# Bola 700c Carbon Road Rim 25mm Inner Width for Disc Brake, 40mm or 45mm Depth, 24 Spoke UV Profile ## Premium 700c Carbon Road Rim Disc Brake for High-Performance Cycling The Bola 700c carbon road rim delivers race-ready aerodynamics and ultralight construction in a wide-profile, disc-brake-compatible design. Available in 40mm and 45mm depths, with a 25mm inner width optimized for 28–32mm tires, it is suited for competitive road racing, endurance cycling, and premium custom wheelset builds. ## Key Specifications Specification 40mm Variant 45mm Variant Rim Height 40mm 45mm Outer Width 34mm 31mm Inner Width 25mm 25mm ERD 549mm 549mm Spoke Count 24H 24H Brake Type Disc Brake Disc Brake Valve Hole Diameter 6.5mm (customizable) 6.5mm (customizable) Spoke Hole Diameter 4.5mm (customizable) 4.5mm (customizable) Assembly Hole Diameter 7.5mm (customizable) 7.5mm (customizable) Nipple Direction (Front) 7° 7° Nipple Direction (Rear) 5° & 7° (customizable) 5° & 7° (customizable) Tire Pressure Range 100–125 psi 100–125 psi Max Rider Weight 120 kg 120 kg ## Weight Options Grade Weight per Rim Standard 450 ± 15g Superlight 420 ± 10g Ultralight 395 ± 10g Extreme Light 375 ± 10g ## 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 ## Why Choose the Bola UV Profile Rim? - **Wide Inner Profile:** The 25mm inner width accommodates modern 28–32mm road and gravel tires, improving air volume, rolling resistance, and rider comfort compared to traditional 19–21mm inner-width rims. - **Dual Depth Availability:** The 40mm depth offers a balanced all-round ride with lower crosswind sensitivity; the 45mm depth increases aerodynamic efficiency for flat and rolling terrain at the cost of marginally higher wind sensitivity. - **Lightweight Construction:** The Extreme Light grade at 375 ± 10g per rim is competitive for race-category carbon rims in this depth class. Note: lighter grades involve tighter layup tolerances and are recommended for riders under 80 kg and race-day use. - **OEM & Custom-Build Ready:** Hole diameters, nipple angles, and spoke counts are customizable for brand-label and team-order builds. Minimum order quantities available on request. - **Disc Brake Optimized:** Braking track is not present; the rim is designed exclusively for disc brake drivetrains, eliminating heat stress at the braking surface common in rim-brake carbon rims. ## Tradeoffs to Consider - The 24-spoke lacing pattern reduces weight but requires precise tensioning during build. It is not recommended for riders above 100 kg without upgrading to the Standard weight grade. - The 45mm depth increases aerodynamic drag sensitivity in crosswinds above approximately 30 km/h lateral component; the 40mm depth is the more versatile option for mixed-terrain endurance use. - Extreme Light grade rims are optimized for race-day performance and may exhibit reduced fatigue life under high-frequency cobblestone or gravel loads compared to the Standard grade. ## Frequently Asked Questions **What is the best rim depth for endurance road cycling — 40mm or 45mm?** For endurance cycling involving variable terrain and wind exposure, the 40mm depth is recommended. It offers a better crosswind stability profile while still delivering aerodynamic advantage over sub-35mm rims. The 45mm depth is better suited to flat road racing or time-trial segments where wind conditions are controlled. **Is a 25mm inner wide carbon rim better for endurance or race cycling?** A 25mm inner width supports a wider range of tire volumes (28–32mm road tires) than traditional 19–21mm rims, making it well-suited for both endurance and race applications. For race use, pairing with a 28mm tire at 90–100 psi reduces rolling resistance. For endurance, a 30–32mm tire at 80–90 psi improves comfort and traction. **Are 24-spoke carbon rims strong enough for everyday road cycling?** Yes, for riders under 100 kg riding on paved surfaces. The spoke hole tension rating of >280 kg per hole and forward compressive strength of >300 kg ensure structural integrity under typical road loads. For heavier riders or frequent rough-road use, the Standard weight grade (450 ± 15g) is recommended over the Extreme Light variant. **What tire pressure should I use with this rim?** The rated tire pressure range is 100–125 psi. For optimal performance with 28mm tires, 95–110 psi is typical for road racing. Exceeding 125 psi risks bead seat stress and is not recommended. **Can I order custom spoke hole counts or branding for OEM builds?** Yes. Spoke hole diameter, valve hole diameter, assembly hole diameter, and nipple angles are all customizable. OEM branding and custom spoke counts are available for small to medium cycling brand orders. Contact us with build specifications for a quote. **What warranty does the Bola carbon rim carry?** Bola carbon rims are backed by a three-year manufacturer warranty covering structural defects under normal use conditions. ### Wide 25mm Inner Width for Enhanced Stability and Control The 700c carbon road rim disc brake from Bola features a 25mm inner width designed to improve tire fit and stability. This wider rim enhances tire shape, providing a larger contact patch with the road, which translates to better grip and control during rides. Perfect for riders who prioritize handling, the improved tire support reduces the risk of pinch flats and enhances cornering confidence. This rim width is ideal for modern road tires, balancing aerodynamics and comfort without compromising speed or responsiveness. ### Optimized 40mm & 45mm Depth for Aerodynamics and Versatility Offered in 40mm and 45mm depth options, these Bola carbon rims are perfectly optimized for aerodynamic efficiency and versatility. The mid-profile rim depths reduce drag and improve speed on flat terrain while maintaining enough profile to ensure manageable crosswind performance. These depths make the rim suitable for various riding styles, from fast group rides to long endurance sessions. Lightweight and stiff, the design balances aerodynamic performance with practical usability on diverse road conditions. ### Durable 24-Spoke UV Profile Designed for Disc Brake Systems Built specifically for disc brake setups, the 24-spoke design and UV aerodynamic profile of this rim ensure outstanding durability and effective braking performance. The spoke count enhances wheel strength without adding unnecessary weight, contributing to solid power transfer and reliable wheel integrity. Additionally, the UV profile optimizes airflow interaction around the spokes, reducing turbulence and enhancing overall aerodynamic efficiency. This rim is perfectly matched to modern disc brakes, providing crisp stopping power and consistent performance in all weather conditions. ## Details - **Price:** 310.0 USD - 340.0 USD - **Type:** Carbon Bicycle Rim - **Tags:** 25mm inner wide rim, 25mm inner width rim, 34mm wide, 40mm 45mm carbon rim, 700c, 700c carbon road rim, 700c disc brake rim, aero road rim, carbon rim for 28mm tires, carbon road bike rim, carbon road rim, custom wheel build rim, disc brake rim, lightweight bike rim, rims, wide road rim ## Variants | Variant | Price | Available | |---------|-------|-----------| | UD Matt / Standard | 310.00 USD | In stock | | UD Matt / Superlight | 320.00 USD | In stock | | UD Matt / Ultralight | 330.00 USD | In stock | | UD Matt / Extremelight | 340.00 USD | In stock | | UD Glossy / Standard | 310.00 USD | In stock | | UD Glossy / Superlight | 320.00 USD | In stock | | UD Glossy / Ultralight | 330.00 USD | In stock | | UD Glossy / Extremelight | 340.00 USD | In stock | | Marble Matt / Standard | 310.00 USD | In stock | | Marble Matt / Superlight | 320.00 USD | In stock | | Marble Matt / Ultralight | 330.00 USD | In stock | | Marble Matt / Extremelight | 340.00 USD | In stock | | Marble Glossy / Standard | 310.00 USD | In stock | | Marble Glossy / Superlight | 320.00 USD | In stock | | Marble Glossy / Ultralight | 330.00 USD | In stock | | Marble Glossy / Extremelight | 340.00 USD | In stock | ## Images - 700c 25mm Inner Wide Carbon Road Rim set with 40mm and 45mm depth, featuring a disc brake design and 24 spokes. - Bola 700c carbon gravel rim – UV wave profile cross-section showing 34mm external width - 700c 25mm Inner Wide Carbon Road Rim with 40mm & 45mm depth, disc brake, 24-spoke, UV profile specifications. - 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 25mm Inner Wide Carbon Road Rim | 40mm & 45mm Depth | Disc Brake | 24-Spoke | UV Profile – Bola Carbon Fiber Sporting Goods - 700c 25mm Inner Wide Carbon Road Rim | 40mm & 45mm Depth | Disc Brake | 24-Spoke | UV Profile – Bola Carbon Fiber Sporting Goods ## Additional Information - **Related products settings:** ahead - **AI Summary:** The Bola 700c 25mm Inner Wide Carbon Road Rim is a carbon, disc-brake-only rim for riders and wheel builders creating lightweight road wheelsets for racing, endurance riding, and custom builds. Its 40mm and 45mm UV-profile options let riders choose a more versatile or more aerodynamic setup based on their route and wind exposure. --- > Source: [Bola Carbon Wheelset ](https://bolacarbon.com/products/700c-25mm-inner-wide-carbon-road-rim-40mm-45mm-depth-disc-brake-24-spoke-uv-profile-bola) > Updated: 2026-07-31