{"product_id":"29er-hookless-carbon-mtb-rim-23mm-profile-28mm-inner-width-tubeless-ready-300-375g","title":"29er Hookless Carbon MTB Rim – 23mm Profile, 28mm Inner Width, Tubeless Ready, 300–375g","description":"\u003ch2\u003e29er Hookless Carbon MTB Rim — 23mm Profile | 28mm Inner Width | Tubeless Ready\u003c\/h2\u003e\u003cp\u003eThe Bola MTB34-C23-29 is a hookless, tubeless-compatible carbon fiber rim engineered for 29-inch cross-country and trail mountain bikes. At 300–375g per rim depending on layup grade, it offers a verified weight advantage over comparable alloy rims (typically 450–550g) while maintaining structural integrity for riders up to 100kg.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eRim Diameter\u003c\/td\u003e\n\u003ctd\u003e29er (ISO 622mm BSD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRim Profile Height\u003c\/td\u003e\n\u003ctd\u003e23mm (low-profile XC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Width\u003c\/td\u003e\n\u003ctd\u003e28mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Width\u003c\/td\u003e\n\u003ctd\u003e34mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eERD (Effective Rim Diameter)\u003c\/td\u003e\n\u003ctd\u003e592mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRim Shape\u003c\/td\u003e\n\u003ctd\u003eU-shape hookless\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight — Standard\u003c\/td\u003e\n\u003ctd\u003e375 ± 15g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight — Superlight\u003c\/td\u003e\n\u003ctd\u003e330 ± 10g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight — Ultralight\u003c\/td\u003e\n\u003ctd\u003e300 ± 10g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTire Pressure Range\u003c\/td\u003e\n\u003ctd\u003e45–65 psi (hookless limit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Rider Weight\u003c\/td\u003e\n\u003ctd\u003e100kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpoke Hole Diameter\u003c\/td\u003e\n\u003ctd\u003e4.5mm (customizable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Hole Diameter\u003c\/td\u003e\n\u003ctd\u003e6.5mm (customizable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAssembly Hole Diameter\u003c\/td\u003e\n\u003ctd\u003e7.5mm (customizable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNipple Direction\u003c\/td\u003e\n\u003ctd\u003eLeft 5° \/ Right 7° (customizable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eStructural Strength Data\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eForward Compressive Strength:\u003c\/strong\u003e \u0026gt;300kg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLateral Torsion Resistance:\u003c\/strong\u003e \u0026gt;50kg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpoke Hole Tension:\u003c\/strong\u003e \u0026gt;280kg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDynamic Equilibrium (imbalance):\u003c\/strong\u003e \u0026lt;3g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlatness Tolerance:\u003c\/strong\u003e \u0026lt;0.15mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoundness Tolerance:\u003c\/strong\u003e \u0026lt;0.3mm\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eHookless Design — What It Means for Your Build\u003c\/h2\u003e\u003cp\u003eHookless rims omit the traditional bead hook, reducing rim wall mass and enabling a more uniform carbon layup. This design is compatible with tubeless-ready tires that meet ETRTO hookless standards. \u003cstrong\u003eImportant:\u003c\/strong\u003e hookless rims require tubeless-specific tires and are limited to a maximum tire pressure of 65 psi. Clincher tires with inner tubes are not recommended on this rim.\u003c\/p\u003e\u003ch2\u003eCompatible Tire Widths\u003c\/h2\u003e\u003cp\u003eThe 28mm inner width is optimized for 2.1–2.4 inch (53–61mm) XC and trail tires. This width improves tire casing support, reduces pinch flat risk, and promotes a rounder tire profile for better cornering traction on hardpack and loose terrain.\u003c\/p\u003e\u003ch2\u003eWeight Grade Options\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard (375 ± 15g):\u003c\/strong\u003e Best for trail and endurance riders prioritizing durability over minimum weight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperlight (330 ± 10g):\u003c\/strong\u003e Balanced option for competitive XC riders seeking rotational weight savings without maximum layup risk.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltralight (300 ± 10g):\u003c\/strong\u003e Race-optimized layup for sub-100kg XC racers on groomed or low-impact terrain. Reduced impact tolerance compared to standard grade.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eKnown Tradeoffs\u003c\/h2\u003e\u003cp\u003eWhile the hookless construction saves weight and simplifies layup consistency, it caps maximum tire pressure at 65 psi and requires ETRTO-compliant tubeless tires. Riders requiring pressures above 65 psi or using clincher tires should select a hooked-bead carbon rim instead.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cdl\u003e\n\u003cdt\u003e\u003cstrong\u003eQ: How light should a carbon 29er rim be for competitive XC racing?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eA: Most competitive XC rims weigh between 280–360g. This rim's ultralight grade at 300 ± 10g sits within that range, while the superlight grade (330g) offers a more durable race option.\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eQ: Is a 28mm inner width good for tubeless mountain bike tires?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eA: Yes. ETRTO and most tire manufacturers recommend 25–30mm inner width for 2.1–2.4 inch MTB tires. At 28mm, this rim is well-positioned for XC and light trail use.\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eQ: What is the difference between hookless and hooked carbon rims?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eA: Hooked rims have a retaining bead that supports higher pressure and is compatible with standard clincher tires. Hookless rims require tubeless-ready tires, limit pressure to 65 psi, and achieve slightly lower rim weight through a cleaner carbon layup.\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eQ: Are hookless carbon rims safe for aggressive trail riding?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eA: This rim is rated for riders up to 100kg and supports compressive loads exceeding 300kg. It is suitable for XC and light trail use. For aggressive enduro or downhill terrain with high-impact forces, a taller-profile, heavier-layup rim is recommended.\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eQ: Can spoke count and hole diameter be customized?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eA: Yes. Spoke hole diameter (standard 4.5mm), valve hole diameter (6.5mm), assembly hole (7.5mm), and nipple offset angles are all available in custom configurations. Contact the manufacturer with your build specification.\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\/\",\n  \"@type\": \"Product\",\n  \"name\": \"Offset 29 inch extralight MTB tubeless hookless carbon bicicleta rim 23mm low profile 28mm inner wide for cross-country or mountain riding Bola\",\n  \"description\": \"29er Hookless Carbon MTB Rim — 23mm Profile | 28mm Inner Width | Tubeless Ready The Bola MTB34-C23-29 is a hookless, tubeless-compatible carbon fiber rim engineered for 29-inch cross-country and trail mountain bikes. At 300–375g per rim depending on layup grade, it offers a verified weight advantage over comparable alloy rims (typically 450–550g) while maintaining structural integrity for riders up to 100kg. Key Specifications Specification Value Rim Diameter 29er (ISO 622mm BSD) Rim Profile Height 23mm (low-profile XC) Inner Width 28mm Outer Width 34mm ERD (Effective Rim Diameter) 592mm Rim Shape U-shape hookless Weight — Standard 375 ± 15g Weight — Superlight 330 ± 10g Weight — Ultralight 300 ± 10g Tire Pressure Range 45–65 psi (hookless limit) Max Rider Weight 100kg Spoke Hole Diameter 4.5mm (customizable) Valve Hole Diameter 6.5mm (customizable) Assembly Hole Diameter 7.5mm (customizable) Nipple Direction Left 5° \/ Right 7° (customizable) Structural Strength Data Forward Compressive Strength: \u0026gt;300kg Lateral Torsion Resistance: \u0026gt;50kg Spoke Hole Tension: \u0026gt;280kg Dynamic Equilibrium (imbalance): \u0026lt;3g Flatness Tolerance: \u0026lt;0.15mm Roundness Tolerance: \u0026lt;0.3mm Hookless Design — What It Means for Your Build Hookless rims omit the traditional bead hook, reducing rim wall mass and enabling a more uniform carbon layup. This design is compatible with tubeless-ready tires that meet ETRTO hookless standards. Important: hookless rims require tubeless-specific tires and are limited to a maximum tire pressure of 65 psi. Clincher tires with inner tubes are not recommended on this rim. Compatible Tire Widths The 28mm inner width is optimized for 2.1–2.4 inch (53–61mm) XC and trail tires. This width improves tire casing support, reduces pinch flat risk, and promotes a rounder tire profile for better cornering traction on hardpack and loose terrain. Weight Grade Options Standard (375 ± 15g): Best for trail and endurance riders prioritizing durability over minimum weight. Superlight (330 ± 10g): Balanced option for competitive XC riders seeking rotational weight savings without maximum layup risk. Ultralight (300 ± 10g): Race-optimized layup for sub-100kg XC racers on groomed or low-impact terrain. Reduced impact tolerance compared to standard grade. Known Tradeoffs While the hookless construction saves weight and simplifies layup consistency, it caps maximum tire pressure at 65 psi and requires ETRTO-compliant tubeless tires. Riders requiring pressures above 65 psi or using clincher tires should select a hooked-bead carbon rim instead. Frequently Asked Questions Q: How light should a carbon 29er rim be for competitive XC racing? A: Most competitive XC rims weigh between 280–360g. This rim's ultralight grade at 300 ± 10g sits within that range, while the superlight grade (330g) offers a more durable race option. Q: Is a 28mm inner width good for tubeless mountain bike tires? A: Yes. ETRTO and most tire manufacturers recommend 25–30mm inner width for 2.1–2.4 inch MTB tires. At 28mm, this rim is well-positioned for XC and light trail use. Q: What is the difference between hookless and hooked carbon rims? A: Hooked rims have a retaining bead that supports higher pressure and is compatible with standard clincher tires. Hookless rims require tubeless-ready tires, limit pressure to 65 psi, and achieve slightly lower rim weight through a cleaner carbon layup. Q: Are hookless carbon rims safe for aggressive trail riding? A: This rim is rated for riders up to 100kg and supports compressive loads exceeding 300kg. It is suitable for XC and light trail use. For aggressive enduro or downhill terrain with high-impact forces, a taller-profile, heavier-layup rim is recommended. Q: Can spoke count and hole diameter be customized? A: Yes. Spoke hole diameter (standard 4.5mm), valve hole diameter (6.5mm), assembly hole (7.5mm), and nipple offset angles are all available in custom configurations. 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