I'm a complete noob to mountain biking. Looking to get a bike for our son who rides mostly on dirt and semi-sandy roads. No steep hills. Our budget is $200-$250. I figured that since only Walmart bikes are available new in this price range, used is the way to go. Aside from the fact that I don't know much about mountain bikes, finding a used bike has been made more difficult by the fact that 95% of sellers don't bother to list the frame size of the bike. Isn't that a bit like selling a pair of shoes without stating the size?
We're considering an older steel mountain bike which is listed with the following components. (The price of the bike is about $200.) Assuming that the bike is in reasonably good condition, are these decent components for the price or just too outdated? 3x9 XT derailleur, truvativ fireX crankset, sunRinglé flat pedals, wtb speedDisc wheel set, avid mechanical disc brakes, kalloy guizzo stem (100mm), race face evolvXC low rise bar (640mm), odi rogue lockons, race face evolvXC seatpost w wtb laserV saddle. It says that the brand name of the bike is Zion. I've never heard of that brand. A google search brings up biking trails in Zion National Park but no mountain bikes of that brand.
A fatbike might be better for our roads but those seem to be out of our price range. I wonder how feasible it would be to add fatter tires to the bike we're looking at. Since the seller only included one photo, I can't tell the width of the forks.