I got a wild hair and built a gravel bike. I tried to use as much parts as I had on hand but still had to buy a frame set (Trek Domane ALR on sale for $650), Bontrager Paradigm Comp 25 wheels ($500), disk brakes, tires and shifters. And yes, I know my garage is a mess!
I need to adjust the cockpit a bit with different bars and stem but so far I like it.
