Name: Zagłębiowska Masa Krytyczna
Start: Railway Station Sosnowiec Główny,
Period: every year
Date and Time: 15:00 ( 3:00 p.m.) - 3'rd May
Distance: 13 - 18 km
Route: along the main roads of the cities of the Dąbrowski Basin
Description: One of the most popular in the South on Poland and the largest due to the number of cyclist. Every year there is about 4000 - 5000 people. Every edition have their own message and the aim.
Every event participant gets reflective vest with the logo of editon.