The Specialized Crux, by a clear margin. The S-Works frame is a claimed 725 g and the FACT 10r Pro/Expert frames are 825 g — both significantly lighter than the Vault's sub-1-kg frame plus its heavier component spec. Real-world built weights bear this out: a 56 cm S-Works Crux hits roughly 7.15–7.3 kg with pedals off, where the Vault Team Force XPLR AXS is closer to 8.3 kg.

On a flat, fast-paced group ride or a smooth gravel race, that weight gap plus the Crux's narrower, faster-rolling stock Pathfinder tires translates into a noticeably easier time holding the wheel.

The Pivot Vault, decisively. The Iso Flex elastomer seatpost damper is the headline feature — Bike Rumor's Zach Overholt described it as taking "the edge off bumps and vibrations" without ever feeling like a suspension post. Combined with 50 mm tire clearance and a longer-wheelbase progressive geometry, the Vault is built for hours in the saddle.

The Crux, by contrast, leans on a Roval 27.2 mm seatpost for compliance and asks the rider's tires and arms to do the rest. BikeRadar called the front end "slightly harsh on bigger hits," and Cycling Weekly noted hand fatigue on extended rough terrain.

Pivot Vault: 700c x 50 mm officially. Pivot's suspension-corrected fork (415 mm axle-to-crown) was designed around running wide, and reviewers consistently recommend going to 45 or 50 mm tires immediately — the difference in ride quality is described as "dramatic."

Specialized Crux: 700c x 47 mm or 650b x 2.1". Specialized's design priority was weight and aero shaping, not maximum tire volume. The stock 38–40 mm Pathfinder Pro tires are fast on smooth surfaces and limiting on anything looser.

On the Vault, yes — it's designed for it. Up to four bottle mounts even on a size SM, top tube bag mounts, fender mounts, and the ToolShed in-frame storage compartment with included canvas bags. Reviewers do note the ToolShed is a "tight squeeze" and the bottle bolt isn't sealed against rain, but the bike is unambiguously bikepack-ready.

On the Crux, with effort. Specialized stripped most mounts to save weight — there's a third bottle cage mount under the down tube and not much else. You can run strap-on frame bags and seat packs, but it's a workaround, not a feature.

The Vault offers the most flexibility: Shimano GRX 1x12 mechanical at $4,499, SRAM Force XPLR AXS 13-speed electronic at $5,599, or SRAM Force/X0 Eagle AXS Transmission mullet for the widest range at $5,999. There's also an entry-level SRAM Apex 1x at $4,199. The frame supports 1x or 2x, mechanical or electronic.

The Crux is mostly 1x SRAM XPLR — Rival, Force, or Red — across its carbon builds, plus Shimano GRX options on the Comp and Expert tiers. Note that the Crux cannot run a 2x mechanical front derailleur because of the cable routing; electronic 2x works, mechanical does not.

They're solving similar problems differently. Iso Flex is a passive elastomer sleeve around the seatpost that subtly damps bumps and vibrations through the saddle — Pivot's founder Chris Cocalis chose a single elastomer durometer after testing across rider weights. It's invisible in use and serviceable with Allen keys.

Specialized's Future Shock is a 20 mm steerer-tube spring that isolates the bars from the road — but it's a Diverge feature, not on the Crux. The Crux is fully rigid by design; Specialized treats it as the racy counterpart to the comfort-tuned Diverge.

Both score well on serviceability — neither uses a press-fit BB or a fully integrated cockpit. The Vault runs a BB386EVO press-fit (Pivot has a long track record of executing press-fit cleanly), a 27.2 mm round seatpost, and your choice of fully internal or partially external cable routing. UDH dropout for easy hanger replacement.

The Crux uses a threaded English BSA bottom bracket (universally praised by reviewers), a 27.2 mm round seatpost with external clamp, and a conventional two-piece cockpit on a tapered steerer. UDH dropout as well. Specialized went out of its way to avoid proprietary parts here.

Both are designed to be upgraded, with one important asterisk on the Vault. Reviewers across Velo, Bike Rumor, Gravelcyclist, and Grava Adventure Co. unanimously flag the Vault's stock DT Swiss ER 1600 alloy wheels and WTB Vulpine 40 mm tires as the weak link — JOM at Gravelcyclist explicitly says the bike "is screaming out for a wheel upgrade."

The Crux's lower-end builds (Comp, Expert) get similar criticism: reviewers feel the SRAM Rival 1x mechanical and DT Swiss G540 alloy wheels "don't match the price tag" of the carbon frame. Both bikes reward upgrading wheels and tires before anything else.