Spin Forest! Spin!
Join Date: Sep 2007
Location: Arrid Zone-a
Bikes: I used to have many. And I Will again.
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This is a nice score. An USA-made Trek 930 with lugs. The rust is surface only.
The choice of remedy depends on how much this bike is worth to you.
If you want to restore it then oxalic acid bath is the best results.
If you only want to arrest the rusting and ride the bike, a beater or commuter, then wire brush/naval jelly the rust spots till the rust is gone, and spot prime and paint the areas. Another option is to buy rust neutralizer at the auto parts store. Carefully brush it onto rust spots and it'll convert the rust to inert state, then paint over it.
A Trek 930 is a worthy frame to save. Tru-Temper Cr-Mb DB tubing throughout.