# 40mm Carbon Road Rim, 36mm Outer, 30mm Inner, Tubeless Ready, 700C, Ultralight 365–445g ## Explore the Benefits of the 40mm Carbon Road Rim Tubeless A high-performance, tubeless-ready carbon road rim engineered for competitive racing, endurance cycling, and custom wheelset builds. The 30mm inner width accommodates tire widths from 25c to 50c, making it equally capable on fast road courses and mixed-surface endurance routes. Available in four verified weight tiers—from a standard 445g to an extreme-light 365g—so teams and brands can match rim specification precisely to rider demands. ## Key Specifications Specification Value Rim Size 700C Rim Profile UV Shape (hooked tubeless-compatible) Rim Height 40mm Outer Width 36mm Inner Width 30mm ERD 558mm Valve Hole Diameter 6.5mm (customizable) Spoke Hole Diameter 4.5mm (customizable) Nipple Direction (Front) 7° Nipple Direction (Rear) 5° & 7° (customizable) Min / Max Tire Pressure 100 / 125 psi Max Rider Weight 120 kg ## Weight Tiers Scheme Weight per Rim Standard 445 ± 15g Superlight 410 ± 10g Ultralight 385 ± 10g Extreme Light 365 ± 10g _Note: Lighter weight tiers use reduced laminate schedules. For riders above 90 kg or high-torque sprint applications, the Standard or Superlight tier is recommended for optimal fatigue resistance._ ## Structural Performance Data - **Forward Compressive Strength:** >300 kg - **Lateral Torsion Resistance:** >50 kg - **Spoke Hole Tension:** >280 kg - **Dynamic Equilibrium:** <3g imbalance - **Flatness Tolerance:** <0.15mm - **Roundness Tolerance:** <0.3mm ## Compatibility & Customization - **Tire Compatibility:** Tubeless and clincher tires, 25c–50c recommended range - **Frame Compatibility:** Fits standard 700C road, endurance, and gravel frames with minimum 40mm rim clearance - **Hook Type:** Hooked UV profile — compatible with standard road tubeless tires (not hookless-only tires) - **Drill Options:** Assembly hole, valve hole, and spoke hole diameters available in custom sizes on request - **Custom Branding:** OEM/private label available for cycling brands and professional teams ## Frequently Asked Questions **Is a 30mm inner width carbon rim suitable for endurance road and gravel cycling?** Yes. A 30mm internal width supports tire widths from 28c to 45c at optimal inflation volume, reducing rolling resistance and improving compliance on rough surfaces — well-suited to endurance road and light gravel use. **Are 36mm wide carbon rims compatible with standard road bike frames?** Most modern road and endurance frames with 40mm+ rim clearance accommodate a 36mm outer-width rim without contact. Always verify your frame's stated maximum tire/rim clearance before ordering. **What is the weight of an ultralight carbon road rim at this spec?** The Ultralight tier of this rim weighs 385 ± 10g per rim. The Extreme Light option reaches 365 ± 10g. Both are achieved through selective carbon layup reduction; the Standard 445g tier is recommended for heavier riders or frequent training use. **What makes this rim suitable for tubeless setup?** The UV hooked bead profile seals tubeless tires securely within the 100–125 psi pressure range. The 6.5mm valve hole accommodates standard tubeless valves, and the rim bed geometry supports tubeless tape installation. **Can I order custom hole diameters or nipple angles?** Yes. Assembly hole, valve hole, and spoke hole diameters are customizable. Nipple direction options beyond the standard 7° front / 5°–7° rear are available on request for OEM and team orders. ### Lightweight and Durable Design The 40mm carbon road rim tubeless combines an ultralight frame weighing between 365 and 445 grams with impressive durability, designed to enhance your cycling experience. Its advanced carbon construction offers remarkable strength while maintaining the featherlight weight crucial for competitive and recreational cyclists. The balance of a 36mm outer width and 30mm inner width provides optimal profile for speed and control on the road, allowing riders to accelerate efficiently without sacrificing stability during long rides or aggressive cornering. ### Tubeless Ready for Enhanced Performance Designed specifically as a tubeless ready rim, this 40mm carbon road rim tubeless eliminates the need for traditional inner tubes, reducing rolling resistance and minimizing the risk of punctures. This tubeless compatibility not only results in a smoother ride but also allows cyclists to run lower tire pressures, increasing comfort and traction on various road surfaces. The rim’s precision engineering ensures an airtight seal, making setup straightforward and maintenance hassle-free, ideal for riders who demand reliability during endurance rides or races. ### Perfect Fit for 700C Road Bikes Optimized for 700C road bike configurations, this 40mm carbon road rim tubeless strikes the right balance between width and aerodynamic efficiency. The rim’s dimensions are compatible with a wide range of tire sizes, enabling cyclists to customize their wheel setup based on riding conditions or personal preference. Its wide rim profile supports larger volume tires, improving grip and shock absorption without adding unnecessary drag. Whether upgrading existing wheels or building a new set, this rim delivers exceptional performance tailored to road cycling needs. ## Details - **Price:** 310.0 USD - 340.0 USD - **Type:** Carbon Road Bike Rim - **Tags:** 36mm wide, 40mm carbon road rim, 700c, 700C carbon rim, carbon bike rim, carbon wheel building, endurance cycling rim, gravel compatible rim, lightweight carbon rim, performance road rim, rims, tubeless ready rim, tubeless road rim, ultralight bike rim, ultralight road rim, wide road 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 / 20/20 / Extremelight | 340.00 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 / 24/24 / Extremelight | 340.00 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 Matt / Customs / Extremelight | 340.00 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 / 20/20 / Extremelight | 340.00 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 / 24/24 / Extremelight | 340.00 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 | | UD Glossy / Customs / Extremelight | 340.00 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 / 20/20 / Extremelight | 340.00 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 / 24/24 / Extremelight | 340.00 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 Matt / Customs / Extremelight | 340.00 USD | In stock | | Marble Glossy / 20/20 / Standard | 330.00 USD | In stock | | Marble Glossy / 20/20 / Superlight | 330.00 USD | In stock | | Marble Glossy / 20/20 / Ultralight | 330.00 USD | In stock | | Marble Glossy / 20/20 / Extremelight | 330.00 USD | In stock | | Marble Glossy / 24/24 / Standard | 330.00 USD | In stock | | Marble Glossy / 24/24 / Superlight | 330.00 USD | In stock | | Marble Glossy / 24/24 / Ultralight | 330.00 USD | In stock | | Marble Glossy / 24/24 / Extremelight | 330.00 USD | In stock | | Marble Glossy / Customs / Standard | 330.00 USD | In stock | | Marble Glossy / Customs / Superlight | 330.00 USD | In stock | | Marble Glossy / Customs / Ultralight | 330.00 USD | In stock | | Marble Glossy / Customs / Extremelight | 330.00 USD | In stock | ## Images - 40mm Carbon Road Rim set, 36mm outer and 30mm inner width, tubeless ready, ultralight design, 700C size. - 700C 40mm carbon tubeless rim cross-section showing 30mm inner width and spoke hole detail - Bola 700c 45mm Carbon Road Rim – 34mm Outer, 28mm Inner, Tubeless Ready - 40mm Carbon Road Rim – 36mm Outer / 30mm Inner Width, Tubeless Ready, 700C, Ultralight (365–445g) Carbon Fiber Sporting Goods - 40mm Carbon Road Rim – 36mm Outer / 30mm Inner Width, Tubeless Ready, 700C, Ultralight (365–445g) Carbon Fiber Sporting Goods ## Additional Information - **Related products settings:** ahead - **AI Summary:** The 40mm Carbon Road Rim is a 700C carbon rim for riders and wheel builders creating tubeless road, endurance, and mixed-surface wheelsets. Its 30mm internal width supports 25c to 50c tires, while four verified weight tiers let racers, training riders, and OEM builders choose a layup suited to their intended use. --- > Source: [Bola Carbon Wheelset ](https://bolacarbon.com/products/40mm-carbon-road-rim-36mm-outer-30mm-inner-width-tubeless-ready-700c-ultralight-365-445g) > Updated: 2026-07-31