Magoodigan

Hey, i came across this mountain bike, no suspension, disc brakes, 3 speed internal hub, but what is a bike like this used for? I dont know much about bikes, could you use this mountain biking? Or is it just for commuting?
https://sacramento.craigslist.org/bik/2599274252.html

CB HI

Not set up for mountain biking, only 3 speeds.

OK set up for commuting if gearing works for hills in your area.

OK for utility if it has eyelets and you add a rack.

fietsbob

Transportation.

stapfam

Looks like a Franken bike.Collection of bits that were lieing around and built into a bike. Probably would be good as a commuter/street bike if Slicks were fitted or if it were to be used on flat unpaved trails. But the frame is nothing special- fork could be though as it looks Like a Project ll that is probably one of the best rigid forks around. 29er wheels but a Sturmey archer hub? Good solid Gear system that is reliable but not good for offroad and not really good for a hilly area. Disc brake on the front and "V" on the back is interesting- especially if the braking is not balanced front to rear but should be OK. Size of the crank ring would have me worried if I wanted to get any speed out of it aswell. That looks like a very low geared bike.

Providing everything is in good condition and it suits the area you are riding in- it would be an ideal bike but Price seems too high for a collection of bits that won't suit everyone.

JonathanGennick 

@stepfam probably has it nailed. Some enthusiast likely pieced that bike together from spare parts. That said, there are many out there who enjoy riding fully-rigid bikes, especially in the 29er wheel size. The bike does have treaded tires that are singletrack-worthy. The three-speed hub is a rather odd choice, but the freedom to experiment with unusual configurations is part of the joy that comes from knowing how to build your own bikes. Hard to say what the person who built the bike had in mind, but it probably involved something fun that made sense to him at the time.

Edit: You could use the bike for "mountain-biking" depending upon where and how you ride. Flat trails? Smooth? Why not? I'd probably use the bike as something to explore old logging roads on myself, or maybe I'd throw some commuter tires, rack, and fenders on the thing and ride it around town. More likely, I'd pull it apart and use the parts for other builds.

cyclops

Nice smooth trails? Maybe the guy got sick of derailluers and couldnt afford a Rolhof. But who can?

Monster Pete

Definately looks like a frankenbike to me, but it might make an alright bike for general transportation if a larger chainring was fitted.

SlimRider

This bike reminds me of the Surly Pugsley, minus the gearing. I'm thinking that it could be used primarily for the flatlands and low-grade hills that have diverse terrains. It would be especially great for the beach or for lumbering across a frozen snow-capped lake from one ice-fishing camp to another. The absence of greater gearing selections seriously handicaps this bike as a genuine mountain bike.

Equipped with racks and panniers, it could be a heck of a utility bike. However I couldn't see any eyelets for good rack support.

It's still a nice bike, though!....I'd take it!

I'd have to modify it a bit though. I would take it a part and have the proper eyelets welded on. Next, I'd have it powdercoat painted, black.
I would then place a Rohloff hub on it. Install a nice strong, rear rack, with an accompanying set of fenders. I'd place a bell upon the newly installed North Road handlebars, just after placing a large set of panniers over the rack. It would make a heck of a utility bike at a large or expansive ice-fishing community.

I'd convert this bike into an Ice "City Bike"!

- Slim

sknhgy 

The tires suggest trail.