Kinda strange that TR doesn’t list Mountain Biking as a valid Off-Road Discipline for an Event… I get it is called Trainer ROAD - but they have a bunch of “off-road” disciplines except maybe the most common off-road category. Guess I’ll enter Gravel. I know it doesn’t really matter in terms of the plans it produces, but would be nice to be able to select the actual genre of my event…
Eh? Cross Country, enduro, marathon, down hill, short track. All sub genres of mountain biking.
blink
There’s only 2 in that category that AREN’T mountain biking. 
By the way, it absolutely matters with the plans produced. A gravel plan will be quite different to a gravity plan.
AH Got it! Thanks. Makes sense. LOL. I’ll adjust my event to Cross Country
Was this actually a legit question or someone trolling?
The names of the various various MTB subdisciplines are confusing enough that this is a fair question, however it was meant.
@dhaines83 @Wheatstraw53 - unfortunately it was legit. Silly in hindsight. I live and train in Florida and ride road, gravel and “mtb”. Focused on ultra endurance events. There are actually great single-track parks in Florida… But I don’t ride in places where there is DH, I don’t know what Enduro really means (endurance?), the term XC Marathon is new to me… So it was confusing. I’ve done Leadville 100 - but honestly, that is more like a gravel event. So I guess my 100 mile XC single-track type events without a lot of technical stuff (like the Skyway EPIC 100 miler in Alabama) should be called Cross-Country Marathon? Indicating long distance? Thanks!
The closest fit is probably (Cross Country Marathon) for the type of events you’ve listed. It’s what I use for my MTB 100s and XCO race season.
Just Google those terms. You’ll learn a lot about the different types of mtb racing. You’re right though, XC Marathon is your best bet.
I had to figure out what those terms mean too when I began with TR. All at once, a year ago, I went from a “casual trail rider” who didn’t know what watts were to training, racing, watching XC worlds, etc.
Ah but what about:
Freeride
All Mountain
Trail
Down Country
How could they leave those out?! 
Awesome!! Makes sense and helps a lot.
I really hope “gravity” is some sort of genre for extra terrestrial riding. That really would complete the TR portfolio. I have images of George Clooney and Sandra Bullock sat on turbo trainers in a spacesuit.
LOL That is hilarious @Rob
Enduro has to be the least descriptive name relative to what it is for any sport ever. Maybe tiddlywinks. Nah, enduro is worse.
“Downhill Racing without Lift Support” just rolls off the tongue, doesn’t it? 
Yeah, I know some are set that way (with lifts) at least in part because of the location (ski / bike resorts in many cases). Surely varies with location and specific events.
Either way, my comment was a joke that failed like many of my other attempts
Roadies without the road? wow…that hurts.