LIMEY: Definitely get thee down to the LBS and get yourself fitted for the aerobars.
I got fitted for my road position and then went back to get my aerobars done - what I thought was a simple fit turned out to be a couple of hours adjusting, tweaking and moving! We changed the length, width, pad angle, aerobar angle and probably a couple of other things that I can't remember. Then we tweaked the seatpost and saddle fore-aft and nose angle to get a decent position - I actually found a better road position out of it too!
Don't get fitted too aggressively at first, get a more comfortable fit and then adjust as necessary. I've lowered the aerobars a touch (took out a spacer) since my last fitting but that's about it. If you're fit right, your TT position should be relatively stable - the handling will be a little twitchy at first but you get used to it. The only problem is changing gears.
If you do end up getting a TT bike, then make sure you get a really good fit.
In God we trust, all others bring data. - W. Edwards Demings
If God invented marathons to keep people from doing anything more stupid, the triathlon must have taken Him completely by surprise. -P.Z. Pearce
I will roll down to the LBS, however by saying temporary I am, hoping if I do really well in my first one (however I will quantify 'really well' I don't know) I will start saving for a tri-bike thus making my street bike with tri bars a temporary situation. :)
I think I will say if I come in halfway up my age group..I will start saving. :D
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