The purists' choice for street and track performance. The new Omnium track crankset is the first external bearing track crank in the world. Designed for world-class track racing, but also at home as the ultimate ÔÇ£fixieÔÇØ crankset, the Omnium features our strongest and stiffest alloy, 7050-T6. The full 5mm thick 7075-T6 chainwheel was developed for use only with 1/2 x 1/8 chains. Reports from our test riders suggest that this is the stiffest crank they've ever ridden. Arm Material: 7050 Alloy. Chainring Material: AL 7075-T6. Weight: 825 g. Arms length: 165 mm. 48 teeth. Includes GXP bottom bracket.