Sheet updated September 2026
The F-One Bladder S1 Strike V4 4.5 m² is the replacement strut bladder for your F-One Strike V4 wing in 4.5 m². This is an original F-One part. Each bladder is designed for a specific model, year, and size. This one fits only the Strike V4 in 4.5 m², and only the strut. A leak in the strut doesn't mean the end for your wing; you can easily replace the bladder.
KEY INFORMATION
F-ONE BLADDER S1 STRIKE V4 4.5 M² - Replacement Strut Bladder
What we like
- Original part: This bladder features the same design, welds, and valve as the one installed at the factory.
- A saved wing: A strut leak might cut your session short, but it won't ruin your wing. The bladder is replaceable.
- Exact size: Designed specifically for the 4.5 m² wing, it installs smoothly without forcing or creasing.
- Accessible repair: You can replace this bladder at home with a bit of patience and some talcum powder.
- Keep dry: Stashing a spare bladder in your travel bag means you won't lose a week of sessions.
Available sizes
Included / Not included
✔️ Included: 1 S1 strut bladder
❌ Not included: Leading Edge bladder, Talc, and tools
DETAILED DESCRIPTION
When to change a strut bladder
If your wing's strut slowly deflates while the Leading Edge holds pressure, if the strut stays soft, or if you hear a leak near a weld, your bladder is punctured. A patch might hold for a season on a small tear. However, if the leak is on a weld or near the valve, replacement is the only lasting solution. This S1 bladder is for the strut of the F-One Strike V4 in 4.5 m².
How to replace it properly
Deflate the wing, open the strut zipper, and carefully remove the old bladder. Make sure to note the direction and valve position. Lightly talc the new bladder, then insert it gradually without twisting. Inflate it slightly to ensure it unfolds without creases, then close the zipper. Check that it holds pressure overnight before your next session. If you have any doubts about your wing's size or year, please call us before ordering.
SIZE GUIDE
| Size | Kite | Position |
|---|---|---|
| 4.5 m² | Strike V4 4.5 m² | Strut S1 |
TECHNICAL SPECIFICATIONS
| Specifications | |
|---|---|
| Type | Strut bladder, spare part |
| Kite | F-One Strike V4, 4.5 m² |
| Position | Strut S1 |
| Manufacturer | F-One, original part |
| F-One Product Code | 77241-9125 |
FAQ - F-ONE BLADDER S1 STRIKE V4 4.5 M²
It's for the F-One Strike V4 in 4.5 m², and only for the strut. A Leading Edge bladder, a different model year, or a different size will not fit.
If the strut deflates while the Leading Edge holds air, inflate the strut by itself. Then, submerge it or apply soapy water to the welds and valve. A leak on a weld requires replacement, while a small puncture in the material can be fixed with a patch.
We are a kite, wing, and Surf shop in Pornichet, on the Atlantic coast. We are open all year. Our stock is real, and shipments leave directly from the shop. Our team answers the phone and emails. If you have any questions about sizing or compatibility, please call us before ordering.
▶ Need advice?
GlissEvolution, 2c avenue du Gulfstream, 44380 Pornichet (Loire-Atlantique)
09 62 64 74 77 | WhatsApp: 07 83 28 39 94, Tuesday to Saturday, 10am-1pm / 3pm-7pm
Test center available by appointment
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