{"product_id":"asymmetric-carbon-29er-mtb-rim-23mm-high-26mm-inner-width-xc-trail-300-370g-bola","title":"Asymmetric Carbon 29er MTB Rim – 23mm High, 26mm Inner Width, XC \u0026 Trail, 300–370g (Bola)","description":"\u003ch2\u003eBola Asymmetric Carbon 29er MTB Rim — 23mm Profile, 26mm Inner Width\u003c\/h2\u003e\u003cp\u003eThis asymmetric carbon rim delivers a \u003cstrong\u003e23mm profile height\u003c\/strong\u003e and \u003cstrong\u003e26mm inner width\u003c\/strong\u003e in a 29-inch format, purpose-built for cross-country racing and all-mountain trail riding. Available in three weight tiers: \u003cstrong\u003eNormal (370 ±15g)\u003c\/strong\u003e, \u003cstrong\u003eSuperlight (325 ±10g)\u003c\/strong\u003e, and \u003cstrong\u003eUltralight (300 ±10g)\u003c\/strong\u003e per rim.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\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 Size\u003c\/td\u003e\n\u003ctd\u003e29er (ERD: 589mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRim Profile Height\u003c\/td\u003e\n\u003ctd\u003e23mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Width\u003c\/td\u003e\n\u003ctd\u003e32mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Width\u003c\/td\u003e\n\u003ctd\u003e26mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRim Shape\u003c\/td\u003e\n\u003ctd\u003eU-shape (asymmetric)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight — Normal\u003c\/td\u003e\n\u003ctd\u003e370 ±15g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight — Superlight\u003c\/td\u003e\n\u003ctd\u003e325 ±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\u003eForward Compressive Strength\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;300kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLateral Torsion Resistance\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;50kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpoke Hole Tension Strength\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;280kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDynamic Equilibrium\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;3g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlatness Tolerance\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoundness Tolerance\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNipple Angle\u003c\/td\u003e\n\u003ctd\u003eLeft 5°, Right 7° (or custom)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve Hole Diameter\u003c\/td\u003e\n\u003ctd\u003e6.5mm (or custom)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpoke Hole Diameter\u003c\/td\u003e\n\u003ctd\u003e4.5mm (or custom)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAssembly Hole Diameter\u003c\/td\u003e\n\u003ctd\u003e7.5mm (or custom)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTire Pressure Range\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\u003e100kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eDesign Rationale: Why Asymmetric?\u003c\/h2\u003e\u003cp\u003eThe asymmetric spoke bed offsets the spoke holes to equalise tension between drive-side and non-drive-side spokes. This reduces the spoke tension differential — a known cause of wheel fatigue and spoke breakage — resulting in a more durable, more evenly loaded wheel structure. The 26mm inner width accommodates 2.2–2.6-inch tubeless tires with an optimal casing spread for grip and rolling efficiency on XC and trail terrain.\u003c\/p\u003e\u003ch2\u003eWeight Tier Comparison\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eTier\u003c\/th\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003cth\u003eBest For\u003c\/th\u003e\n\u003cth\u003eTradeoff\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNormal\u003c\/td\u003e\n\u003ctd\u003e370 ±15g\u003c\/td\u003e\n\u003ctd\u003eEnduro, aggressive trail, heavier riders\u003c\/td\u003e\n\u003ctd\u003eHeavier, but maximises structural margin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuperlight\u003c\/td\u003e\n\u003ctd\u003e325 ±10g\u003c\/td\u003e\n\u003ctd\u003eAll-mountain, trail racing\u003c\/td\u003e\n\u003ctd\u003eBalanced weight-to-durability ratio\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUltralight\u003c\/td\u003e\n\u003ctd\u003e300 ±10g\u003c\/td\u003e\n\u003ctd\u003eXC racing, weight-optimised builds\u003c\/td\u003e\n\u003ctd\u003eThinner layup; suits riders under 75kg and smoother XC trails\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cem\u003eNote: The Ultralight variant is optimised for competitive XC use. Riders above 80kg or riding highly technical, rock-heavy terrain are advised to select the Normal or Superlight tier to maintain structural safety margins.\u003c\/em\u003e\u003c\/p\u003e\u003ch2\u003eCustomisation Options\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSpoke hole count: configurable on request\u003c\/li\u003e\n\u003cli\u003eValve hole diameter: 6.5mm standard or custom\u003c\/li\u003e\n\u003cli\u003eSpoke hole diameter: 4.5mm standard or custom\u003c\/li\u003e\n\u003cli\u003eAssembly hole diameter: 7.5mm standard or custom\u003c\/li\u003e\n\u003cli\u003eNipple angle: Left 5° \/ Right 7° standard or custom\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cdl\u003e\n\u003cdt\u003e\u003cstrong\u003eWhat tire widths are compatible with this rim's 26mm inner width?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eA 26mm inner width is ETRTO-compatible with 2.2–2.6-inch (56–66mm) mountain bike tires. It provides an optimal casing spread for both XC race and trail-oriented tires at 45–65 psi tubeless pressures.\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eWhat is the difference between the Ultralight and Normal weight versions?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eThe Ultralight (300 ±10g) uses a thinner carbon layup to reduce weight for XC racing. The Normal (370 ±15g) uses a thicker layup for greater impact resistance. Both share identical spoke tension strength (\u0026gt;280kg) and forward compressive strength (\u0026gt;300kg).\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eAre asymmetric rims worth it for 29er XC and trail builds?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eYes. Asymmetric rims equalise drive-side and non-drive-side spoke tension, reducing fatigue-related spoke failure — a measurable advantage in 29er builds where the larger wheel diameter increases spoke tension variance.\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eIs this rim tubeless-ready?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eThe U-shape profile and 6.5mm valve hole are compatible with tubeless setups. A tubeless rim tape and valve are required and not included.\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eWhat is the maximum rider weight?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eThe rated maximum rider weight is 100kg across all weight tiers. Riders approaching this limit are recommended to select the Normal weight variant for maximum structural margin.\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eDoes Bola offer a warranty on these rims?\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eYes. Bola provides a three-year warranty covering manufacturing defects on carbon rims.\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\": \"Asymmetric 29er ultra light carbon mountain bike rim 23mm high 26mm inner wide for XC or all trail,superlight optional Bola\",\n  \"description\": \"Bola Asymmetric Carbon 29er MTB Rim — 23mm Profile, 26mm Inner Width This asymmetric carbon rim delivers a 23mm profile height and 26mm inner width in a 29-inch format, purpose-built for cross-country racing and all-mountain trail riding. Available in three weight tiers: Normal (370 ±15g) , Superlight (325 ±10g) , and Ultralight (300 ±10g) per rim. Key Specifications Parameter Value Rim Size 29er (ERD: 589mm) Rim Profile Height 23mm Outer Width 32mm Inner Width 26mm Rim Shape U-shape (asymmetric) Weight — Normal 370 ±15g Weight — Superlight 325 ±10g Weight — Ultralight 300 ±10g Forward Compressive Strength \u0026gt;300kg Lateral Torsion Resistance \u0026gt;50kg Spoke Hole Tension Strength \u0026gt;280kg Dynamic Equilibrium \u0026lt;3g Flatness Tolerance \u0026lt;0.15mm Roundness Tolerance \u0026lt;0.3mm Nipple Angle Left 5°, Right 7° (or custom) Valve Hole Diameter 6.5mm (or custom) Spoke Hole Diameter 4.5mm (or custom) Assembly Hole Diameter 7.5mm (or custom) Tire Pressure Range 45–65 psi Max Rider Weight 100kg Design Rationale: Why Asymmetric? The asymmetric spoke bed offsets the spoke holes to equalise tension between drive-side and non-drive-side spokes. This reduces the spoke tension differential — a known cause of wheel fatigue and spoke breakage — resulting in a more durable, more evenly loaded wheel structure. The 26mm inner width accommodates 2.2–2.6-inch tubeless tires with an optimal casing spread for grip and rolling efficiency on XC and trail terrain. Weight Tier Comparison Tier Weight Best For Tradeoff Normal 370 ±15g Enduro, aggressive trail, heavier riders Heavier, but maximises structural margin Superlight 325 ±10g All-mountain, trail racing Balanced weight-to-durability ratio Ultralight 300 ±10g XC racing, weight-optimised builds Thinner layup; suits riders under 75kg and smoother XC trails Note: The Ultralight variant is optimised for competitive XC use. Riders above 80kg or riding highly technical, rock-heavy terrain are advised to select the Normal or Superlight tier to maintain structural safety margins. Customisation Options Spoke hole count: configurable on request Valve hole diameter: 6.5mm standard or custom Spoke hole diameter: 4.5mm standard or custom Assembly hole diameter: 7.5mm standard or custom Nipple angle: Left 5° \/ Right 7° standard or custom Frequently Asked Questions What tire widths are compatible with this rim's 26mm inner width? A 26mm inner width is ETRTO-compatible with 2.2–2.6-inch (56–66mm) mountain bike tires. It provides an optimal casing spread for both XC race and trail-oriented tires at 45–65 psi tubeless pressures. What is the difference between the Ultralight and Normal weight versions? The Ultralight (300 ±10g) uses a thinner carbon layup to reduce weight for XC racing. The Normal (370 ±15g) uses a thicker layup for greater impact resistance. Both share identical spoke tension strength (\u0026gt;280kg) and forward compressive strength (\u0026gt;300kg). Are asymmetric rims worth it for 29er XC and trail builds? Yes. Asymmetric rims equalise drive-side and non-drive-side spoke tension, reducing fatigue-related spoke failure — a measurable advantage in 29er builds where the larger wheel diameter increases spoke tension variance. Is this rim tubeless-ready? The U-shape profile and 6.5mm valve hole are compatible with tubeless setups. A tubeless rim tape and valve are required and not included. What is the maximum rider weight? The rated maximum rider weight is 100kg across all weight tiers. Riders approaching this limit are recommended to select the Normal weight variant for maximum structural margin. Does Bola offer a warranty on these rims? Yes. 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