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You've done big races before though so other than missing a bit of butt hardening there's not likely to be a big disadvantage when training this way? It'd be cool to just to tabata or something silly only and see how an ultra race goes
Sure, someone who is not used to long rides needs to do long rides. Not doing them might not work for me: I've only done one 200km this year and I suffered, both back and motivation.
Also I'm missing out on trying out stuff like new lights and different luggage setups. Those things will need to be tried so I will throw in a night ride or two later on.
But I reckon there is value in training what you've not previously trained for. I've hardly ever done any speed/threshold stuff so reckon I should get a reasonable improvement from modest investment there, compared to the benefit I would get from doing more 3/400km rides.
If I focused on crits and 10-mile TTs I'd be inclined to throw in more long rides.
If I was Steve Abraham maybe tabata would be the thing.
Definitely there are different approaches that can work. This year is an experiment for me. I've done high mileages in the past and very little speed work. But, with a new baby, I can't just book myself out for the weekend and go off and ride, so I'm doing much less time and higher intensity.
There is a tendency for the Facebook/Strava set to get competitive in terms of number of miles ridden without a load of thought behind it. And a lot of people who do crazy mileages burn themselves out and disappear after a few years.