Thanks to everyone for your input. I measured the distance between the rear dropouts. It measured 5 1/8” or 130mm. My Upgrade options are wide open.
I have another bike that I built and use as my road bike now. I started with a Soma Smoothie ES frame. All the components are 9 speed Shimano 105, Ultegra and Dura Ace. It’s been 12 years since I built it.
I wasn’t sure what the potential my old Cannondale had. That CAD2 aluminum frame is VERY stiff, the geometry is quick. It makes for fun short rides as I recall. Now I can plan an upgrade. I will likely hold off purchasing the components until parts become more available.
You guys make this forum an important resource.
Thanks again....Jim