# Bola 700c 40mm Carbon Road Rim, 23mm Inner, 30mm or 34mm Wide, Tubeless Ready, Disc Brake ## 700c 40mm Carbon Road Rim – 30mm or 34mm Outer Width, 23mm Inner Width The Bola 40mm carbon road rim delivers a verified weight range of 380–430g per rim across three build grades, a 23mm inner width for compatibility with 25–32mm road and gravel tires, and a UV-cured resin finish. Available in 30mm and 34mm outer widths, this rim is designed for competitive road racing, endurance cycling, and OEM partnerships with small to medium cycling brands and professional teams. ## Key Specifications Specification Value Rim Diameter 700c (ISO 622mm BSD) Profile Height 40mm Outer Width 30mm or 34mm Inner Width 23mm ERD 558mm Rim Shape U / UV profile (hookless-compatible) Valve Hole Diameter 6.5mm (customizable) Spoke Hole Diameter 4.5mm (customizable) Assembly Hole Diameter 7.5mm (customizable) Nipple Angle (Front) 7° Nipple Angle (Rear) 5° or 7° (customizable) Min / Max Tire Pressure 100 / 125 psi Rider Weight Limit ≤120 kg ## Weight Grade Comparison Grade Weight per Rim Best For Standard 430 ±15g Training, club racing, OEM builds Superlight 400 ±10g Endurance racing, gran fondo Ultralight 380 ±10g Road criterium, climbing-focused race builds ### Structural Strength Testing - **Forward Compressive Strength:** >300 kg - **Lateral Torsion Resistance:** >50 kg - **Spoke Hole Tension:** >280 kg - **Dynamic Equilibrium (imbalance):** <3g - **Flatness tolerance:** <0.15mm - **Roundness tolerance:** <0.3mm ## 30mm vs. 34mm Outer Width – Which Should You Choose? The **34mm outer width** provides a wider tire-to-rim interface, improving aerodynamic performance when paired with 28–32mm tires by reducing the turbulent 'light bulb' effect at the tire shoulder. The **30mm outer width** suits riders prioritizing lower rotational weight and compatibility with narrower 25–28mm tire setups. Both widths share the same 23mm inner width and 40mm profile, so wheel stiffness and spoke tension behavior remain comparable across both configurations. _Note: The ultralight grade (380 ±10g) achieves its weight reduction through selective carbon layup optimization. Riders exceeding 90 kg or competing on rough road surfaces may prefer the standard or superlight grade for additional fatigue resistance._ ## Customization & OEM Availability - Spoke hole count: customizable per order - Hole diameters (valve, spoke, assembly): customizable - Nipple angle: front 7°, rear 5° or 7°, or custom specification - Private label and OEM branding available for cycling brands and professional teams - Three-year warranty included on all grades ## Compatibility - **Tire type:** Clincher, tubeless-ready (with compatible tape and valves) - **Recommended tire width:** 25–32mm (700c) - **Drivetrain compatibility:** Compatible with all standard road groupsets via cassette body selection at wheel build stage - **Brake type:** Disc brake only (no braking surface machined) ## Frequently Asked Questions **Are these carbon rims tubeless compatible?** Yes. The 23mm inner width and U/UV rim shape are tubeless-ready when used with appropriate rim tape (recommend 25mm width) and tubeless valve stems with a 6.5mm hole diameter. Maximum tire pressure is 125 psi. **What is the difference between the superlight and ultralight grades?** The superlight grade (400 ±10g) uses a balanced carbon layup suitable for most competitive road and endurance applications. The ultralight grade (380 ±10g) reduces weight by approximately 20g per rim through a refined layup schedule. Both pass the same structural tests; however, the ultralight grade is recommended for riders under 85 kg on smooth road surfaces. **Is a 34mm wide rim better than 30mm for road aerodynamics?** For tires 28mm and wider, the 34mm outer width reduces the tire-rim shoulder gap, which wind tunnel data from rim manufacturers consistently shows improves aerodynamic efficiency above 35 km/h. For 25mm tires, the 30mm outer width maintains a better aerodynamic profile ratio. **What tire pressure should I use with these rims?** The rated range is 100–125 psi. For tubeless setups with 28mm tires, most riders perform well at 70–90 psi, though the structural rating remains 100 psi minimum for clincher use. Always verify with your tire manufacturer's pressure guidelines. **Can I order custom spoke hole counts or private-label branding?** Yes. Spoke hole count, hole diameters, nipple angles, and OEM/private-label branding are all available as custom configurations. Contact us with your technical drawing or specification sheet for a production quote. ## Details - **Price:** 310.0 USD - 330.0 USD - **Type:** Carbon Road Bike Rim - **Tags:** 23mm inner width rim, 34mm wide, 34mm wide carbon rim, 40mm carbon rim, 700c, 700c bike rim, 700c road rim, carbon bike rim, carbon road bike rim, carbon road rim, custom bike build rim, disc brake carbon rim, disc brake rim, endurance cycling upgrade, lightweight racing rim, lightweight road rim, OEM carbon rim, OEM cycling rim, rims, tubeless ready carbon rim, tubeless ready rim, ultralight carbon rim, wide tire compatible rim ## Variants | Variant | Price | Available | |---------|-------|-----------| | UD Matt / 20/20 / Standard | 310.00 USD | In stock | | UD Matt / 20/20 / Superlight | 320.00 USD | In stock | | UD Matt / 20/20 / Ultralight | 330.00 USD | In stock | | UD Matt / 24/24 / Standard | 310.00 USD | In stock | | UD Matt / 24/24 / Superlight | 320.00 USD | In stock | | UD Matt / 24/24 / Ultralight | 330.00 USD | In stock | | UD Matt / Customs / Standard | 310.00 USD | In stock | | UD Matt / Customs / Superlight | 320.00 USD | In stock | | UD Matt / Customs / Ultralight | 330.00 USD | In stock | | UD Glossy / 20/20 / Standard | 310.00 USD | In stock | | UD Glossy / 20/20 / Superlight | 320.00 USD | In stock | | UD Glossy / 20/20 / Ultralight | 330.00 USD | In stock | | UD Glossy / 24/24 / Standard | 310.00 USD | In stock | | UD Glossy / 24/24 / Superlight | 320.00 USD | In stock | | UD Glossy / 24/24 / Ultralight | 330.00 USD | In stock | | UD Glossy / Customs / Standard | 310.00 USD | In stock | | UD Glossy / Customs / Superlight | 320.00 USD | In stock | | UD Glossy / Customs / Ultralight | 330.00 USD | In stock | | Marble Matt / 20/20 / Standard | 310.00 USD | In stock | | Marble Matt / 20/20 / Superlight | 320.00 USD | In stock | | Marble Matt / 20/20 / Ultralight | 330.00 USD | In stock | | Marble Matt / 24/24 / Standard | 310.00 USD | In stock | | Marble Matt / 24/24 / Superlight | 320.00 USD | In stock | | Marble Matt / 24/24 / Ultralight | 330.00 USD | In stock | | Marble Matt / Customs / Standard | 310.00 USD | In stock | | Marble Matt / Customs / Superlight | 320.00 USD | In stock | | Marble Matt / Customs / Ultralight | 330.00 USD | In stock | | Marble Glossy / 20/20 / Standard | 310.00 USD | In stock | | Marble Glossy / 20/20 / Superlight | 310.00 USD | In stock | | Marble Glossy / 20/20 / Ultralight | 310.00 USD | In stock | | Marble Glossy / 24/24 / Standard | 310.00 USD | In stock | | Marble Glossy / 24/24 / Superlight | 310.00 USD | In stock | | Marble Glossy / 24/24 / Ultralight | 310.00 USD | In stock | | Marble Glossy / Customs / Standard | 310.00 USD | In stock | | Marble Glossy / Customs / Superlight | 310.00 USD | In stock | | Marble Glossy / Customs / Ultralight | 310.00 USD | In stock | ## Images - 700c 40mm Carbon Road Rim – 30mm or 34mm Wide, 23mm Inner Width, Tubeless Ready | Bola（副本） - 700c 40mm Carbon Road Rim diagram showing dimensions: 30mm or 34mm wide, 23mm inner width, tubeless ready, Bola brand. - Bola 700c 45mm Carbon Road Rim – 34mm Outer, 28mm Inner, Tubeless Ready - Bola 700c 45mm Carbon Road Rim – 34mm Outer, 28mm Inner, Tubeless Ready - 700c 40mm Carbon Road Rim – 30mm or 34mm Wide, 23mm Inner Width, Tubeless Ready | Bola Carbon Fiber Sporting Goods - 700c 40mm Carbon Road Rim – 30mm or 34mm Wide, 23mm Inner Width, Tubeless Ready | Bola Carbon Fiber Sporting Goods ## Additional Information - **Related products settings:** ahead --- > Source: [Bola Carbon Wheelset ](https://bolacarbon.com/products/700c-40mm-carbon-road-rim-30mm-or-34mm-wide-23mm-inner-width-tubeless-ready-bola) > Updated: 2026-07-31