height chart.
 

I looked and could not find this, so if it this has been posted before I am sorry.

Is there a place I can go to find out what size bike I need. I am 5'9ish.

Ok, here.

I found site with different suggestions for the sizes,I was asking here to see if there was a definitive on.

It would help to know what type of bike you're looking for. Dirt? Road? All have different sizing standards.
If you go onto the website of the bike you're interested in, they may have a specific chart.
Better yet, go to a bike shop, and have a skilled fitter advise you.

Everything I've ever read says it's inseam that dictates frame size not overall height. For roadbikes, one method is to take a barefoot crotch to floor measurement in centimeters and multiply it by .667. This will give you frame size center to center. When I do that I come up with a frame of 54-55 cm. And, that's perfect for me. FWIW I am also 5'9" with a 32.5" inseam.

I've used this one with success:

http://www.ehow.com/how_14104_determ...ect-frame.html

No definitive answer which is why it is worth going to a good bike shop with an experienced fitter for a proper fit. Different people of the same height can have different body proportions and body flexibility. A bike sized for a person with long legs and short torso will not fit correctly someone of the same height with short legs and a long torso.

Your inseam measurement is much more important than your height.


http://www.cyclemetrics.com/Pages/Fi..._fit_links.htm

Yep. I prefer this link: http://www.rivbike.com/article/bike_...g_a_frame_size

I don't support everything they say or do, but I think they nail the sizing question for road bikes.