text: how many kilometers is the olympic cycling size oval ?   i think you mean the banked track - a "velodrome"  the length varies. most are either 250 meters (.25 kilometer) or 333 meters.  some are as short as 125 meters, some as long as 500 meters.  if you're talking about the road course, it varies with each olympics. in athens i think it was about 15k per lap, for a total of over 200k in the race (from memory).