Yes the 56cm feels good. But the 58 cm bike i have is feels good too. I used to ride for two years almost daily steel 63cm road bike. In hilly trail from 700 feet to 900 feet elevation 10 miles long i do that ride in around 50 minutes. When i had the lighther bike the 58cm i think i do that 10 miles faster but other i felt in hills i ride some faster in overall time i not see any improvement in my time really. What is means really when say the bike fit the person and what happens when the bike is too tall for the person