Originally Posted by CliftonGK1

I can do my 32mi r/t commute on my rigid 29er/CX race bike with 37mm knobbies and a Selle Italia Diva gel flow saddle that's on there because flying remounts hurt my butt on a Brooks. But I definitely felt sore all over after riding it on a 50 mile charity ride because that not what I built it for.
Meanwhile I can spend 250 miles on my B17 and not come away any worse for wear because I set my brevet bike up for all-day comfort, not for 45 minutes of pain cave mud sprints.