Rust inside a steel frame

[Sardine]

It's just above the bottom bracket shell as far as I can see. Thanks Indysteel.

[indysteel]

Here's my husband's suggestion: use a long wire brush (like perhaps one you could use to clean a shotgun) or a drill with a wire brush attachment to it to wear the rust down to bare metal. Then treat the bike with a rust inhibitor. He didn't disagree with the Evapo-rust solution, but you would have to plug every hole in the bike in order to treat it. I did read a thread on MTBR.com where someone did that with good results.

Beyond that, you might see if anyonein your area does bike restoration.

Rust in the seat tube isn't as alarming as it would be in the BB shell, but I'd still be a bit worried about if it were me in that spot of the seat tube.

[Sardine]

I'll give the long wire brush a try (though I'm going to have to improvise) and see how well I can clean it up. Hopefully it will also give me a better idea of whether the bb shell is affected. If I'm not entirely happy, I'll take it back to the shop that built the bike for me since it's one of their own frames, even though it's been a few years now. The location of the rust spot does worry me.

Thanks for taking the time to help me out.