork tubes, but not by more than 3 cm, so that the stem collar, once mounted on the bike, hooks at least partially onto the original tube.
With a 5-6 cm extension, this would not happen, and all the bending and twisting forces would be transferred entirely to the rebuilt part. This is not advisable, as this is a critical area of the bike where you cannot run the risk of causing a break, however remote the possibility may be.
My opinion, therefore, is not to go for such a significant lengthening, because it is not worth the effort, either in economic terms or in terms of safety.