W25i Alu Rear Wheel 11S

  • Straightforward tubeless installation
  • Outward-facing, massively enhanced rim flanges
  • Self-retaining spoke nipples
  • Special grease filling of the hub bearings
  • 25 % higher water absorption of the bearing grease
  • Identical spoke angles left and right
  • Tooth lock washers with 24 teeth
  • SmoothFit rim base profile - even more durable than solutions in the past
  • Intended usage: Gravel, Road
  • Version: Rear
  • Axle standard (mm): 142x12
  • Rim material: Aluminum
  • Maul wide (mm): 25.0
  • Freehub body: 11S
  • Tubeless ready: Yes
  • Hub color: Black CNC-Finish
  • Max. system weight (kg): 130
  • Hub type: Syntace Straight RS Rear
  • Rim color: Black
  • Hollowtech II: yes
  • Weight (g): 876


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Made for any path imaginable. The new gravel wheelset.

The third generation of the Syntace W-Series Aluminum wheelset. The 25mm width rim in combination with the all-new Syntace Straight RS gravel hub is the perfect choice for any terrain and any weather condition.

Welded rims instead of cheaper stuck or glued ones

Welding the rims makes for an overall stiffer and smoother rim that leads to more balanced spoke tensions and prevents the wheelset from creaking, even after years.

Symmetrical spoke angles

Identical spoke angles for the front rear, almost identical ones for the EVO3 rear wheel. The design guarantees for longer durabilty and even higher steering precision. One spoke length for the entire wheelset.

Save tubeless latch rim flange

Prevents from a sudden pressure drop while riding at very low tire pressures. The symmetrical rim for the new Boost and EVO3 standard brings the two spoke angles in line with each other.

A light hub with a heavy rim? No thanks!

The overall weight of a wheelsets tells you no more than one half of the story; the MOI is a lot more telling.

This is because it reflects how far the weight of the overall design is placed away from the hub and thus how much it slows you down.

Comparison with an the ­identical overall weight:

  1. Low inertia – the weight is ­close to the hub and does not constantly have to be accelerated.
  2. High inertia – the weight is ­closer to the rim and thus leads to a higher effort.

Consistent speed occurs at no moment

There is no such thing as con­stant speed when riding a bike. With a single pedal revolution already, you generate two tor­que peaks and thus two acceleration moments. At a cadence of 60 revolutions per minute, this equals 120 small accelerations per minute without even hitting an obstacle on the trail that slows down the bike further. This physical force (MOI – Moment of Intertia) is measured in kg·cm2. The higher this number, the more the wheel tries to slow down the acceleration. 

That’s what it’s all about

Handcraft ­quality by robot

  1. The Syntace wheel construction: in cooperation with an internationally leading wheel designer, we have worked on a robot assisted wheel building and centering machine for more than three years. It screens every single spoke tension, saves it and prints a final report. On top of this, a Syntace wheel-building ­expert assesses the quality of every single wheel afterwards.
  2. The Syntace Straight hubs have been designed for 28 straight pull spokes that allow for one single spoke length for the entire wheelset. Finding a replacement spoke has ­become a lot easier this way.
  3. The EVO6 and Boost Standard design in combination with our straight pull hubs lead to a fully symmetrical wheel with ­identical spoke angles on both sides. This solution prevents single ­spokes from being overstressed. 


All three advantages allowed for a wheel design based on no more than 28 spokes which appears to be the perfect solution as to high stiffness, low weight and defect tolerance. In case one spoke breaks, you will come home safely with the remaining 27 spokes.

With a unique 3-step pro­duc­tion procedure, we ­guarantee for handcraft ­quality for every single wheel.

Stronger than the spoke

Thanks to the SmoothFit profile, the spoke socket in the rim has become a lot more resistant against being ripped out. The socket is perfectly aligned with the actual spoke and nipple angle. This makes the entire construction more reliable than common rim bottoms or
solutions with nipple washers that even used to add extra weight to the rim but that did not reinforce it.


he V-shape design is coming directly from the initial founder of outward-bound and massively enhanced rim flanges on mountain bike wheels. The shape has been tested and approved in uncounted series of experience and now features grip grooves to generate ultimate tire interlinking. It is 25 % stiffer and boasts with the performance of of a rim that actually is 2 mm wider looking at the tire width and the adhesion 

Sweden spoke

Our in-house design, computer optimized Syntace Genius 1.7 custom spoke is made from Sweden steel and produced by Sapim.

A particularly careful manufacturing process allows for a shorter, more stable and yet lightweight section in the highstressed parts of the spoke. If needed, the spoke can be ­replaced with a standard straight pull spoke.

Steel inserts

The freehub features patented interlocking steel inserts that transfer the power from the 7075 Aluminum freehub to the cassette. Particularly looking at the high demands of mountain biking, this design prevents cassettes to get stuck as on an Aluminum freehub. The ­inserts can be exchanged easily (Licence American Classic/USA)

Micro adjustment of the hub bearing clearance

The all-new and test stand ­approved hub body is made from 7050 Aluminum and can be fine tuned with the latest design MicroAdjust end caps for tension-free wheel truing.

90 % higher bearing stress resistance

Our former hub bearings (and those of most of our competitors) with the measurement 17x26x5mm can cope with 130kg before they are ­deformed. The new, super ­durable Syntace 30mm ­bearings of the MX hub can handle up to 250kg.

3-times sealed bearings

New double Syntace Duraseal end caps protect the double sealed Syntace precision hub bearings. Filled with grease that features a 25% higher water absorption, corrosion is prevented even further.

10 Years (3+7) Warranty

When damage was caused by material- or manufacturing errors, we repair or replace your wheel or wheel component free of charge for up to 3 years, after that we only charge a 50% fixed rate of the current recommended retail price until the end of year 10 of the warranty. You can find more information here.



Sealing milk advice:

Using sealing milk that contains ammonia causes corrosion damage to your spoke nipples and rims. Make sure to use only ammonia-free sealing milk like e*thirteen Tire Plasma or Continental RevoSealant with your Syntace products.

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