BEST MOUNTAIN BIKE REVIEWS

I notice Schwinn bikes are a bit cheaper than other brands like Raleigh, Trek, Giant... How does Schwinn compare to the more expensive brands?

If you have a Trek 7100 can you change it to a mountain bike by just purchasing different components.

I've got a trek 3900 right now, and its not really performing like i'd like a mountain bike to. I'm definitely investing in disc brakes and a solid fork on the next bike i buy

I have an option to buy a 10 year old but well cared for cromoly framed Marin mtb with upgraded wheels and brakes and front suspension, or a brand new lower end Trek also hardtail but aluminum frame. There is also a Devinci hardtail aluminum frame for about 100 dollars more. Which should I choose?

What mountain bikes are more reliable: Marin,Cannondale,Trek or specialized? I want it for everything from tackling a moddy mountain to goin to tescos...

Where do you buy bikes like Trek, Giant, GT, Kona etc wholesale, Ive looked on their websites and theres nothing about becoming a dealer or licensed seller of their products any ideas ?

I'm looking for a new road bike, and the main criteria is going to be size. I'm 6'8", so I think I'm going to need a 62cm frame as an absolute minimum. I've looked around and found some 62cm bikes from Kona, and a 64cm frame from Trek.

Any other suggestions?