ProX 700C Carbon Clincher Rims 29mm Outer Width | 23mm Inner Width Road Disc Brake Rim Tubeless Ready

29mm outer (23mm inner width), fit 700C 28C–50C tires
Optional rim depths: 38mm / 45mm / 50mm / 55mm / 60mm
Toray T800 + T700 carbon fiber construction
Clincher rim, tubeless ready
Lightweight, stiff, aerodynamic U-shape rim profile
High quality with 2-year warranty

$119.00

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Road Carbon Rims:

RD923-38C (23mm inner width 38mm depth)

RD923-45C (23mm inner width 45mm depth)

RD923-50C (23mm inner width 50mm depth)

RD923-55C (23mm inner width 55mm depth)

RD923-60C (23mm inner width 60mm depth)
Carbon Rim Finish:

Non-Paint UD Carbon

UD Black Matte

UD Black Glossy
Number of Spoke Holes:

20H

21H

24H

28H
PROX Decals On Rims:

No Decal

Black Glossy Decal

White Glossy Decal
Spoke Hole Diameter:

4.5mm (Standard)

2.5mm (For Internal Nipple)
Tubeless Valve (Presta):

No Need

Length 44mm +US$5/pc

Length 60mm +US$5/pc

Length 80mm +US$5/pc

Quantity:

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Description

ProX 700C Carbon Clincher Rims 29mm Outer Width | 23mm Inner Width Road Disc Brake Rim Tubeless Ready

Rim Model	PRD923-38C	PRD923-45C	PRD923-50C	PRD923-55C	PRD923-60C
Rim Sectional Drawing
Carbon Rim Depth	38mm	45mm	50mm	55mm	60mm
Carbon Rim Width	28.5mm Outer (23mm Inner)	28.5mm Outer (23mm Inner)	28.5mm Outer (23mm Inner)	28.5mm Outer (23mm Inner)	28.5mm Outer (23mm Inner)
Rim Weight (+/-3%)	390g	400g	430g	460g	480g
Max Weight Limit	115kg/253lb	120kg/265lb	120kg/265lb	120kg/265lb	125kg/275lb
Carbon Rim Material	Toray T700+T800 Carbon	Toray T700+T800 Carbon	Toray T700+T800 Carbon	Toray T700+T800 Carbon	Toray T700+T800 Carbon
Rim ERD*	564mm	550mm	540mm	530mm	520mm
Spoke Holes	20H/21H/24H/28H	20H/21H/24H/28H	20H/21H/24H/28H	20H/21H/24H/28H	20H/21H/24H/28H
Rim Bead	Hook	Hook	Hook	Hook	Hook
Tire Type	Tubeless or Clincher	Tubeless or Clincher	Tubeless or Clincher	Tubeless or Clincher	Tubeless or Clincher
Tire Size (Recommended)	700x30C-50C	700x30C-50C	700x30C-50C	700x30C-50C	700x30C-50C
Max Tire Pressure	125psi/8.6bar	125psi/8.6bar	125psi/8.6bar	125psi/8.6bar	125psi/8.6bar
Brake Type	Disc Brake	Disc Brake	Disc Brake	Disc Brake	Disc Brake
Spoke Tension (For Wheel Building)	120-150kgf	120-150kgf	120-150kgf	120-150kgf	120-150kgf

ERD*

Effective Rim Diameter (ERD) is the maximum distance that spokes need to bridge going from one end of the rim to another. How do we calculate the ERD of our rims? The corresponding equation and a drawing is as shown:
ERD=OD-(rim depth)*2+(rim thickness)*2

For example:
ERD of PRD923-38C rim=633mm-38mm*2+3.5mm*2=564mm
Most people prefer ERD including the length of the nipple cap. However, customers may use different nipples and components for building. Please add the height of the nipple cap(2.5mm~3mm generally) for your spoke calculation. If the height of the nipple cap is 3mm, then ERD of your PRD923-38C rim is: 564mm+3mm*2=570mm

A: Rim nipple bed thickness (=3.5mm)
B: Length of nipple cap (2.5mm~3mm generally)

ProX 29mm Wide (23mm Inner Width) Road Disc Brake Carbon Rim Features
A new 23 mm internal-width carbon road rim has been developed for riders who demand higher performance from their equipment. Carefully optimized for aerodynamic efficiency and offered in five depth options (38/45/50/55/60mm), this rim series expands the possibilities for modern road wheel design. Built to match current road cycling trends, the wider rim profile accommodates larger tires ranging from 30 mm to 50 mm. This configuration improves traction, ride comfort, and overall stability while reducing the likelihood of pinch flats. Riders will experience smoother cornering and increased confidence during high-speed descents.

Aerodynamic Performance with Multiple Depth Options

Different rim heights allow riders to tailor performance to their riding style and terrain.
38mm: A lightweight option optimized for climbing and rapid acceleration. Ideal for riders who prioritize responsiveness and efficiency on steep terrain.
45/50mm: Well-balanced all-round depths that combine aerodynamic benefits with manageable weight. Suitable for varied riding conditions, from endurance rides to aggressive solo efforts.
55/60mm: Deeper profiles focused on maximum aerodynamic advantage. These rims help maintain speed on flat roads, time trials, and sprint efforts while remaining manageable in crosswinds.

	Carbon Fiber Material Our carbon road rims are manufactured using premium Toray T700 and T800 carbon fiber, combined with a stable resin system to ensure consistent quality and a lightweight structure for road cycling.		Light Weight Design A carefully engineered lay-up structure using Toray T700 and T800 carbon prepreg enables a lightweight rim design. Excess material is minimized to reduce weight, while reinforcement around the spoke holes ensures structural strength. The result is low weight without compromising strength or stiffness.
	Wider Inner Width With a 23mm internal width, these carbon rims are optimized for modern 700×30C–35C tires and remain compatible with even wider tires. The increased width provides better tire support, simplifies installation and removal, and enhances traction and cornering stability.		Aero U-Shape Profile The wide U-shaped rim profile offers improved aerodynamic efficiency compared to traditional V-shaped designs, helping to reduce drag at higher speeds. It also enhances airflow stability in crosswinds, while contributing to increased stiffness and overall structural strength.
	Bead Lock Design Subtle ridges along both sides of the rim channel—known as bead locks—help facilitate easier tubeless tire inflation. Combined with a hooked bead design, they ensure a secure tire fit and reduce the risk of blowouts.		Tubeless Ready Tubeless setups are increasingly popular for road cycling due to improved grip, lower rolling resistance, and enhanced comfort. All of our carbon clincher road rims are tubeless compatible while still supporting standard inner tubes. An optimized anti-burp profile ensures straightforward tire installation, removal, and inflation.
	Disc Brake Disc brake systems offer more precise and consistent braking performance compared to rim brakes. These rims are specifically engineered for disc brake use, eliminating the need for a brake track and avoiding heat-related issues. A dedicated carbon lay-up further improves durability while keeping weight low.		2-Year Warranty Our production process includes strict quality control and comprehensive testing to ensure reliable performance. All ProX carbon rims and wheelsets are backed by a 2-year warranty from the date of delivery. Full details are on our Warranty Policy page.