I fully endorse the Mariner for trail riding. I'm 67 years old, have ridden mine 450 miles -- about half on trails-- and just love the bike. With its wide tires it's stable enough to roll over rocks and roots, thick sand or gravel, has plenty of power, and can fold into the back seat of a sedan (I bungee mine to the headrest). It's taken me on countless adventures. I say that because I never really intended to use it much as a mountain bike. I just wanted something versatile enough to ride on the occasional groomed park trail and leave more rugged trails for hiking. Kind of what you are saying, right? However, this thing is so capable that I'd actually rather ride on a trail than pavement, because it's more fun, rather ride than hike, and have ended up exploring so much more than I used to on foot. It's nothing to decide to ride up a side trail I'd never hiked up before, because I can do it quickly and effortlessly. If the trail goes up a steep hill, so what? I very rarely go over level 7 out of 9 for even the steepest terrain (although 9 is nice to have for the really mean grades). Usually, I'm on level 2-4 on a trail. And if the trail is rough, the fat tires generally roll right right on through. If not, the Mariner has a low crossbar, so it's easy to slide forward off the seat and have both feet flat on the ground, knees bent.
The thing that prevented me from ever being a mountain biker on a normal bike is the hills, and at my age that's even more of a consideration. You find yourself faced with endless circumstances on trails, and one I used to hate was one where you had to stop and cross over some kind of rut, or to slow to a crawl going around a sharp corner or around some obstacle, and then be faced with a steep uphill section that is next to impossible to start up from a standstill. No problem on this bike. Just set the pedal assist level, push the thumb throttle to get going while you start to pedal, and up you go.
The rack in back is really sturdy. I bungee a day pack to mine to get it off my back. You can buy a hard locking case for the back rack as well (3rd party, not from Volt Bike), but I don't like it for trails.
The seat and handlebar heights are adjustable & I've found the ride comfortable and much easier on the back than my normal bikes.
I've never ridden a Rad Mini, but they are probably similar in a lot of ways.
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