<img src="https://bikerumor.com/wp-content/uploads/2026/05/new-E13-Flux-wheels-1536×1025.jpg" width="1536" height="1025" alt="(Photos/e*thirteen)“>
e*thirteen has been on a bit of a tear in recent weeks. The brand released the Sidekick 2.0 hubs last month, followed by radial tires just a few weeks later.
Adding to its announcements of new products, e*thirteen announces new Flux wheels to spin out those Sidekick 2.0 hubs. The wheels, available in both carbon and aluminum, cover a full range of riding styles, from lighter trail riding to downhill.
And e*thirteen also wanted to cover a wide range of price points, offering a wheelset for nearly every tier level. So, the result is a Sidekick-equipped anti-kickback wheelset for less than $600. Wow!
e*thirteen Flux MTB wheels with anti-kickback Sidekick inside
e*thirteen moved away from a traditionally-shaped rim profile for the new Flux Wheels. Instead, they opted for a concave-shaped rim, providing extra vertical compliance. e*thirteen also claims that the new shape improves traction, reduces deflection, and better absorbs trail chatter. Testing of the new Flux Wheels shows a 33% increase in angular deflection compliance. Vertical deflection followed suit, with a 19% increase in compliance.
Sounds great, right?
As is becoming the norm, e*thirteen designed the Flux rims with a 30mm inner width. The wheels are also front- and rear-specific. Front rims feature maximum compliance and traction, while rear rims are designed for durability.
e*thirteen achieves rim-specificity with different carbon layouts and rim thickness. And it seems the difference between the alloy rims is a welded or sleeved joint.
What’s new?
There are four different Flux wheel categories:
For lighter-duty trail, e*thirteen designed the Optimus. These wheels feature the Flux 33 (F) and Flux 43 (R) rims laced to Sidekick Pro SP hubs. These Optimus wheels are only offered at the Pro Carbon level.
Stepping up to longer trail and all-mountain bikes, e*thirteen has the Sylvan wheels. These feature the Flux 43 and 54 rims (F/R) and a Sidekick hub. All three build levels are offered: Aluminum, Pro Aluminum, and Pro Carbon.
Pro-level builds feature the latest Sidekick Pro SP hub.
Next are the Grappler wheels, both Enduro EN and DH.
The Grappler EN also features all 3 build levels (Aluminum–Pro Carbon), with Sidekick Pro SP hubs and Flux 54 and 55 rims (F/R).
Jumping to (or dropping in on?) the Grappler DH, e*thirteen beefs them up a bit with the Flux 66 rims front and rear. Here, they only offer a Pro Aluminum and Pro Carbon build, both featuring the Sidekick Pro SP hub.
The complete Flux lineup is also compatible with Class 1 e-bikes.
Flux Wheel Details & Affordable Pricing
- Sidekick Flux Aluminum Wheelsets: Starting at $600€/set (same prices in USD or EUR)
- Sidekick Flux Pro Aluminum Wheelsets: Starting at $800€ per wheelset
- Sidekick Flux Pro Carbon Wheelsets: Starting at $1,650€ per pair
e*thirteen offers a smaller 27.5-inch rear-wheel option on each set except the 29er-only Optimus. They also offer Super Boost spacing on some of the lineup, so check the website for more details.
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