I like speed to but my speeding down hills days are generally behind me. Fastest was 55mph going down Interstate 8 many moons ago. I wouldn't do that now unless it was a race. Now I don't go much faster than 40-45 but usually around 38. I'd be pretty p.o.'d if I mangled my bike, carbon wheel and my face on a training ride just to get down a hill a little faster. I'll make it up on the flats. Fun to watch the pros do 60mph in a technical descent though.