BLACK FRIDAY 2025 — Up to $399 in Savings
Best price of the year. Don’t miss your ride upgrade. Learn More

AERIX PRO RS52

AERIX PRO RS52 – Light. Fast. Unstoppable

Starting at:
299.00 USD

The AERIX PRO RS52 is a 52mm road rim engineered to deliver the perfect balance of climbing efficiency and aerodynamic speed.

With its exclusive Fiber-Continuous Spoke Hole Design and bowl-shaped spoke seat platform, every spoke sits perfectly, making wheel building easier and ensuring long-lasting, rock-solid durability.

A smart front–rear layup keeps the front rim feather-light and agile at 335g, while the rear rim maximizes power transfer at 370g, giving you explosive acceleration and stable handling.

Each rim exceeds expectations by passing UCI impact testing at 90J (no tire mounted) — double the official requirement — with zero fractures or delamination.

Thanks to precise roundness, optimized carbon layup, and advanced mold design, the RS52 is not just lighter — it’s stronger than many ultra-light competitors, giving you the confidence to push harder, climb faster, and ride longer.

Front–Rear Differentiation for Balanced Performance

The AERIX PRO RS52 employs a differentiated layup strategy to achieve the ideal balance between weight, compliance, and power transfer:

Front (335g): Lightweight and compliant, optimized for precise steering and agile handling.
Rear (370g): Reinforced for efficient torque transfer and higher load capacity.

Load Rating:

Front rim(335g) + rear(335g) recommended for riders under 100kg
Front 335g + Rear 370g combination: supports up to 115kg total rider system weight

The default is 25mm inner width, If you prefer the 23mm inner width or a different front–rear weight combination, please specify it in the order notes.

For a detailed look at the design philosophy, testing standards, and real-world advantages behind the RS52.

Explore more

Specification
Technologies
Related Products

Weight:

Premium: 370 +/-15g / Extralight: 335g

Material:

Toray T800 + T1100 Carbon Fiber

Available Size:

700C

ERD:

533mm
( Does not include the nipple )

External Width:

30mm

Inner Width:

25mm (default) or 23mm

Depth:

52mm

Rim Type:

Clincher

Max Spoke Tension:

130kgf

Max Rider Weight:

Extralight: 100kgs ; Premium: 120kgs
Front Extralight + Rear Premium: 115kgs

Max Tire Pressure:

110psi

Hole Count:

20H or 24H

Weave:

Finish:

Coating Free / Matte / Glossy

Tubeless Compatible:

Yes

Application:

Road, Cyclocross, Gravel

Warranty:

5 years

Technologies

Fiber-Continuous Spoke Hole Design

Traditional carbon rims often require post-production drilling for spoke holes, which can compromise fiber continuity and create stress concentration areas.
Fiber-Continuous Spoke Hole Design, reinforced during the layup stage for continuous fiber alignment and even stress distribution.

Smooth Inside Wall

The traditional inflatable bladders used by many manufacturers to maintain the rim's shape during the molding process lack the ability to closely control the final shape of the rim. As a result, although most carbon rims appear smooth and seamless on the outside, they are marked by irregularities and weaknesses on the inner surface of the rim. Each irregularity is a potential point of failure.
Using a molding process we call ''SLW'', BTLOS employs proprietary high-pressure bladders and specific solid silicone forms to tightly control rim shape, producing virtually void-free rims with perfectly smooth walls (inside and out) resulting in finished rims that are truer, lighter, stronger, more durable rims and wheels.
USED FOR: Premium Series

Spoke Hole Angles

BTLOS can drill spoke hole angles to match or compliment the spoke angles created by the hub flange (as provided by the customer). Matching the spoke hole drilling angle in the rim to the spoke angle of the hub/hub flange allows the nipple to be better aligned with the spoke when the wheel is tensioned resulting in fewer broken spokes and nipples.
USED FOR: Premium Series / Standard Series

Graphene Special Braking Surface

By incorporating graphene into our design we are able to increase braking power by 50% in all conditions while limiting heat build-up to less than 150 degrees. These improvements lead to a more durable, stronger brake track along with improved braking performance in wet conditions and during long descents. Our new brake track can also include a patterned surface specific to customer requirements or specifications. (OEM service available). Learn More
USED FOR: Premium Series

Super High TG Braking Surface

Extremely high heat resistance at the brake, testing TG values up to 250 degrees at 100pis test conditions. Ordinary rim TG can only reach 180 degrees.
USED FOR: Premium Series / Standard Series

One-Piece Molding

Since the rims do not have the weaknesses associated with the various components of any of the different designs, they are continuously molded using techniques known as "one-piece molding". Because of this, the rims are perfectly symmetrical and evenly rolled.
USED FOR: Premium Series / Standard Series

High TG Epoxy Resins

BTLOS uses the highest TG epoxy resin to increase rim resistance to high temperatures created under braking. Our exclusive nano-resin formula combined with Toray's new ULTRA series products guarantee that the rims are resistent to heat build up and that they retain 100% of their rigidity regardless of the conditions while also saving weight vs. traditional TG resins.
USED FOR: Premium Series / Standard Series

Twine Tec

Twine technology can solve the problem of using a material with insufficient ductility to produce a full three-dimensional surface product that is prone to local tearing or wrinkling of the material. This will ensure even balance of weight and strength around the circumference of the rim.
USED FOR: Premium Series / Standard Series

ISO-Etrto Compliant

Internationally standardized tire bead and rim sizing. This ensures that the fit and relationship between a rim and a tire are as secure as possible.
USED FOR: Premium Series / Standard Series

Outstanding Materials

The finest carbon sheets are selected based on years of knowledge and experience. Superior workmanship is executed and ensured by well-trained factory staff.
USED FOR: Premium Series / Standard Series

3D Drilling

A computer controlled drilling machine ensures accurate drilling that can be replicated time after time.
USED FOR: Premium Series / Standard Series

U shape

Modern more rounded U shape profile has enabled aerodynamics, which means improved traction while reducing the rolling resistance.
USED FOR: Premium Series / Standard Series

Tubeless Compatible

It is suitable for tubeless tires. This makes it possible to achieve a smaller overall system weight while improving puncture resistance. The precision diameter achieves a reliable tubeless performance. <br>USED FOR: Premium Series / Standard Series

Two Carbon Fiber Types

Rims made from different types of carbon fibers may thus be characterised by greater stiffness and strength. Therefore, in order to provide you with the best possible rims, we use two different types of carbon fiber (Toray T700, Toray T800) in the production of BTLOS rims. BTLOS premium rims are a combination of T700 and T800 carbon fibers.
USED FOR: Premium Series / Standard Series

Extra Carbon Fiber Strip

Around the spoke holes, each rim is reinforced with an extra carbon fiber rod. Its precise arrangement allows for the greater tension of the spokes, which results in a high rigidity of the rims.
USED FOR: Premium Series / Standard Series

Quality Control Systems

We believe the reliability, and consistent quality of our products has the best value in the industry. In order to ensure that BTLOS rims not only meet international safety requirements but also comply with additional, higher quality standards, we use SGS and EN 14781 standards when manufacturing rims.
USED FOR: Premium Series / Standard Series

Double Triangle Design

The BTLOS bead seat/sidewall interface is created for the tire bead based on the structural advantages of a triangle. This solution increases the strength and ability of the of the rim to withstand impact. Further, the triangular shape of this design also ensures the stability of the rim sidewall under hard braking while delivering excellent strength-to-weight performance.
USED FOR: Premium Series / Standard Series

Ultralight Construction

BTLOS applies firsthand knowledge and research, along with industry-leading materials and technologies to create rims and wheels that are optimized to deliver extremely light weights without sacrificing the strength and durability demanded by the world's best riders.
USED FOR: Premium Series

Flatness And Roundness

BTLOS employes molding and manufacturing techniques which allow us to control rim flatness to within 0.15mm and roundness to withing 0.2mm making it incredibly easy to build perfectly true, strong wheels.
USED FOR: Premium Series

Stiffness

BTLOS considers the intended application of each rim design, tailoring the relative stiffness of our rims to achieve maximum power transfer.
USED FOR: Premium Series / Standard Series

45 Degree Overlap

A lay-up process where by carbon layers are stacked/overlapped at 45-degree angles creating very high lateral stiffness and improved impact resistance while maintaining responsiveness and efficiency under power.
USED FOR: Premium Series / Standard Series

CNC Cutting Material

Computer Controlled machinery is used to plan, format and cut carbon sheets in order to achieve the most efficient use of materials and to control costs while also making measurements and cuts controlled within 0.1mm allowing us to deliver outstanding lay-up consistency on each and every rim we build.
USED FOR: Premium Series / Standard Series