Eclat kolibri cassette hubeclats kolibri cassette hub is wonderfully simple elegant and light the kolibris flanges feature a low profile design to mirror the front hub design which gives the bike perfectly balanced aesthetics a 14mm hollow axle ensures the weight is kept down helping to tip the scales at an impressively light yet strong 439 grams robust and durable thanks to the use of 6061 t 6 alloy this kolibri cassette hub is a smooth operator features material 6061 t6 alloy hub s