Tool · Rack-mount pulley systems
Rack upright size finder
Pick the rack upright size you measured to see its calculated metric size, what it is confused with, the hole sizes makers list and the pulley mounts that list it.
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Pick the upright size you measured to see its calculated metric size, the size it is most often confused with, the hole sizes makers list for it, and the pulley mounts whose makers list it or exclude it.
- 2x2 in uprights
- 2x3 in uprights
- 3x3 in (true) uprights
- 50 mm uprights (sold as "2x2")
- 75 mm uprights (metric "3x3")
Choose your rack upright size to see the key facts and what fits. Each fact links to its source on the full page.
How to measure
Measure the outside width of one upright, across a flat face, and then the diameter of its holes. Fringe Sport gives the same advice: if you are unsure, measure the outside width of one upright.[1] Measure both faces if the tube is not square.
Conversions are arithmetic, not fit tolerances
One inch is exactly 25.4 mm, so 2 inches is 50.8 mm, 3 inches is 76.2 mm and 5/8 inch is 15.875 mm.[2] The finder shows these as calculations from the exact inch. They do not tell you that a mount made for one size will fit the other.
That gap matters. Fringe Sport describes metric "3x3" tubing as about 75 mm (2.95 in) per side and true 3x3 as 3 in per side.[1] Its Sidewing Bottom Pulley fits the metric 75 x 75 mm tubing but, in Fringe's words, will not fit true 3x3 racks.[1] That exclusion is Fringe's, for that product only; other makers set their own.
Labels are not conversions either. SYL Fitness sells its swivel pulley in 50, 60, 70, 75 and 80 mm upright variants, and labels 50 mm as "2x2" and 75 mm as "3x3".[3] Those are the seller's names for its variants, not exact equivalents.
The fields at a glance
| Rack upright size | Nominal size | Calculated metric size | Often confused with | Pulley mounts listing this size |
|---|---|---|---|---|
| 2x2 in uprights | 2 x 2 in | 50.8 mm per side, calculated from 25.4 mm per inch | 50 mm tubing, which SYL Fitness labels "2x2" | Fringe Sport Sidewing Bottom Pulley |
| 2x3 in uprights | 2 x 3 in | 50.8 x 76.2 mm, calculated from 25.4 mm per inch | Not confirmed | Fringe Sport Sidewing Bottom Pulley; Surplus Strength UPS Low (lower crossmembers with a top height of at least 6.75 in) |
| 3x3 in (true) uprights | 3 x 3 in (true 3x3) | 76.2 mm per side, calculated from 25.4 mm per inch | Metric "3x3" tubing of about 75 mm (2.95 in) per side | Valor RG-26 (Valor 3x3 rigs, BD-58, BD-57); Surplus Strength UPS Low (3x3 or 2x3 lower crossmembers at least 6.75 in tall) |
| 50 mm uprights (sold as "2x2") | 50 x 50 mm, labeled "2x2" by SYL Fitness | About 1.97 in per side, calculated from 25.4 mm per inch | True 2x2 in tubing (50.8 mm) | SYL Fitness rack-mounted swivel pulley (50 x 50 mm variant) |
| 75 mm uprights (metric "3x3") | 75 x 75 mm, often sold as 3x3 | About 2.95 in per side, as Fringe gives it | True 3x3 in tubing (76.2 mm, calculated from 25.4 mm per inch) | Fringe Sport Sidewing Bottom Pulley; SYL Fitness rack-mounted swivel pulley (75 x 75 mm variant, labeled 3x3) |
Next steps
Size is only one check. A mount's maker must also list your rack, its base and its hole size: read 2x2, 2x3 and 3x3 vs metric uprights for pulley mounts, then open your exact setup in the cable setup finder.
- 2x2 in uprights
- 2x3 in uprights
- 3x3 in (true) uprights
- 50 mm uprights (sold as "2x2")
- 75 mm uprights (metric "3x3")
Choose your rack upright size to see the key facts and what fits. Each fact links to its source on the full page.
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Questions
Is 75 mm the same as 3x3?
No. Three inches is exactly 76.2 mm, and Fringe Sport says its Sidewing fits metric 75 mm "3x3" tubing but not true 3x3 racks.[2][1]
Is a 50 mm upright the same as 2x2?
Close, but not equal: 2 inches is exactly 50.8 mm. SYL labels its 50 mm variant "2x2", which is a variant name, not a conversion.[2][3]
Where do I measure?
Across the outside of one upright, on a flat face, as Fringe Sport advises. Then measure the hole diameter.[1]