SIXPACK EVO RAIL ULTRA SADDLE REVIEW

September 4, 2026

Sixpack is a German mountain bike component manufacturer that produces everything from saddles to chain guides. As a smaller brand, they have the freedom to go their own way, and the Evo Rail Ultra Saddle is a great example of that. Instead of a traditional saddle rail interface, Six Pack uses a one-piece fiber-reinforced polyamide base-and-rail combination with a rear-loading design that simplifies installation and delivers an incredibly low overall weight.

I have been testing the 140mm version of the Sixpack Evo Rail Ultra for the past two months, and now it’s time to report back.

ABOUT THE EVO RAIL ULTRA SADDLE

The Sixpack Evo Rail Ultra Saddle is designed for everything from gravel and trail to enduro and downhill riding, and is compatible with most standard top-mount seatposts. It’s available in both 140mm and 160mm widths to accommodate different sit-bone sizes and rider preferences. Both versions share a compact length of 246mm and retail for $148.85.

The weight comes in at a very impressive 148g for the 140mm and 150g for the 160mm width version. It uses Sixpack’s own easy-mounting system, allowing you to slide the saddle into the seatpost from the rear, without removing the top clamp. The saddle uses a durable one-piece fiber-reinforced polyamide shell with integrated rails, helping achieve the impressive weight figures. Sixpack claims this can also provide finely tuned flex characteristics for comfort on rough terrain.

You’ll find comfortable E-TPU padding throughout, with a unisex pressure-relief cutout in the center. An M5 threaded insert on the underside allows you to mount accessories such as a rear light, saddle bag, or even an action camera.

THE DIRT

I tested the 140mm Sixpack Evo Rail Ultra Saddle, which was a perfect fit for my smaller sit bones. The short length gave it a compact, out-of-the-way feeling on descents while leaving enough room to move forward and back when seated.

I also liked the overall shape, which remained supportive regardless of where I was sitting. The nose is on the wider side, but I liked the more secure feeling it provided, as overly narrow saddle noses have become something I dislike.

Perhaps my favorite part of the Evo Rail Ultra Saddle is the easy mounting system. Second only to internal cable routing, installing a saddle is my least favorite part of building a bike. Traditional rail clamps can be fiddly and time-consuming, without offering any real advantage. After using the easy mounting system, I think this style of mounting should be far more common on premium saddles. It works really well.

One common source of climbing-related creaks is the pad-to-rail interface. Because the Evo Rail uses a one-piece pad and rail design, it eliminates this potential source of noise. I didn’t experience any creaks during testing, although only long-term use will tell whether that advantage really holds up.

Visually, the compact profile suits modern trail and gravity bikes while also staying out of the way on descents. My only real complaint is that the seating material is quite grippy. While this can make it easier to keep the position in the saddle, it can also make it harder to make small position adjustments while pedaling. I can’t comment on super long-term durability, but the saddle material seems robust enough to handle plenty of laps.

The Wolf’s Last Word

If you prioritize low weight, a compact shape, and one of the easiest saddle installation systems on the market, the Sixpack Evo Rail Ultra is an easy recommendation. Riders looking for maximum comfort on all-day rides may want something with more padding and flex, but for aggressive trail, enduro, and downhill riding, it’s a compelling option.

Price: $148.85 / €129.95
Weight: 148g (140mm)
Website: Sixpack-racing.com

ABOUT THE WOLF

Ethan is a 19-year-old college student originally from Mill Valley, California, and now based in Bellingham, Washington. He began mountain biking at a young age on Mount Tamalpais, widely recognized as the birthplace of modern mountain biking. Today, he spends most of his time riding the trails of Bellingham and British Columbia’s Sea to Sky Corridor. Always experimenting with his bike, Ethan is constantly refining and dialing in his setup in search of the perfect ride. While he’s a very average rider, he has a keen eye for bike performance and quickly recognizes the strengths and weaknesses of a product.

Rank: Contributor
Size: 5’11” / 180cm | 145lbs / 65kg
Social: @ethanrevitch

SUPPORT AND JOIN THE LOAM WOLF PACK

Want to test products for The Loam Wolf or be a Guest Tester at one of our Shootouts? Join here and be entered into monthly giveaways, have access to industry discount codes, sneak peaks of new products and more!

This is a new and positive MTB community that directly impacts future of MTB product development, shares helpful tips, setup suggestions and more.

Check out our NEW community here.