Bola 27.5" Carbon Downhill MTB Rim – 40mm Outer / 32mm Inner, 30mm Height

Take confident lines on steep, technical descents with a rim built to support aggressive downhill setups and modern tire profiles. The Bola 27.5" carbon downhill rim pairs a wide, tubeless-ready bed with industry-grade carbon layup and ISO 4210-7 testing so you can spec wheels that favor stability, impact resistance, and consistent performance on demanding trails.

Bola 27.5" Carbon Downhill MTB Rim - Designed for downhill and gravity riding

The wide 40mm outer / 32mm inner profile stabilizes large-volume tires and lets riders run lower pressures for improved traction and compliance over rough terrain. A 30mm rim height increases lateral stiffness for sharper cornering control while the unidirectional T700/T800 carbon construction delivers a balance of lightweight strength and durability backed by internal impact and fatigue testing.

Why it fits your routine

• Wide tubeless-ready bed: 40mm outer and 32mm inner (hookless) supports 2.0–2.6" MTB tires, reducing burping and improving sidewall support at low pressures.
• Purpose-built stiffness: 30mm rim profile increases lateral stiffness and control for aggressive cornering and high-speed track sections.
• Lightweight carbon layup: Unidirectional T700/T800 carbon fiber with high-strength epoxy resin keeps rim weight at approximately 560g ±5% while maintaining structural performance.
• Compatibility and build options: 28H drilling accepts J-bend and straight-pull spokes; Presta valve hole (6.5mm) for standard tubeless builds and customizable valve choices.
• Tested to industry standards: Internal impact and fatigue testing conducted in accordance with ISO 4210-7 for downhill applications.
• Warranty support: 3-year coverage against manufacturing defects provides assurance for riders and builders.
• Practical upgrade path: Ideal for replacing narrow aluminum rims or older carbon hoops to increase tire support, reduce pinch flats, and improve ride consistency on gravity terrain.

Spec sheet highlights include 27.5" (650B, ISO 584mm) rim size, 560g ±5% weight, 28-hole spoke count, and a Presta valve specification with a 6.5mm hole. Recommended tire width is 2.0–2.6 inches, matching modern downhill tire choices and low-pressure setups. The rim's hookless, tubeless-ready construction and reinforced carbon layup are tailored to builders, shops, and riders seeking a cost-effective carbon option for 27.5" downhill wheelsets.