Mountain Biking - redline 29er, what size?

I'm 15 and trying to get into mountain biking with a 29er. I've decided on a Redline d440 and need to know if I should get a 19 or 21 inch. At the LBS I want to buy from, they don't have any in stock and require a deposit for a bike to be shipped out there, so id like to get this right the first time. I'm 6'1''(long legs too) with about a 33 inseam. I plan on doing some pretty flat trails but also want to introduce myself to mountainbiking too. Any insight would be appreciated.

I assume the inseam measurement you gave is the one of your pants, not actual.

If you are 6'1'' with long legs I would imagine your actual inseam to be 36''.

If that is actual inseam then you really don't have long legs at all.

My 2 cents, get the 19''

yeah, actual inseam is probably actually 35 inches. I don't know why but for some reason I am pushing for a 21 inch. Do you think that it would really just be a bad fit? Thanks for the help.

As you probably know, there is a lot more involved in fitting a bike than just inseam. Other measurements; torso, arm, blah blah blah. But you can "fit" a certain bike perfectly on paper, doesn't mean it's the right size for you. You need to find a way to get on one, feel it, ride it and say, "I feel a little cramped on this one" or "The reach is a bit too long" I'm 5'10 and ride a 19" that I think is a perfect fit. You may need to go to another shop if this one isn't willing to get you a bike in for you to try. Good luck.

Are you still growing?

I too have long legs, am just shy of 6 foot, and fit well on my 19 inch d660, however it has a different geometry (shorter top tube, for one thing) than the d440.

You could probably make either one work, but if you're a) not going to grow much more or b) don't have a really long torso and/or arms, I'd agree with C Lam ans say the 19 is likely better.

As one of the other poster's stated, you really need to see what fits you before you buy. Any bike shop that really cares about there customers will make sure they get the proper fit. Trust me, you don't want a bike that is too big or too small. Takes the fun out of it. You have to be comfortable.