Fuji Aloha 2.0
 

I saw one for sale for a good price 800. I know it's a tri bike but I have been thinking of getting into Duathlons and also this bike has 700 wheels instead of 650. It's a 52cm size which should fit me
as I am 5'7(almost 5'8). My current trek is a 54 cm which some say is a little large for me.
www.fujibikes.com/2006/bikes.asp?id=142

I think it will be fine also since I ride solo and flat terrain 99% of the time and it's darn windy here on most days. I guess I'm just looking for any input anyone has as to if this is a good idea to purchase. The bike is new 2006 model.

That frame looks a lot like my Felt tri-bike. Especially the way the seat stays connect to the seat tube.

I think $800 is a nice price. Fuji is a respectable brand and the components look good. Is this being sold from a local bike shop? If so, that would make it an even better deal (as opposed to an online shop) because you'd get to test ride it, and the shop would probably offer a free tune-up after a break-in period.

I'd say that as long as it fits you right, buy it. It's a nice bike and the aerobars will help you cut through the wind.

I have a 2004 Aloha and I am quite happy with it. Mine is custom built so its a bit different from the specs that are listed but for intent and purpose I think you'll be quite happy with for duathlon - which is what I do btw.

$800 is a great price for this bike. I noticed an immediate difference last year when I did my first du on this versus my old road bike.

You'd be surprised - I use this bike for all my riding and its great. It climbs well for a tri bike.

I'd suggest that you get a basic fit before you guess what size you need. Go to your LBS or a tri shop and have them do a standover test so you can get an idea of your size, and then when you get the bike, get a proper fit. The big difference between a tri-fitting and a road-bike fitting is the aero positioning. Thats where the fitting pays off.

Not from a shop
 

It's from a local seller but not a bike shop. I should be able to test ride but not fit it. I was checked for fit on my trek 1200 and said a 54 was the right size. I have since heard this is a bit large but I have had no problems.

I would just be careful because I ride a 5cm tri bike and a 54 road bike. The geometry differences between the two are more pronounced then you think. Its a just a heads up.

That is a VERY pronounced difference!

To the OP: I'm in the same boat as you. I'm 5'7" and I ride a 54cm GT road bike converted to fixed-gear for everyday riding, but have been fitted for 52cm'ish for a time-trial bike (similar to tri).

The only way to know is to try it out! Maybe bring along a friend with a digital camera so he can take photos from the side and you can determine if your body position is what you want it to be.

Oops I meant 56cm!!!

Is that the bike listed in craigslist/houston? Check out the Fuji Team race bike listed there:
http://houston.craigslist.org/bik/290514748.html
Come with a lot of goodies for $75 more but the frame size isn't listed.