Mike.....yes, I would have to get a 120mm stem, minimum. The saddle rails are also somewhat short, which limits the positioning. My Selle Smp saddles would work nicely. No doubt a set of GP5000s would increase the speed. But this bike just doesn't want to "go". Even with Vittoria Graphenes that I used in an actual event on a different bike, will allow me to take off when I really hit the cranks. Not this bike. I'd have to place around with shorter cranks, new wheels and tires just to see if that will work. But alas, I'm not willing to invest the time and money into it.