{"product_id":"asymmetric-carbon-29er-mtb-rim-23mm-high-30mm-inner-width-300-380g-xc-all-mountain","title":"Asymmetric Carbon 29er MTB Rim – 23mm High, 30mm Inner Width, 300–380g (XC \/ All-Mountain)","description":"\u003ch2\u003eAsymmetric Carbon 29er MTB Rim — 23mm High \/ 30mm Inner Width\u003c\/h2\u003e\u003cp\u003eThis hooked asymmetric carbon rim is designed for 29-inch mountain bike wheels used in cross-country (XC) racing and all-mountain (AM) riding. The 30mm inner width supports modern high-volume tyres (2.2–2.6 in) at pressures between 45 and 65 psi, while the 23mm profile keeps rotational weight low without sacrificing lateral stiffness. Available in three weight tiers: \u003cstrong\u003eStandard (380 ± 15 g)\u003c\/strong\u003e, \u003cstrong\u003eSuperlight (330 ± 10 g)\u003c\/strong\u003e, and \u003cstrong\u003eUltralight (300 ± 10 g)\u003c\/strong\u003e per rim.\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\u003eWheel Size\u003c\/td\u003e\n\u003ctd\u003e29er (700c compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRim Shape\u003c\/td\u003e\n\u003ctd\u003eU-shape (hooked)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRim Height\u003c\/td\u003e\n\u003ctd\u003e23 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Width\u003c\/td\u003e\n\u003ctd\u003e36 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Width\u003c\/td\u003e\n\u003ctd\u003e30 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eERD (Effective Rim Diameter)\u003c\/td\u003e\n\u003ctd\u003e592 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight – Standard\u003c\/td\u003e\n\u003ctd\u003e380 ± 15 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight – Superlight\u003c\/td\u003e\n\u003ctd\u003e330 ± 10 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight – Ultralight\u003c\/td\u003e\n\u003ctd\u003e300 ± 10 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eForward Compressive Strength\u003c\/td\u003e\n\u003ctd\u003e\u0026gt; 300 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLateral Torsion Resistance\u003c\/td\u003e\n\u003ctd\u003e\u0026gt; 50 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpoke Hole Tension\u003c\/td\u003e\n\u003ctd\u003e\u0026gt; 280 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDynamic Imbalance\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 3 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlatness Tolerance\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 0.15 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoundness Tolerance\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 0.3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Hole Diameter\u003c\/td\u003e\n\u003ctd\u003e6.5 mm (customisable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpoke Hole Diameter\u003c\/td\u003e\n\u003ctd\u003e4.5 mm (customisable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAssembly Hole Diameter\u003c\/td\u003e\n\u003ctd\u003e7.5 mm (customisable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNipple Angle\u003c\/td\u003e\n\u003ctd\u003eLeft 5° \/ Right 7° (asymmetric offset; customisable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMin \/ Max Tyre Pressure\u003c\/td\u003e\n\u003ctd\u003e45 \/ 65 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Rider Weight\u003c\/td\u003e\n\u003ctd\u003e100 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eDesign Tradeoffs to Know Before You Buy\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e23mm rim height vs. deeper profiles:\u003c\/strong\u003e A shallower 23mm section reduces aerodynamic drag penalty in technical terrain and saves 30–60 g versus 30–35mm profiles. It is not optimised for road-style speed riding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30mm inner width:\u003c\/strong\u003e Supports tyres from approximately 2.2 to 2.6 in. Riders using tyres narrower than 2.1 in may experience reduced tyre-sidewall support.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAsymmetric offset (left 5° \/ right 7°):\u003c\/strong\u003e Corrects spoke-tension imbalance on rear wheels driven by cassette offset, improving wheel trueness and fatigue life. Requires asymmetric-aware wheel building.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHooked bead (U-shape):\u003c\/strong\u003e Compatible with both clincher and tubeless-ready tyres. Not a hookless rim — standard clincher and tubeless tyres are fully supported.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100 kg rider weight limit:\u003c\/strong\u003e Suits XC and trail riders. Heavier enduro or downhill riders should consider a higher-volume, reinforced rim model.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatible Riding Styles\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross-Country (XC) Racing:\u003c\/strong\u003e Ultralight tier (300 ± 10 g) delivers competitive weight savings for race-day builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrail \u0026amp; All-Mountain (AM):\u003c\/strong\u003e Standard or Superlight tier balances durability and weight across mixed terrain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBikepacking \/ Gravel 29er:\u003c\/strong\u003e 30mm inner width and 592mm ERD accommodate wide-volume tyres suited to loaded touring.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cdl\u003e\n\u003cdt\u003e\u003cstrong\u003eIs a 23mm high carbon rim strong enough for aggressive all-mountain riding?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eYes, for riders under 100 kg. The rim tests at \u0026gt;300 kg forward compressive strength and \u0026gt;50 kg lateral torsion resistance. For sustained rock-garden impacts at heavier rider weights, a 25–30mm profile rim is recommended.\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eHow does this rim's weight compare to aluminium 29er rims?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eA quality double-wall aluminium 29er rim typically weighs 450–550 g. The Ultralight tier of this rim (300 ± 10 g) saves approximately 150–250 g per rim — roughly 300–500 g per wheelset — which measurably reduces rotational inertia for climbing and acceleration.\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eWhat tyres fit a 30mm inner-width rim?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eETRTO guidelines recommend tyres of 2.2–2.6 in (57–66 mm) for a 30mm inner width. Narrower tyres may balloon; wider tyres may exceed bead-seat integrity at maximum pressure.\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eCan this rim be built tubeless?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eYes. The hooked U-shape bead and 6.5mm valve hole are tubeless-ready when paired with a tubeless-compatible tyre, rim tape, and valve. Tubeless conversion kit sold separately.\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eIs custom drilling or spoke count available?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eYes. Spoke hole diameter (default 4.5 mm), valve hole diameter (default 6.5 mm), assembly hole diameter (default 7.5 mm), and nipple angle are all customisable. Contact the manufacturer with build specifications.\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\": \"29er offset ultralight carbon mtb bike rim 23mm high 30mm wide for cross-country or AM,Bola\",\n  \"description\": \"Asymmetric Carbon 29er MTB Rim — 23mm High \/ 30mm Inner Width This hooked asymmetric carbon rim is designed for 29-inch mountain bike wheels used in cross-country (XC) racing and all-mountain (AM) riding. The 30mm inner width supports modern high-volume tyres (2.2–2.6 in) at pressures between 45 and 65 psi, while the 23mm profile keeps rotational weight low without sacrificing lateral stiffness. Available in three weight tiers: Standard (380 ± 15 g) , Superlight (330 ± 10 g) , and Ultralight (300 ± 10 g) per rim. Key Specifications Specification Value Wheel Size 29er (700c compatible) Rim Shape U-shape (hooked) Rim Height 23 mm Outer Width 36 mm Inner Width 30 mm ERD (Effective Rim Diameter) 592 mm Weight – Standard 380 ± 15 g Weight – Superlight 330 ± 10 g Weight – Ultralight 300 ± 10 g Forward Compressive Strength \u0026gt; 300 kg Lateral Torsion Resistance \u0026gt; 50 kg Spoke Hole Tension \u0026gt; 280 kg Dynamic Imbalance \u0026lt; 3 g Flatness Tolerance \u0026lt; 0.15 mm Roundness Tolerance \u0026lt; 0.3 mm Valve Hole Diameter 6.5 mm (customisable) Spoke Hole Diameter 4.5 mm (customisable) Assembly Hole Diameter 7.5 mm (customisable) Nipple Angle Left 5° \/ Right 7° (asymmetric offset; customisable) Min \/ Max Tyre Pressure 45 \/ 65 psi Max Rider Weight 100 kg Design Tradeoffs to Know Before You Buy 23mm rim height vs. deeper profiles: A shallower 23mm section reduces aerodynamic drag penalty in technical terrain and saves 30–60 g versus 30–35mm profiles. It is not optimised for road-style speed riding. 30mm inner width: Supports tyres from approximately 2.2 to 2.6 in. Riders using tyres narrower than 2.1 in may experience reduced tyre-sidewall support. Asymmetric offset (left 5° \/ right 7°): Corrects spoke-tension imbalance on rear wheels driven by cassette offset, improving wheel trueness and fatigue life. Requires asymmetric-aware wheel building. Hooked bead (U-shape): Compatible with both clincher and tubeless-ready tyres. Not a hookless rim — standard clincher and tubeless tyres are fully supported. 100 kg rider weight limit: Suits XC and trail riders. Heavier enduro or downhill riders should consider a higher-volume, reinforced rim model. Compatible Riding Styles Cross-Country (XC) Racing: Ultralight tier (300 ± 10 g) delivers competitive weight savings for race-day builds. Trail \u0026amp; All-Mountain (AM): Standard or Superlight tier balances durability and weight across mixed terrain. Bikepacking \/ Gravel 29er: 30mm inner width and 592mm ERD accommodate wide-volume tyres suited to loaded touring. Frequently Asked Questions Is a 23mm high carbon rim strong enough for aggressive all-mountain riding? Yes, for riders under 100 kg. The rim tests at \u0026gt;300 kg forward compressive strength and \u0026gt;50 kg lateral torsion resistance. For sustained rock-garden impacts at heavier rider weights, a 25–30mm profile rim is recommended. How does this rim's weight compare to aluminium 29er rims? A quality double-wall aluminium 29er rim typically weighs 450–550 g. The Ultralight tier of this rim (300 ± 10 g) saves approximately 150–250 g per rim — roughly 300–500 g per wheelset — which measurably reduces rotational inertia for climbing and acceleration. What tyres fit a 30mm inner-width rim? ETRTO guidelines recommend tyres of 2.2–2.6 in (57–66 mm) for a 30mm inner width. Narrower tyres may balloon; wider tyres may exceed bead-seat integrity at maximum pressure. Can this rim be built tubeless? Yes. The hooked U-shape bead and 6.5mm valve hole are tubeless-ready when paired with a tubeless-compatible tyre, rim tape, and valve. Tubeless conversion kit sold separately. Is custom drilling or spoke count available? Yes. Spoke hole diameter (default 4.5 mm), valve hole diameter (default 6.5 mm), assembly hole diameter (default 7.5 mm), and nipple angle are all customisable. 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