Re: Ham planning Katy Trail across-MO bicycle trip
I'm assuming you've done the rails-to-trails riding before. KATY is crushed gravel, so prepare for the associated dust & drive train wear. There are some good breweries and wineries along the route (a hike up to Montel might be worth it, depending upon how heavy all your gear is -- they have a lovely large deck with a scenic view of the surrounding area. Wine, too!).
https://bikekatytrail.com is a pretty good website for info, as are others (plenty of info on the web for the KATY).
Enjoy your ride, let us know how it goes -- no 40m gear?