Soloist Ultegra Di2 Size:54 works with 10-50t and 10-52t

works with 10-50t and 10-52t cassettes

The difference is a 4mm longer axle bringing the pedal's center from 52mm to 56mm allowing riders with wider hips the ability to achieve proper knee and foot alignment

Presta/Schrader compatibility

Thin & Convex: The ultra-thin

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Soloist Ultegra Di2 Size:54 works with 10-50t and 10-52tThe Soloist. Its a name from deep in our history, but immediately familiar to anyone with bike racing memories extending back to the early 2000s. It was the weapon of choice for top World Tour contenders on CSC and the Cervelo Test Team, and were bringing it back for a new generation. The new Soloist is designed for the week in, week out rider and racer who can only justify one high performance bike. It balances light weight and aerodynamic advantages