Race SL Hubs Spacing:148x12mm Boost and Specialized® SL 1

and Specialized® SL 1

MoPo: pure 42a single compound for maximum rear-wheel traction

making these wheels the fastest-rolling we have ever tested

e*spec-specific rims are also reinforced over the analog versions to support heavier full-power ebikes with a weight penalty of only 50-60g

and the durability of a 6069-AL construction

Race SL Hubs Spacing:148x12mm Boost and Specialized® SL 1Our all aluminum SL Race Hubs are lighter than our previous carbon shelled Race hubs, and even more durable. We kept the same freehub internals and 6 degree engagement for great feedback and performance, but wrapped it in a lightweight, all aluminum package that'll go for many years to come without hassle. Interested in matching hubs? Check out the front hub HERE.