stephen@fibre-lyte wrote:Tbh, I don't get involved too much with the repairs at our place, John (our special projects director) does them all and his workmanship is better than any I have seen. I've never seen him scrap a frame due to a handlebar cracking a top tube. To give you an idea of his talents he's built a time trial frame, a time trial wheel set and two mountain bikes from scratch as well as a hill climb car and a carbon tubbed sprint car that's currently being built.
Some things are better to be scrapped and not repaired, regardless of the skill and I am sure John has plenty of skill, respect.
Top tubes in particular are so thin these days that with higher mod fibre and a lower ILS resin the delam travels. If the majority of the tube is delaminated there is no sound material to scarf a repair into. Sure it may be technically possible to repair, however it gets to a stage where it is not practical or cost effective. This is why we use ultrasound to verify the condition of the material before deciding if a repair is practical.