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I haven't, but as you learn more about bikes, you will probably find that their bikes aren't the best deals going like it seems at first.  I bought my bike last year when stores are having fire sales to get rid of last years stock and paid less than I would have for a bike of lesser quality from BD.  Some of their stuff is OK I suppose, but I wouldn't become polarized by them as some shining light on a hill... lots of fish in the sea.  What specifically are you looking at?  

well i am looking for my first bike, i have the one i use to train, is just a confort bike wich i purchase so i can workout sometimes, but as i start riding one day just out of the blue i decide to go for a long ride and i end up riding 25 miles and thats when i start talking things seriously. i have always been a good swimmer{lifeguard back in the days} i iknow i may better of waiting and using mine for now but i am working out like a maniac and the longer i ride the more faults i find on my bike. i anso want to do my first trialo in october{florida} and i would like to train in a diffrent bike. the biggest isue with me is that i am 6'2 and weight 285lbs do i was 324 lbs just back in february. 


ismael

"pain is just weakness leaving the body"

by the way i don't wanna breack the bank, i just can not afford that, ihave seen very nice bikes on craig list but none of them my size.

As delicately as I can, you might not want a tri bike until you get closer to 200lbs... just my opinion.  Even then you might not really want or need one.  I'm thinking the position might be tough for you, especially coming from a comfort bike.  Otherwise maybe a visit to a bike shop is what you should do and ask a ton of questions.  I presently have a road bike with a pretty aggressive riding position that is a better bike than I am a rider for the most part.  I may get a tri bike one of these days, but for now my road bike (Fuji Roubaix Pro) that I bought brand new for $799 is doing just fine.    

Great job on the weight loss, keep up the hard work and good luck!