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Sheet updated September 2026
The Ride Engine Momentum V4 is Ride Engine's soft-shell waist harness. It delivers the support of a hard shell without sacrificing your freedom of movement. A molded internal support plate works in your lower back, precisely where Ride Engine places its Lumbar Lock. The rest of the harness remains flexible. Before you order, know that the harness comes without a spreader bar.
KEY INFORMATION
RIDE ENGINE MOMENTUM V4 - Kitesurf Soft-Shell Waist Harness
What we like
- Lumbar Lock Support: The back shape locks your lower lumbar region. A molded internal plate distributes pressure instead of concentrating it on two points.
- Soft Shell, Not Rigid: The Momentum is a soft-shell harness. It supports you without blocking torso rotation, which is crucial for long sessions or frequent turns.
- Direct Connection to the Unity Bar: The strap connects directly to the Unity Spreader Bar, no adapter needed. This harness also accepts a classic strap-closure bar.
- Five Sizes from Ride Engine: Ride Engine offers sizes from XS to XL, with a recommended bar width for each size. We have S, M, and L in stock.
- Bar Sold Separately: Ride Engine specifies this on its product sheet. This is a product line choice, not an oversight. You choose the bar based on your waist size, and you can keep it from one harness to another.
Available sizes
Included / Not included
✔️ Included: 1 Ride Engine Momentum V4 harness
❌ Not included: Spreader bar (sold separately), Kite, control bar, board
DETAILED DESCRIPTION
What the Lumbar Lock Changes
Ride Engine calls the shape of its harness back, combined with a molded internal support plate, Lumbar Lock. The idea is to support the lower lumbar region rather than constricting the waist. A harness that rides up doesn't grip the lower back. The Momentum addresses this issue, which is why it sits between entry-level soft waist harnesses and carbon shells.
Soft-Shell, and Why This Choice Matters
A rigid shell provides better pure traction, while a soft waist harness allows your torso to rotate. The Momentum is a soft-shell. It takes the latter approach, with an internal plate to regain some support. If you primarily ride strapless or surfkite, where torso rotation is constant, this construction is the least restrictive. If you're looking for maximum lock-in for big air, an Elite Carbon holds stronger.
The Spreader Bar: The Crucial Point
Ride Engine sells this harness **without a spreader bar**. The Momentum's strap connects directly to the Unity Spreader Bar, the in-house bar. It also accepts a standard strap-closure bar. Choose the width based on your waist size: 8 inches up to approximately 86 cm, 10 inches above that, and 12 inches for larger body builds. The table above provides the complete correspondence. We have the Unity Mega Spreader Bar in stock; it is offered as an accessory below this product description.
Choosing Between Two Sizes
The Ride Engine sizing intentionally overlaps. A waist size of 84 cm falls into both S with a 10-inch bar and M with an 8-inch bar. The former tightens higher and holds better, while the latter allows more range of motion. Between the two, your riding style is the criterion: tighten for jumping, loosen for surfing. A fitting in Pornichet will decide in five minutes, with the harness on and the bar mounted.
SIZE GUIDE
| Size | Waist size (cm) | Waist size (inches) | Recommended bar |
|---|---|---|---|
| XS | 60-66 | 24-26 | 8-inch |
| S | 66-76 | 26-30 | 8-inch |
| S | 78-84 | 31-33 | 10-inch |
| M | 81-86 | 32-34 | 8-inch |
| M | 84-91 | 33-36 | 10-inch |
| L | 89-94 | 35-37 | 10-inch |
| L | 94-99 | 37-39 | 12-inch |
| XL | 99-112 | 39-44 | 10-inch |
TECHNICAL SPECIFICATIONS
| Specifications | |
|---|---|
| Product | Ride Engine - Momentum V4 |
| Type | Kitesurf waist harness, soft-shell construction |
| Support | Lumbar Lock, molded internal support plate |
| Bar Connection | Strap, direct connection to the Unity Spreader Bar, compatible with strap-closure bars |
| Spreader bar | Not included, sold separately |
| Range Sizes | XS, S, M, L, XL |
| Sizes in Stock | S, M, L |
FAQ - RIDE ENGINE MOMENTUM V4
This harness is for kitesurfers who find soft waist harnesses too flexible in the lower back. It's also for those who find carbon shells too rigid in the torso. This harness is for long sessions, freeride, and big air, and it still offers excellent mobility. For pure wingfoil, where the traction is lower and more constant, a thinner model is often sufficient.
No. Ride Engine explicitly states on its product sheet that the bar is sold separately. The harness connects via a strap to the Unity Spreader Bar, which is available from us, or to a classic strap-closure bar. Choose the width based on your waist size.
The size guide on this product sheet provides the waist circumference and recommended bar width for each size. Measure at your high hips, with the harness worn low. We have S, M, and L in stock. XL and XS can still be ordered.
Rinse your harness with fresh water after each session. Dry it flat or hang it in the shade; never dry it on a radiator. Clean the Velcro with a hose. Trapped sand is the first thing that wears it out. Check the condition of the bar's attachment straps once per season.
You need to try on a harness with its bar. The bar width is best decided in person. We are in Pornichet, in Loire-Atlantique, and we ride the same spots as you.
▶ 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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