Pre-beta — tell us what breaks.
FLEXMARKSTHESPOT
REP Fitness · Pull-Up & Grip

Shackle

Specs validated · FMTS schema
Shackle

A shackle anchor for 5000 Series racks — a mount point for straps, rings, and rope work.

Full specifications

Essentials

Attachment type
Adapter

Compatibility

Fits which rack
75x75mm / 25mm
25mm

More specs

Mounts to
Rack
Safety-critical
No

Fits these racks

Every rack in the catalog, checked against this attachment's mounting specs and ecosystem listings, grouped by what the evidence says. Each tile carries its verdict — open “why?” for the evidence, confidence, and full reasoning.

Checking a specific rack?

Don't see your rack, or don't own a catalog model? Describe your rack's uprights and hardware and we'll highlight the verdict for it.

Racks from this attachment's own maker with fit evidence — the racks it was built around; “why?” shows the full reasoning.

All In One Trainer
Half Rack
Power Rack
REP FitnessOmni™ Rack
fits$1069.96
listed for the same mounting ecosystem
Rig
Wall Mount Rack
Yoke
REP FitnessOxylus™ Yoke
fits$984.99
listed for the same mounting ecosystem

FMTS aggregates fit evidence from specifications, owners, manufacturers, and occasional first-party testing. A fit report documents that parts mate; it is not a certification that a product is safe to load.

Recommend, mixed, or don't-recommend from people who own the Shackle. No stars and no average — a rating out of five hides more than it says. Verdicts inform you; they never move this product's ranking anywhere on the site.

Own this one? Write a verdict

Verdicts are account-gated — no anonymous reviews. It keeps the section accountable and stops the spam that eats open review boxes.

Questions & answers

The things a spec sheet doesn't answer. Questions go to people who own the Shackle; answers carry a label saying where they came from — owner, former owner, or checked by us. A label tells you who's talking. It never decides who's right.

Ask about the Shackle

Concrete questions get answered: will it fit, what's included, how does it behave under load. Every question is read before it posts, and no links are allowed.

Price history

Tracking since Jul 2026 — first captured at $39.99. Not enough history to draw a trend yet.

Used prices

What owners report actually paying — or getting — for a used Shackle. Reported by members, checked by hand, shown as ranges once enough reports land. It never changes how anything ranks on FMTS.

Bought used

No reports yet.

Sold used

No reports yet.

Bought or sold one used? Report the price

Reports are account-gated — no anonymous numbers. It keeps the data accountable and the spam out.

In templates

Coming soon

Published template builds that include this product will list here, so you can start from a complete gym rather than a blank slate.