Carbon Fiber Sporting Goods
18" Carbon Clincher Rim, 40mm Profile, 18mm Inner – U-Shape for Low Rider Bikes
18" Carbon Clincher Rim, 40mm Profile, 18mm Inner – U-Shape for Low Rider Bikes
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18 Inch Clincher Carbon Rim – 40mm Profile | U-Shape | 18mm Inner Width
This 18-inch clincher carbon fiber bicycle rim is purpose-built for low rider bikes, small-wheel custom builds, and specialty cycling applications requiring a compact, high-stiffness hoop. With a 40mm aerodynamic profile and an 18mm inner width, it delivers a stable tire seating bed optimized for tire widths in the 23–32mm range at 45–65 psi.
Key Specifications
- Rim Diameter: 18 inch (355mm BSD)
- Rim Shape: U-shape clincher
- Profile Height: 40mm
- Outer Width: 25mm
- Inner Width: 18mm
- ERD (Effective Rim Diameter): 294mm
- Weight: 320 g ± 15 g per rim
- Min / Max Tire Pressure: 45 / 65 psi
- Max Rider Weight: 100 kg
Structural Strength Data
| Test Parameter | Result |
|---|---|
| Forward Compressive Strength | > 300 kg |
| Lateral Torsion Resistance | > 50 kg |
| Spoke Hole Tension | > 280 kg |
| Dynamic Equilibrium (imbalance) | < 3 g |
| Flatness Tolerance | < 0.15 mm |
| Roundness Tolerance | < 0.3 mm |
Drilling & Valve Specifications
- Assembly Hole Diameter: 7.5 mm (customizable)
- Valve Hole Diameter: 6.5 mm (customizable)
- Spoke Hole Diameter: 4.5 mm (customizable)
- Nipple Direction: Left 5°, Right 7° (customizable)
Who This Rim Is For
This rim is specifically designed for builders and cyclists working with 18-inch wheel formats — a niche commonly found in low rider bicycles, folding bikes, and compact urban custom builds. The 40mm carbon profile provides aerodynamic benefit and lateral stiffness without the weight penalty of deeper-section alloy alternatives. At 320 g, it is a competitive weight class for this wheel size.
Note: Maximum rider weight is rated at 100 kg. This rim is not intended for off-road or trail applications. Tire pressure must remain within the 45–65 psi range to ensure structural integrity.
Customization & OEM Options
Hole diameters, spoke counts, nipple angles, and branding (decals, paint finish) are available for small-to-medium cycling brands and professional teams. Backed by a 3-year manufacturer warranty and over a decade of carbon rim production experience supplying brands across Europe and North America.
Frequently Asked Questions
- Is a 40mm carbon profile suitable for an 18-inch low rider build?
- Yes. The 40mm U-shape profile on an 18-inch rim provides proportionate aerodynamic depth and lateral stiffness for low rider and specialty small-wheel applications without adding excessive rotational mass.
- What tire width is compatible with an 18mm inner width rim?
- An 18mm inner width is optimized for clincher tires in the 23–32mm range. Wider tires may exceed the 65 psi pressure ceiling and are not recommended on this rim.
- Can I order custom spoke hole counts or valve hole sizes?
- Yes. Assembly hole diameter (default 7.5 mm), valve hole diameter (default 6.5 mm), and spoke hole diameter (default 4.5 mm) are all available in custom specifications. Contact us with your build requirements.
- What is the weight of this carbon rim?
- The rim weighs 320 g ± 15 g per piece, making it a lightweight choice for an 18-inch carbon clincher in this profile category.
- Are carbon rims worth using on a low rider or custom small-wheel bike?
- Carbon fiber offers a better stiffness-to-weight ratio than alloy at equivalent rim depths. For a specialty 18-inch build where aesthetics, stiffness, and low rotational weight matter, this rim is a technically sound upgrade over standard alloy options. The tradeoff is a narrower tire pressure window (45–65 psi) and a 100 kg rider weight ceiling.
