carleton All true I guess. Bike fitter had very little experience with track cycling. My son was training with world champion in scratch on the same track, who told him to get track bike fit, cause he has pretty lousy position. So we aimed for best fitter in town. In general, it is very difficult to find fitter with track experience. I've spoken to my friend, whose son is a sprinter for national team about fit and cranksets. Regarding fit, his son rides Look size 58. He is same height as my son but much shorter legs and longer torso. As far as crankset is concerned, we currently have DuraAce Track in chinese bike. He recommends to keep it that way. What's your opinion? If we can choose, what lenght of the crank arm should we choose? My son was riding 52x14 in recent endurance trainings. I've spoken to our junior who was silver medalist in Omnium in European Champiosnships. He rode 55x15 in endurance events and 56x15 in 3km pursuit.