Rack upright size
75 mm metric "3x3" rack uprights: fit and pulley mounts
How metric 75 mm "3x3" tubing differs from true 3x3, the hole sizes Fringe lists for it, and which pulley mounts name a 75 x 75 mm fit.
Also listed as metric 3x3, 75 x 75 mm tubing
Short answer
Metric "3x3" tubing is about 75 mm (2.95 in) per side, per Fringe Sport, against 76.2 mm for a true 3 in upright. Fringe's Sidewing Bottom Pulley fits metric 75 x 75 mm with 1 in or 5/8 in holes and not true 3x3, and SYL Fitness sells a 75 mm pulley variant labeled "3x3".
Key facts
- Nominal size
- 75 x 75 mm, often sold as 3x3[1]
- Calculated metric size
- About 2.95 in per side, as Fringe gives it[1]
- Hole sizes makers list
- 1 in or 5/8 in (Fringe's Sidewing compatibility list)[1]
- Pulley mounts listing this size
- Fringe Sport Sidewing Bottom Pulley; SYL Fitness rack-mounted swivel pulley (75 x 75 mm variant, labeled 3x3)[1][3]
- Mounts that exclude it
- Not confirmed
- How to check yours
- Measure the outside width of one upright, as Fringe advises: about 75 mm is metric, 3 in (76.2 mm) is true 3x3[1][2]
- Not confirmed
- Not confirmed
Watch out for
- A pulley made for true 3x3 is not stated to fit 75 mm tubing, and Fringe's Sidewing does not fit true 3x3: match the maker's stated size.
- Fringe's 75 mm fit covers 1 in or 5/8 in holes only.
- SYL's "3x3" label on its 75 mm variant is nominal; 3 in is 76.2 mm.
Questions
Is metric 3x3 the same as true 3x3?
No. Fringe Sport describes metric 3x3 as about 75 mm (2.95 in) per side and true 3x3 as 3 in per side, which is 76.2 mm. Its Sidewing Bottom Pulley fits the metric size but not true 3x3.[1][2]
Which pulley mounts list 75 mm uprights?
Fringe Sport lists its Sidewing Bottom Pulley for 75 x 75 mm tubing with 1 in or 5/8 in holes, and SYL Fitness sells a 75 x 75 mm swivel pulley variant.[1][3]