The BOB Smith Machine Rack Attachment

Name: The BOB Smith Machine Rack Attachment
Brand: Fringe Sport
Rating: 5.0 (4 reviews)

The BOB is Fringe Sport’s rack-mounted Smith machine attachment, built to convert an existing 3x3 (or select 2x3) power rack into a guided-bar Smith machine without buying a standalone unit. Unlike traditional Smith machines that lock you into a proprietary bar, the BOB uses spring-loaded clamps to accept your own Olympic barbell — any bar with a 25-32mm shaft fits, and swapping between bars takes about a minute with no tools. A split-rod guide system with precision bearings and UHMW plastic at every contact point delivers smooth, controlled bar travel, and the carriage can reach a lower starting position than most rival rack-mounted Smiths, which matters for hip thrusts, low-bar squats, and deficit deadlifts. It mounts on a single upright (either side), rated to a 700 lb capacity, and adds roughly 17 lbs to the barbell when secured. It ships in a matte black powder coat and carries Fringe Sport’s lifetime warranty against manufacturer defects.

Finish	Powder-coated matte black
Height	87.4" (varies by rack)
Mounting	Single upright, either side
Warranty	Lifetime against manufacturer defects
Product weight	54 lbs
Weight capacity	700 lbs
Rack compatibility	3x3 racks and select 2x3 racks (1" or 5/8" hole spacing)
Added barbell weight	~17 lbs when secured
Barbell compatibility	Olympic bars, 25-32mm shaft diameter

What is a Rack Attachment?

What rack attachments are

Rack attachments bolt or pin onto a power rack or squat stand to expand what it can do — J-cups and safety arms/straps (the essentials), plus dip bars, a landmine, a lat pulldown, weight-plate storage, roller J-cups, and more. They turn a rack into a whole gym.

Compatibility comes first

An attachment must match your rack’s upright size (2x2, 2x3, or 3x3) and hole pattern/hardware (e.g. 5/8-in vs 1-in holes, Westside spacing). Attachments are usually series-specific — a Monster Lite J-cup won’t fit an Echo upright — so confirm the fit before buying.

How it compares

	The BOB Smith Machine Rack Attachment	Monolift Safety Straps	QuickMount Bracket for VOLTRA I	Monster J-Cup - 2" Sandwich
GymRadar rating	5.0/5	5.0/5	5.0/5	5.0/5
Price	$599.00		$150.00
Finish	Powder-coated matte black
Height	87.4" (varies by rack)
Mounting	Single upright, either side
Warranty	Lifetime against manufacturer defects
Product weight	54 lbs
Weight capacity	700 lbs
Rack compatibility	3x3 racks and select 2x3 racks (1" or 5/8" hole spacing)
Added barbell weight	~17 lbs when secured
Barbell compatibility	Olympic bars, 25-32mm shaft diameter

5.0/5 · 4 GymRadar reviews

Reviews by source

Expert	5.0/5	4 reviews
Retailer	5.0/5	11 reviews
Youtube	3.8/5	3 reviews

Fringe Sport’s BOB turns a 3x3 rack into a bring-your-own-barbell Smith machine at the lowest price in its class, and two independent hands-on reviewers came away impressed after real use despite an editorial write-up flagging it as rough around the edges. Its standout dimension is functionality: any Olympic bar with a 25-32mm shaft drops in and out in about a minute, the fastest swap of any comparable system, and the carriage travels lower than rival rack-mounted Smiths, which matters for hip thrusts and deficit deadlifts. The weakest dimension is build quality — reviewers consistently note noticeable side-to-side play (roughly a half-inch to an inch of bar tilt) and wing-nut/threaded-rod clamps that need periodic retightening, even though the guide rods themselves are thick-gauge steel with UHMW plastic at every barbell contact point and one tester’s 315 lb drop test held up fine.

+Functionality: bar swap takes about a minute with no tools — the fastest system among rack-mounted Smith attachments tested (Gluck's Gym)
+Functionality: carriage travels lower than Rep's Smith or Bulletproof's VTS, preserving range of motion on hip thrusts and deficit deadlifts (Gluck's Gym)
+Build quality: UHMW plastic at every barbell contact point means no metal-on-metal contact, and thick-gauge guide rods show no sign of bending under load (Kinzi)
+Value: cheapest bring-your-own-bar Smith attachment in its class at $599 shipped, versus $650-1,000+ for Bulletproof VTS/VTS Light and Bells' BOB (Gluck's Gym)
+Versatility: fits any 3x3 rack and select 2x3 racks with 1" or 5/8" holes, accepts Olympic bars 25-32mm in diameter, and mounts on either side of an upright (Fringe Sport product page)

−Build quality: noticeable side-to-side play, roughly a half-inch to an inch of bar tilt under lateral pressure, though testers say it isn't felt during normal lifting (Kinzi, The Jungle Gym Reviews)
−Build quality: bar clamps use threaded rods and wing nuts that require periodic retightening rather than a tool-free locking mechanism (The Jungle Gym Reviews)
−Versatility: only two fixed latch points (top and bottom via mag pins) rather than a continuous rail, making safety/rack-height setup clunkier and slower than a traditional Smith machine (Gluck's Gym)
−Versatility: mounting consumes one full side of a rack upright, and Fringe Sport's own DNA 1.0/2.0 rack owners can only mount it on the back if they use Fringe's pegboard or storage accessories (Kinzi)
−Build quality: the barbell-insertion wing nut only has a short last-thread range, making it fiddly to get the bar fully seated (Kinzi)

$599.00

Buy Now