{"product_id":"29er-carbon-mtb-dh-rim-40mm-outer-32mm-inner-wide-30mm-high-for-down-hill-bola","title":"Bola 29er Carbon DH MTB Rim – 40mm Outer, 32mm Inner, 30mm High","description":"\u003cp\u003e\u003cstrong\u003eBola's 29er Carbon DH MTB Rim features a 40mm outer and 32mm inner width with a 30mm deep profile, optimized for aggressive downhill performance, heavy riders, and competitive endurance cycling. Designed and tested for high-strength and stability using T700\/T800 unidirectional carbon fiber, this rim supports tubeless tire systems and advanced spoke lacing for 29-inch mountain bikes.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch2\u003eKey Features \u0026amp; Specifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntended Use:\u003c\/strong\u003e Downhill MTB, enduro, gravity-focused riding\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRim Size:\u003c\/strong\u003e 29\" (ISO 622mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e T700\/T800 unidirectional carbon fiber with epoxy resin matrix\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter Width:\u003c\/strong\u003e 40mm  |  \u003cstrong\u003eInner Width:\u003c\/strong\u003e 32mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProfile Height:\u003c\/strong\u003e 30mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 620g (±15g per rim)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpoke Count:\u003c\/strong\u003e 28H\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eERD:\u003c\/strong\u003e 579mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eValve Hole:\u003c\/strong\u003e 6.5mm Presta (customizable)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTire Compatibility:\u003c\/strong\u003e Tubeless-ready, 2.0–2.6\" MTB tires\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax Rider Weight:\u003c\/strong\u003e 120kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eStrength \u0026amp; Precision\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eMetric\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\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\u003eSpoke Hole Tension\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;280kg\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\u003eDynamic Balance\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\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eMounting \u0026amp; Use Cases\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e28-hole design\u003c\/strong\u003e fits standard J-bend and straight-pull spokes (4.5mm spoke hole)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide 32mm inner width\u003c\/strong\u003e maximizes tire stability and traction for aggressive trail and downhill use compared to typical 25-30mm rims\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTubeless-ready\u003c\/strong\u003e with hookless bead for lower pressures and improved puncture resistance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCustomizable spoke\/valve hole diameters\u003c\/strong\u003e available to fit team or OEM builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBranded Quality\u003c\/h3\u003e\n\u003cp\u003eTrusted by cycling professionals and race teams in Europe and North America, Bola rims are rigorously tested according to ISO 4210-7 (impact and fatigue). Durable, sustainable, and quality-focused — engineered for reliability and high performance at accessible pricing.\u003c\/p\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eFits 29\" \/ 700c wheel systems\u003c\/li\u003e\n  \u003cli\u003eSupports 2.0–2.6\" tubeless MTB tires\u003c\/li\u003e\n  \u003cli\u003eCompatible with Presta valves only (Schrader requires alteration)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails class=\"gfai-product-faq\" open\u003e\u003csummary\u003e\u003cstrong\u003eIs a 29er carbon rim with 40mm width good for downhill mountain biking?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eYes, the 40mm outer\/32mm inner width provides a wide tire bed ideal for downhill. It supports modern tire profiles for increased traction and control on steep or technical descents.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails class=\"gfai-product-faq\" open\u003e\u003csummary\u003e\u003cstrong\u003eWhat are the benefits of a 32mm inner wide rim for aggressive trail riding?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eA 32mm inner rim width allows larger-volume tires to seat with a rounder profile, which improves cornering stability, reduces tire roll, and lowers the chance of pinch flats.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails class=\"gfai-product-faq\" open\u003e\u003csummary\u003e\u003cstrong\u003eHow does a 29-inch carbon DH rim compare to alloy rims for durability?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eCompared to most alloy rims, this T700\/T800 carbon DH rim offers superior fatigue resistance, lateral stiffness, and higher impact strength due to advanced layup and manufacturing controls. While alloy rims can dent under extreme impacts, carbon maintains structure until failure but is less easily repaired.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails class=\"gfai-product-faq\" open\u003e\u003csummary\u003e\u003cstrong\u003eWill a 28 spoke carbon MTB rim handle heavy riders on rough descents?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eWith a 28 spoke build and \u0026gt;300kg compressive strength, this rim is tested for up to 120kg rider weight on DH terrain. Consistent spoke tension is required for maximum performance.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails class=\"gfai-product-faq\" open\u003e\u003csummary\u003e\u003cstrong\u003eIs this rim compatible with tubeless tires for downhill biking?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eYes, this rim is tubeless-ready and supports standard tubeless tape and valves. Use at least two wraps of 33mm tape for a secure seal with aggressive downhill tires.\u003c\/p\u003e\u003c\/details\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\/\",\n  \"@type\": \"Product\",\n  \"name\": \"29er Carbon MTB DH Rim – 40mm Outer \/ 32mm Inner Wide, 30mm high for Down hill | Bola\",\n  \"description\": \"Bola's 29er Carbon DH MTB Rim features a 40mm outer and 32mm inner width with a 30mm deep profile, optimized for aggressive downhill performance, heavy riders, and competitive endurance cycling. Designed and tested for high-strength and stability using T700\/T800 unidirectional carbon fiber, this rim supports tubeless tire systems and advanced spoke lacing for 29-inch mountain bikes. Key Features \u0026 Specifications Intended Use: Downhill MTB, enduro, gravity-focused riding Rim Size: 29\\\" (ISO 622mm) Material: T700\/T800 unidirectional carbon fiber with epoxy resin matrix Outer Width: 40mm \u0026nbsp;|\u0026nbsp; Inner Width: 32mm Profile Height: 30mm Weight: 620g (±15g per rim) Spoke Count: 28H ERD: 579mm Valve Hole: 6.5mm Presta (customizable) Tire Compatibility: Tubeless-ready, 2.0–2.6\\\" MTB tires Max Rider Weight: 120kg Strength \u0026 Precision Metric Value Forward Compressive Strength \u0026gt;300kg Spoke Hole Tension \u0026gt;280kg Lateral Torsion Resistance \u0026gt;50kg Dynamic Balance \u0026lt;3g Flatness Tolerance \u0026lt;0.15mm Roundness Tolerance \u0026lt;0.3mm Mounting \u0026 Use Cases 28-hole design fits standard J-bend and straight-pull spokes (4.5mm spoke hole) Wide 32mm inner width maximizes tire stability and traction for aggressive trail and downhill use compared to typical 25-30mm rims Tubeless-ready with hookless bead for lower pressures and improved puncture resistance Customizable spoke\/valve hole diameters available to fit team or OEM builds Branded Quality Trusted by cycling professionals and race teams in Europe and North America, Bola rims are rigorously tested according to ISO 4210-7 (impact and fatigue). Durable, sustainable, and quality-focused — engineered for reliability and high performance at accessible pricing. Compatibility Fits 29\\\" \/ 700c wheel systems Supports 2.0–2.6\\\" tubeless MTB tires Compatible with Presta valves only (Schrader requires alteration) Frequently Asked Questions Is a 29er carbon rim with 40mm width good for downhill mountain biking? Yes, the 40mm outer\/32mm inner width provides a wide tire bed ideal for downhill. It supports modern tire profiles for increased traction and control on steep or technical descents. What are the benefits of a 32mm inner wide rim for aggressive trail riding? A 32mm inner rim width allows larger-volume tires to seat with a rounder profile, which improves cornering stability, reduces tire roll, and lowers the chance of pinch flats. How does a 29-inch carbon DH rim compare to alloy rims for durability? Compared to most alloy rims, this T700\/T800 carbon DH rim offers superior fatigue resistance, lateral stiffness, and higher impact strength due to advanced layup and manufacturing controls. While alloy rims can dent under extreme impacts, carbon maintains structure until failure but is less easily repaired. Will a 28 spoke carbon MTB rim handle heavy riders on rough descents? With a 28 spoke build and \u003e300kg compressive strength, this rim is tested for up to 120kg rider weight on DH terrain. Consistent spoke tension is required for maximum performance. Is this rim compatible with tubeless tires for downhill biking? Yes, this rim is tubeless-ready and supports standard tubeless tape and valves. 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