Thanks for uploading the pix, ncsteve ; that makes a difference in my thoughts. The GT has fat tires just like the Trek, so a revised choice to give you good coverage in the range of talents.

Keep the Trek for the MTB with modern components, then the CrissCross, with its cool lugged steel frame. Treat the CrissCross to

• a new saddle,
• pedals,
• ergonomic grips,
• street tires
• clamp-on bar ends installed inside the grips could make it reasonably aero.

like this:

This bar end installation makes the bike noticeably faster downhill or into a headwind.