FSA Omega Mega Exo Compact Chainset 2013: New design drive arm with closed spindle hole & updated graphics. The FSA Omega Mega Exo Compact Chainset utilises the same external bearing technology as their top of the range chainsets & offers exceptional value. Ideal for hilly roads or cyclocross use with a 50/34 chainring combination & low 925g weight (incl BB). Shimano 10 Speed New design drive arm with closed spindle hole Integrated Mega Exo 19mm BB Die cast aluminium crank arms Chromoly chainring bolts Mega Exo oversize cartridge bearings Mega Exo steel cups White painted graphics Rings: 50/34 BCD: 110mm Chainline:44mm