Hi GSteptoe
it all depends what distances tri's you want to do. I know you say you only want to do 'amateur' but anyone with some training can do an olimpic or even half iron, they'll just do it in a 'poor' time.
From what you describe, you have it all going for you, the swimming, even though you have given up at 15 , you might have lost some fitness and stamina but I doubt you lost the skills you gained over many years. Must be a bit like cycling once you learn you wont forget. So I have no doubt you will get back into that in no time. Cycling seems pretty good to me. Running 5k a day seems good as well for a Sprint - how long does it takes you to run it? If you want to do more you will need to Run longer distances.
With regards to the bike if you only want to do Sprints and Olimpics then it would be nice to have a Tri Specific bike, as well as a 'training' bike.
If you do any longer distances you would find that is not really comfortable to stay on the tri bike position for 50 miles or so. If you have only one bike I would recommend having a road bike and putting aero bars on it. I can go in more depth with this if you need but dont want to overload you with information. But if you have any more specific questions just fire away, Im sure you will get plenty of advice here.
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I'm thinking of starting with a sprint distance triathlon this summer building towards an olympic distance event by April 2013. According to my Run Keeper iphone app (which I strongly recommend to anyone thinking of doing any sort of running and it's free - can track your exact distance, time, etc. and even maps your route for you) I run 5.45K in 25 minutes.
At the moment I've got a fixie bike and a 16-speed geared bike but both I built using vintage frames so not really suitable for triathlon training I don't think, but having given it some thought since I posting I think it would be definitely worthwhile having a tri-specific bike. I was reading that the angles on the frame are designed so that the rider's exercise will have more emphasis on a slightly different muscle group than when they are running or something? as I say I'd like to build one on a budget of £800 but where to start? Can you recommend an affordable, good quality frame?