You can pick up your race number from Alpi store (Vorino street, no. 19) from 10 a.m. to 7:30 p.m. (Saturday from 10 a.m. to 6 p.m.). After 12 p.m. (noon) on June 17th race numbers can be picked up only at the Start.
Race numbers must be visible during the race and attached at the front of the bike. Runners can pin the race number on their shirts or shorts. Please take care not to fold the race number across the chip.
Detailed information about the climb/descent and distance between aid stations can be found here (in Bulgarian).