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

• Modern road carbon rims with 23.5mm Inner Width

• Depth options: 35/45/50/55/60/65/85mm

• Fit 700C x 30C-50C tires

• Tubeless ready

• Wide U shape design, more aero and stiff

• High quality, 2-year warranty

  • Brand:

    PROX
  • Item NO.:

    RD923
  • Payment:

    Paypal, Bank Transfer
  • Origin:

    China
  • Color:

    UD/3K/Marble(Customized Decal Acceptable)
DESCRIPTION

Widened 23.5mm internal width carbon fiber road rim is introduced. designed for cycling riders who refuse to settle. Aerodynamically optimized and available in multiple depgth (35/45/50/55/60/65/85mm), this rim series redefines what’s possible on the road.
Designed for modern road bike riding, the wider rim profile supports larger tires (30-50mm size) effortlessly, enhancing grip, comfort, and stability. Say goodbye to pinch flats and hello to smoother cornering and confident descents.

carbon road bicycle rims for 30~50c tires

Aero Efficiency Meets Versatility: Choose your weapon
35/45mm: The ultimate climber’s choice—feather light, responsive, and perfect for climbing.
50/55mm: The balanced all-rounders—agile enough and aerodynamic enough for solo breakaways.
60/65/85mm: Speed demons rejoice. Maximize aerodynamic gains on flats, time trials, and sprints with minimal crosswind compromise.


Two carbon layup options to match your riding goals and body weight:
SL (Super Light T700+T800): All-round durable carbon rims supporting riders up to 115kg. Perfect for daily training, long tours and heavier cyclists, balanced lightweight & rugged reliability.
UL (Ultra Light T800+T1000): Premium high-modulus lightweight upgrade with drastically reduced rotational weight, limited to riders under 95kg. Built for competitive racers, climbers and smooth-road race performance.

ProX decal/logo is offered for free as showed in ProX decal page if decal in stock. The decal will be applied on the rim and do the matte or glossy finish according to customers’ preference. You can choose either with ProX decal or simply without decal (UD black matte or UD black glossy finish). Your next breakthrough starts here: wider, faster, smarter.

SPECIFICATION

ProX Road Disc 23.5mm Inner Width Disc Brake Carbon Road Rims 700C Tubeless Ready

Model
RD923-35SL
RD923-35UL
RD923-45SL
RD923-45UL
RD923-50SL
RD923-50UL
RD923-55SL
RD923-55UL

RD923-60SL

RD923-60UL

RD923-65SL
RD923-65UL
RD923-85SL
RD923-85UL
Terrain(Recommended) Road Road Road Road Road Road Road
Material
SL:T700+T800
UL: T800+T1000
SL:T700+T800
UL: T800+T1000
SL:T700+T800
UL: T800+T1000
SL:T700+T800
UL: T800+T1000
SL:T700+T800
UL: T800+T1000
SL:T700+T800
UL: T800+T1000
SL:T700+T800
UL: T800+T1000
Weight(±15g)
SL:385g
UL: 350g
SL:420g
UL: 375g
SL:430g
UL: 385g
SL:450g
UL: 410g
SL:480g
UL: 440g
SL:495g
UL: 455g
SL:630g
UL: 590g
Max Weight Limit SL:110kg/242lbs
UL: 90kg/198lbs
SL:115kg/253lbs
UL: 95kg/209lbs
SL:115kg/253lbs
UL: 95kg/209lbs
SL:115kg/253lbs
UL: 95kg/209lbs
SL:115kg/253lbs
UL: 95kg/209lbs
SL:115kg/253lbs
UL: 95kg/209lbs
SL:115kg/253lbs
UL: 95kg/209lbs
Depth 35mm 45mm 50mm 55mm 60mm 65mm 85mm
Sectional Drawing wide bicycle road rim 35mm depth wide bicycle road rim 45mm depth wide bicycle road rim 50mm depth wide bicycle road rim 55mm depth wide bicycle road rim 60mm depth wide bicycle road rim 65mm depth wide bicycle road rim 85mm depth
Outer Width 30mm 30mm 30mm 30mm 30mm 30mm 30mm
Inner Width 23.5mm 23.5mm 23.5mm 23.5mm 23.5mm 23.5mm 23.5mm
Spoke Holes 21H/24H/28H/32H 21H/24H/28H/32H 21H/24H/28H/32H 21H/24H/28H/32H 21H/24H/28H/32H 21H/24H/28H/32H 21H/24H/28H/32H
ERD* 569mm 549mm 539mm 529mm 519mm 509mm 469mm
Rim Bead Hook Hook Hook Hook Hook Hook Hook
Tire Type Tubeless or Clincher Tubeless or Clincher Tubeless or Clincher Tubeless or Clincher Tubeless or Clincher Tubeless or Clincher Tubeless or Clincher
Brake Type Disc Brake Disc Brake Disc Brake Disc Brake Disc Brake Disc Brake Disc Brake
Max Spoke Tension 130kgf  130kgf  130kgf  130kgf  130kgf  130kgf  130kgf 
Max Tire Pressure 125psi/8.6bar 125psi/8.6bar 125psi/8.6bar 125psi/8.6bar 125psi/8.6bar 125psi/8.6bar 125psi/8.6bar
Tire Size(Recommended) 700*30C-50C 700*30C-50C 700*30C-50C 700*30C-50C 700*30C-50C 700*30C-50C 700*30C-50C

Tubeless Valve (not included): 44/60/80mm length optional

Tubeless Valve

calculate the ERD of road rims

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 RD923-35SL rim=633mm-35mm*2+3mm*2=569mm

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 RD923-35SL rim is 569mm+3mm*2=575mm


A: Rim nipple bed thickness (=3mm)

B: Length of nipple cap (2.5mm~3mm generally)

TECHNOLOGY
Carbon Fiber Material

Carbon Fiber Material

Premium T700 + T800 grade carbon fiber are used in our carbon rims. 

Combining with stable resin system to make consistent quality and light weight road bike carbon rims.

Light Weight

Light Weight

By using well designed lay-up structure, mixing T700 and T800 grade carbon prepreg, light weight carbon rims are created.

Excessive materials are eliminated to save weight, while extra materials are added around spoke hole for reinforcement.

So, light weight is achieved without compromise in strength or stiffness.

Wider Inner Width

Wider Inner Width

Wider 23.5mm inner width, optimized for increasingly popular 700x30C-35C tires (also fit even wider tires).

Wider stance for tire, easy tire mounting and dismounting.

Better traction and cornering performance.

Aero U Shape

Aero U Shape

Wide U Shape carbon road rims are more aerodynamic than traditional V Shape road bike carbon rims. 

It is also of better stiffness and strength. 

Bead Lock

Bead Lock

There are small ridges on both side of rim channel called “bead lock”, which makes it easy for tubeless tire inflation.

Together with hooked bead to well lock the tire, prevent it from blowing out.

Tubeless Ready

Tubeless Ready

Tubeless tire is getting popular in road bike carbon wheels thanks to its better traction, lower rolling resistance and better riding comfort.

All our carbon clincher rims are tubeless ready (also fit normal tube tires).

Optimized anti-burp bump design provides easy tire mounting, dismounting, as well as air inflation. 

Road Disc Brake

Road Disc Brake

Road disc brake provides more sensitive and precise braking performance than rim brake.

Carbon fiber road bike rims designed specifically for disc brake use, no brake track. No “burning rim” worries during braking.

Specific carbon prepreg lay-up design for disc brake rims, longer durability and lighter weight.

2-Year Warranty

2-Year Warranty

We have strict production management system, QC and Testing process. Our quality is always very good and reliable.

For all carbon rims and carbon wheels sold by ProX, 2 years’ quality warranty is offered (starting from the date of package being signed).

Click Warranty Policy to see more details in another page.

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