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chrismcr
russmeyer
Even if it's rust doesn't have to mean anything. I've ridden horribly rusty bikes with no trouble and I'm 80 kgs. Clean it out and then rap carefully with a screwdriver/spanner handle or something to see if there's any dull sounds, give the external rust spots a good pry with knife/screwdriver. Sand down and inspect. Unless you poke through anywhere things should be ok. When dry, spray or pour linseed oil inside the tubes and hang up to dry for a couple of weeks, rotating every day or so to distribute evenly. Works on the outside too if you don't want to respray. YMMV but this has stopped rust in its tracks for me, rode a frame with bare metal around the bb/chainstays (treated with linseed oil) through three Swedish winters and no further rust.