Once you add the weight of all the gear you need to carry, a standard width tire will just cut into the snow. Riding a groomed trail doesn't mean that it's packed enough for a normal bike. Tuscobia for example didn't have any sections that you ride with a regular mountain bike.
Those races are what these bikes were originally designed for, very few people who own them use them for their intended purpose. I think that's why it's so easy to make fun of them. It's like that guy that buys a Hummer to drive around in the City.
Good answer .. makes lot of sense. Here are my observations on what I have noticed so far riding with fat bike people:
- I seem to have a harder time keeping my front wheel in the groomed groove when it's about 1-2 feet wide.
- I seem to get bumped off easier to the side if there a lot of bumpy foot traffic. Fat bikes are not totally immune to this, but seem to be better.
- More traction in some uphills.
- They can probably go faster than I can in ridable snow, given equal rider strength.
- There are some parts I sink and they don't.
But for the most part, I can still ride a lot of most the stuff they can. I guess the scenario would be different in deep groomed stuff like xc ski groomed trails where fat bikes are floating and skinny tire is sinking.
What irks me is when I see stuff like "conditions are good for fat bikes" when I've been riding more in the snow this winter than 99% of fat bikers in NJ.