Both clear 700c x 50 mm, with the same official maximum. Reviewers of both bikes recommend running closer to the maximum than the stock spec — the Vault ships with 40 mm WTB Vulpines and the Checkpoint with 42 mm Bontrager Gironas, and in both cases moving up to 45–50 mm rubber transformed the ride.

If you want a true big-tire setup out of the box, neither stock build delivers it — plan for a tire swap on either bike.

They solve the same problem (high-frequency vibration at the saddle) very differently.

The Pivot Vault's Iso Flex hides an elastomer sleeve inside an elongated seat tube around a 27.2 mm post. Reviewers describe it as subtle — saddle height never changes, and it 'never feels like a suspension seatpost.'

The Trek Checkpoint's IsoSpeed decouples the seat tube from the top tube with a visible mechanical pivot, letting the post flex backward over hits. Reviewers call it more pronounced over washboard.

The Vault's system is quieter and more invisible; the Checkpoint's is more felt. Note that only the carbon Checkpoint SL has IsoSpeed — the aluminum ALR builds rely on tire pressure for compliance.

Depends on what you want from the bike. The Pivot Vault Pro Apex starts at $4,199; the Trek Checkpoint ALR 3 starts at $1,599 — a $2,600 gap. For that you get a carbon frame (vs aluminum), Iso Flex compliance, and Pivot's premium-tier finish quality.

The ALR retains the same geometry, the same 50 mm tire clearance, the same UDH drivetrain compatibility — and reviewers consistently praise it as one of the best sub-$2k gravel platforms available. If you don't specifically need a carbon frame, the ALR is one of the strongest value plays in the category.

The Pivot Vault — 420 mm across every frame size. The Trek Checkpoint runs 430 mm, also across every size.

That 10 mm difference shows up in low-speed handling: reviewers describe the Vault as nimble enough to creep over technical terrain even with its long wheelbase, while the Checkpoint feels more planted but slightly less maneuverable in tight turns. Pivot achieves the short stays despite the same 50 mm tire clearance, which is unusual — most adventure-gravel frames stretch out the rear to fit big rubber.

Yes on both, with caveats.

The Pivot Vault uses a 27.2 mm seatpost — dropper options at that diameter exist (Fox Transfer SL, PNW Rainier 27.2) but the selection is limited and travel tops out around 90–125 mm.

The Trek Checkpoint also accepts dropper posts, and Trek explicitly markets the Gen 3 frame as dropper-compatible. The Checkpoint accommodates a wider range of post diameters and travel options.

Neither is a mountain bike — but for technical gravel where a few inches of drop matters, both work.

The Trek Checkpoint wins this clearly on the SL builds. Reviewers describe Trek's downtube storage door as well-designed, secure, and rattle-free, with generous internal volume and a useful BITS bag system.

The Pivot Vault's ToolShed is described by reviewers as functional but a 'tight squeeze,' with one source noting the bottle cage mount screw lacks a seal and 'will likely leak in sustained rain.' It's adequate for a tubeless repair kit but not much beyond that.

Note that in-frame storage on the Checkpoint is SL-only — the ALR aluminum builds don't get it.

Yes. Both frames support 1x or 2x setups, mechanical or electronic groupsets. Pivot specifies that the Vault frame retains a removable front derailleur mount, and Trek's Checkpoint Gen 3 frame keeps the same flexibility.

In practice, every stock build of both bikes ships 1x — neither brand offers a 2x build off the rack, so a 2x conversion is an aftermarket project on either platform.

Trek offers a lifetime warranty on all OCLV carbon frames to the original owner — one of the strongest in the industry — plus a generous crash-replacement program through their dealer network.

Pivot offers a lifetime frame warranty against manufacturing defects to the original owner as well, with a separate crash-replacement program. Pivot's dealer network is much smaller than Trek's, which can matter for service turnaround in less-populated regions.