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Snap poll: What’s the lightest bike frame in the Specialized line-up? Has to be one of their road or cyclocross rigs, right? Not anymore. Meet the new Specialized S-Works Epic hardtail, with a claimed frame weight of 845 grams size medium including paint and necessary hardware.

Specialized S-Works Epic 29er Hardtail

The sub-900-gram frame uses Specialized’s top-end FACT 12M carbon. Also note partial external cable routing, which helps keep weight down — and is a lot easier to work on.

But this was not just a grams-shaving project, says Specialized. To hit the ideal balance between stiffness, weight, and strength, they used their top end FACT 12m carbon that’s usually reserved for the road side of the line, and used only straight tubes, which are lighter and stronger, but did necessitate the use of a fork bumper on the underside of the downtube.

Specialized S-Works Epic 29er Hardtail

Tubing and lay-up is all size specific, meaning just enough material used.

Sizes run S, M, L, XL, and all tubing and lay-up is frame size specific, which basically means they use just enough material to get the job done for that particular frame size. It all adds up to a ridiculously light finished product. The pictured build with SRAM XX1 Eagle drivetrain, RockShox SID World Cup 29 fork, and Roval carbon wheels comes in at around 18 pounds.

Specialized S-Works Epic 29er Hardtail

Tires are Specialized Fast Trak with Gripton compound. The rear is 29×2.1, while the front gets some extra rubber at 29×2.3.