I have two virtually identical road bikes. I'm sending one frame back to the builder to make it closer to the other frame (shorten up the chainstays). Other than the one frame having a 15 mm longer chainstays (soon to be fixed), the two bikes are virtually identical - group, bars, stem, post. I use the same 3 sets of wheels between the two bikes.

Other than those I have a "retro" track bike, semi-current mtb, current tandem, Sting Ray. I haven't ridden any of those in two years or more.