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Frame crack
NB: Originally posted elsewhere on the Global Riders Network and appears via syndication.
Interested in any views / recommendations on the safety / feasibility / cost of repairing a badly cracked aluminium frame (see pic). And yes, I should have been using a longer seat post.... 
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What brand, model is it? So others can avoid the same fate.
Could probably be repaired. If you have the seatpost long enough there wouldn't be a huge amount of load there. I reckon it would be a couple of hundred bucks to fix.
Take it to Stan at BA for an opinion. With a long enough seat post it should be fine. Additional reinforcement like a carbon wrap may be needed. Which bike?
carbon wrap ?? its an alloy bike by looks of it ..
how far was your seat post in .. surely if 70-100mm min insertion this wouldnt of happened
I've done similar in the past. Needs a specialist welder. The ones who work on aircraft are best as light weight aluminium needs a lot of care. You'll end up with some sort of sleeve. It won't look pretty but will save you from throwing it away.
It's a Bianchi Jab 7500 - but I don't think it is so much a problem with the bike as my stupidity in not getting a longer seat post for it.
mxracer,Lach has already stated that his seat post insertion was incorrect !
..yeah its aluminium and you have spotted the problem. Was running about 70mm inserted, but about 30mm less than the recommended minimum on the post. Mind you, I've done similar with all my bikes over the years, but pushed my luck a bit too far with this one. The seat post looks fine by the way....
should be able to effect a 'repair' if you just want it rideable again. Like fatboy said, it won't be pretty but it'll be functional.
For the sake of being nosey.... how much post was hanging out and how long did it take to fail? Hardtail or dually?
Seat stays welded to the seat tube, guessing a dually
Seat stays welded to the seat tube, Guessing it's a hardtail
Yeah, easy fix and fairly straight forward, but would need a gusset for strengthening. I've done a few of them recently.
Gripsport in Melbourne. They are the only choice really. But highly reputable.