|The Twin Six Standard Rando now comes in 650B or 700c|
Okay, here we go folks. Just to reiterate, this is only my opinion.
The industry is making so-called "gravel bikes" which are dual-wheel size compatible. These are the "latest" thing now. The entire genre probably got its start with Open's "UP" model. Once that bike made a big splash it didn't seem to take long for others to follow suit. This is the gravel bike "du-jour" of 2017-18. Most will be made of carbon fiber, but I've seen aluminum and steel models too. Big, chunky carbon forks with through axles will be on the front, disc brakes all around, and typically these sport shorter chain stays to appeal to the roadies out there who think longer than 425mm chain stay lengths are "unresponsive".
There are a lot of announcements, but not much in the way of details, and even less in terms of ride reports. The one thing all of them tout is the ability to run a 2.1' X 650B mtb tire. This seems to be just "accepted" as being a "good thing" by all who have reported on these bikes. However; I don't think it is so much a feature as it is a marketing tool to get you hooked up to buy one.
|Yes, I have tried it, as a matter of fact.|
While one could do whatever the heck they want, and run a heavier, knobbier tire and call it a gravel bike, I don't think this is what the marketers mean. I think what they mean is that your gravel bike can be a mountain bike. So, leaving the gravel stuff aside, let's take a look at what makes this a not such a great idea.
Okay, here's my take. When you eat steak at a restaurant, you could use a table knife to cut yourself a bite to chew. It is a knife after all, and why shouldn't you be able to use a knife for butter when eating steak? Well, I don't know about you, but when I eat steak, I like to use a steak knife. Just like when I mountain bike, I roll out a mountain bike, not some small wheeled, kinda knobby tired, drop bar bike. Why? Because one tool is better for the job than the other is, that is why.
Again, you can do whatever you want to do, but my point is that marketing these 650B/700c "gravel bikes" as do-it-all bikes that could be a mountain bike isn't reality. For someone, or two, or maybe three of you, yes. It will be that bike. For most folks that buy in to the idea, they won't be satisfied. They won't be satisfied because, if they have ridden a mountain bike, they will quickly realize that road-ish geometry and road bike positioning, which most of these bikes have, isn't an ideal solution for mountain biking.
So, I am totally not buying this malarkey about using these super-designed, gravelly bikes for mountain biking when they are the furthest thing from what reality in mountain biking is these days. Not for most people, it isn't reality. Again, there are exceptions to every rule, I get that. But that said, these 650B gravel bikes are not mountain bikes too.