im looking for a mountain bike that can go fast or gain speed easily something lightweight rather then something else for trailing and i want it to be able to take a hit so something strong but light and in the range of 300-400 dollar range and id prefer disc brakes atleast front suspension and probably 120 mm shocks and i want it to be comfortable

I wouldn't go getting your hopes up for something that fits all of your requirements. Most 120mm forks alone start in the $300-$400 range. What you would be wanting would wind up being well over $1,000 you won't find something with that travel used for $300-$400 and if you do, there's a good chance of it being broken, or stolen or a scam of some sorts.

Hmmm....this sounds about right for you:

https://www.bikesdirect.com/products/...tcast29_08.htm

can i get shocks on it or anything? or would i be able to get gears added on?

k ive narrowed it down i think i want the first one but im not sure and ill use it in an urban environment also not just dirt cuz i cant drive so i cant get to a trail easily


if theres something thats better that u think would be beter for me tell me im only 5 foot or so cuz im only 13 so i got more to grow

https://www.bikesdirect.com/products/...ne_600HT07.htm (the one i want)

https://www.bikesdirect.com/products/...tcast29_08.htm

Fixed
I was bored. -_-
lol. anyway...

That bike is most likely going to be on the "heavy side."
However at the price range, it's hard to find something that will meet all your wishes.

As your only 13, spending top dollar on a smaller sized frame prob. isn't a good thing.

You may want to take a look at what some of the other brands has to offer,
Trek, Specialized, Gary Fisher, Cannondale, Kona, and a few other companies have some decent starter bikes.

So what about this Cannondale Men's F9 Hardtrail Mountain Bike, looks much lighter than above ones.