Bought a 2026 Cannondale Topstone (aluminium) in Barcelona last month. The shop assembled it and packed it into my EVOC bag for my flight home. They didn't fit a rear dropout spacer/protector in place of the wheel. It arrived with the rear triangle bent, dropouts no longer coplanar, thru-axle won't pass through both sides, wheel won't seat. A local shop measured the dropout misalignment and confirmed it's out of spec.
(Side note for context: the shop that packed it is refusing responsibility, I'm chasing the airline claim and Cannondale crash replacement separately. Not what I'm asking about here.)
What I'm asking about: the mechanic here says he wants to fully disassemble the bike and heat the frame to reshape and correct the alignment. Is this a good idea?
If straightening is my genuine last resort (frame is scrap otherwise), is cold alignment with proper frame tools meaningfully safer than heating? Or is any realignment of an alloy rear triangle a bad bet?
Realistically, is a rear triangle that's been bent, then realigned, ever safe for hard/technical riding, or only good for gentle/town use afterward?
Anything I'm missing?
Appreciate your help.
by tispis
3 Comments
Your bike shop is a mob of morons. Absolutely, absolutely not. Never in your life go back to them.
No, if they packed it wrong they owe you a frame. aluminium hates plastic deformation
That account of bend, it’ll almost certainly crack it if you cold set it.
Heating it will mostly destroy the heat-treatment of the alloy, and the paint. (Looked like their C2 alloy is a variety of 6061, so almost certainly heat-treated already.)
I personally wouldn’t ride an aluminium frame that’d been straightened. And wouldn’t straighten one for anyone.