I don’t know of many that go smaller from there either. Hopefully some training will allow him to be able to climb on his own for some of the ride. Sticking to flat nordic type trails for fat biking in the snow might be our best bet. Really, this frame is most likely a back up bike for a family of enthusiasts that want their child to join the fat biking they do in the winter. While the Mongoose Argus Trail is trail worthy, there are other bikes that do trail riding better. There is a low level shimano hydraulic disc brake kit that is SO NICE compared to the cable disc brakes.
Roll over all sorts of difficult terrain with ease on the Argus Sport fat tire bike by Mongoose. And the Argus’ Tectonic T2 aluminum frame makes it lighter and stiffer than ever. Fat bikes are easier to find and more affordable than ever before. The fat bike market has exploded in recent years.
Mongoose offers an array of models that are specifically designed to suit different riders and terrains. Here are some top models in the Mongoose fat tire bike series that you might consider. With that said, the bike handled as a mongoose racing bike fat bike should.
Gradual climbing up our neighborhood trails was OK for a while. Eventually he would tire out and need the tow rope. As you can imagine, my 70-pound child really struggles pushing 50% of his body weight uphill with the Argus. The Trax tow rope was an absolute must with this bike.
The drive train is setup for either snow or sand riding and my son seemed to ride comfortably. Mongoose made a sound decision considering the weight that a child must pedal. Having a wider gear range makes for a versatile bike that can conquer the terrain. Shifting worked out of the box and functioned well.