Originally Posted by
rseeker
So I need to replace my frame. It's old, it's aluminum, I'm a big guy, I like to stand up on hills and work it, and I can see cracks forming.
If you can truly see "cracks forming" in an aluminum frame, stop riding it
NOW. Aluminum doesn't fail gently, and those cracks will fracture catastrophically sooner rather than later. You don't want to be on that bike when it happens.