Fringe Sport Wonder Woman Bar
A 15 kg bar whose yield strength is published higher than its tensile — an unusual pair of numbers worth understanding before you buy.
Specs
| Weight | 33 lb (15 kg) |
|---|---|
| Shaft diameter | 25 mm |
| Overall length | 79 in |
| Sleeve length | 12.5 in |
| Weight capacity | 1,000 lb |
| Knurl | Dual, double ring, IWF and IPF |
| Center knurl | None |
| Whip | Stiff |
| Sleeve rotation | Bushing (moderate) or bearing (fast) |
| Tensile strength | 160,000 PSI |
| Yield strength | 199,000 PSI |
| Material and finish | Alloy steel, black zinc plated |
These figures are copied from Fringe Sport’s own published specs and were last checked on 2026-08-31. Manufacturers revise products without notice, and variants differ. Confirm anything your decision depends on with Fringe Sport before you buy.
Choose this one if
- You want the choice between bushings and bearings rather than whatever ships
- You want a stiff 15 kg bar for pressing and pulling rather than a whippy one
- You want a 25 mm shaft with no centre knurl at all
The detail
Fringe publishes both a tensile and a yield figure on this bar, which almost nobody does — and here they come out the unusual way round: yield 199,000 PSI against tensile 160,000. Yield is normally the lower number, because steel bends before it breaks. Read as published, this bar resists permanent bending to a higher stress than it resists fracture, which is not how steel usually behaves.
The practical read is that both numbers are high enough for a 15 kg bar rated to 1,000 lb, and the bar that matters more day to day is yield — bending is the failure that actually happens in a home gym, and a bent bar is a dead bar. If you are choosing between this and the Colorado 15 on steel alone, ask Fringe to confirm the pairing rather than inferring from it.
The stiff whip rating is the real differentiator, and it is consistent with their Wonder Bar: Fringe builds rigid bars. For pressing and pulling that is what you want. For catching a clean it is not — a stiff 15 kg bar transmits more of the load to your wrists than a whippy one.
No centre knurl at all is the right call on a women's bar, where the shirt-grab problem is worse and the low-bar squat use case rarer.
The bushing-or-bearing choice is genuinely useful. Take bushings unless you snatch and clean regularly — they cost less, spin slower, and shrug off the chalk and grit that shorten a bearing's life in a garage.