Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 2 Post(s)
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Yes, it is corroded, probably from being stored outdoors, or in a very damp basement. And, Yes it might crack one day, but that could be years away.
In any case, it isn't dangerous because a seat tube failure there isn't likely to cause a crash. It's most likely to crack when climbing a steep hill with lots of pedal pressure, in other words at very low speed. I'd have no problem riding this as an around town bike, or on longer rides if I had access to alternate transport in the event it cracked.
Having cracked a frame in a similar place 100 miles from home and having to do a field repair (which lasted 2 more years) I can assure you that the worst that will come of riding this is inconvenience.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance