I currently have a specialized tarmac expert, that i have used for a sprint and half IM, and will be doing another half later this year on this same bike. I have added aero bars and moved my saddle up and forward to get into a good position, which i noticed the differnce when I did my run, my legs where great right off the bike. My question is with doing an IM next may, which i think might be my only one at this distance is there a real value add in get a tri/tt bike? I am not fast in my last Half my bike split was right at three hours. any advise would be nice.