Though it should be pointed out that in terms of sprint speed Tim probably beats Dick in DCnU because Gymnastics have more running than Acrobatics.
I don't know about new52, but in pre-Flashpoint it was mentioned (in Teen Titans or Nightwing) that Dick is superior to Tim physically while Tim's forte was in intellectual matters.
Yes, that's why I said in DCnU, because Tim was given a background in gymnastics stupidly which alters his capabilities... just like the fact that Dick was like 17 when he started training under Batman alters his fighting abilities, lowering them significantly, especially when you also reduce Bruce's solo time, the time they trained together, and all of their ages.
I think it was nice addition.
It isn't because it screws up the character along with the not being able to figure out Bruce's identity and getting his parents in such danger. Part of the point of Tim's character is that he wasn't very athletic at all which forced him to rely heavily on his brain and tactics. Be adding that he was an Olympian Gymnast completely tosses that out the window.