Olympics 2012 track cycling

The points in question are 15 meters either side of that which which would have been indicated with pads on the cote d'azur, giving a 30m changeover zone. If the following rider starts to pass the front rider before the first point then it's a DQ, if you haven't started passing completed your change by the second point then it's a DQ. Even just slightly overlapping wheels before the 15m point would lead to a disqualification.

Fixed that