Bola 27.5" Carbon Downhill MTB Rim – 40mm Wide, 32mm Inner, 30mm High
Bola 27.5" Carbon Downhill MTB Rim – 40mm Wide, 32mm Inner, 30mm High
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Bola’s 27.5" carbon downhill MTB rim features a 40mm outer and 32mm inner width, delivering robust tire support and stability for demanding downhill trails. Its T700/T800 carbon layup and 30mm height are rigorously tested to ISO 4210-7, balancing lightweight strength, lateral stiffness, and consistent performance for riders and bike builders seeking reliable rim upgrades at accessible pricing.
Key Features & Specs
- Rim Size: 27.5" (650B, ISO 584mm)
- Outer / Inner Width: 40mm / 32mm (hookless, tubeless-ready)
- Rim Height: 30mm profile – increases lateral stiffness and control
- Material: Unidirectional T700/T800 carbon fiber, high-strength epoxy resin
- Weight: 560g ±5%
- Spoke Count: 28H (J-bend and straight-pull compatible)
- Valve: Presta (6.5mm hole, customizable)
- Recommended Tire Width: 2.0–2.6 inch MTB tires
- Testing & Certification: Internal impact and fatigue testing per ISO 4210-7
- Warranty: 3-year coverage against manufacturing defects
How it Compares
| Feature | This Product (Bola 27.5" DH Rim) |
Performance Model (DH931S 29er 32mm Inner, 600g) |
|---|---|---|
| Rim Size | 27.5" (650B) | 29" |
| Inner Width | 32mm | 31mm |
| Outer Width | 40mm | 41mm |
| Rim Height | 30mm | 32mm |
| Weight | 560g | 600g |
| Material | T700/T800 carbon | T700/T800 carbon |
| Testing | ISO 4210-7, lab QC | ISO 4210-7, reinforced walls |
| Warranty | 3 years | Typically 2–5 years |
Recommended Use Cases
- Downhill MTB builds requiring wide, stable tubeless-ready rims
- Custom bike assembly for competitive or amateur gravity racing
- Upgrading stock aluminum or narrow carbon rims for improved tire support and impact resistance
- Builders and shops outfitting 27.5" MTB frames with modern geometry
- Cross-border B2B partners seeking reliable, cost-effective carbon rim supply for enduro/downhill markets
Frequently Asked Questions
Is a 27.5 inch carbon MTB rim with 40mm outer width good for downhill riding?
Yes, a 27.5 inch carbon rim with 40mm outer and 32mm inner width is ideal for downhill. The wide profile stabilizes large tires, supporting low-pressure setups and reducing burping, meeting competitive downhill standards for control and impact resistance.
What's the advantage of a 32mm inner width rim for mountain bike downhill setups?
A 32mm inner width accommodates 2.4–2.6 inch tires, allowing lower pressures for better grip and a more compliant ride over technical terrain—preferred by aggressive downhill riders for fewer pinch flats and consistent handling.
How does a 27.5er carbon DH rim compare to a 29er rim for aggressive trails?
27.5" rims offer quicker handling and easier acceleration—ideal for technical descents and tighter trails. 29er rims (e.g., 31mm+ inner) roll faster over obstacles but can slightly increase wheel weight and decrease agility for some riders. Selection depends on frame compatibility and riding style.
Are tubeless-ready carbon rims worth it for downhill mountain biking?
Tubeless-compatible carbon rims (hookless) let you run lower tire pressures for better grip, fewer flats, and simplified tire installation. All Bola DH rims follow current downhill standards for tubeless performance and durability.
What rim depth and width should I look for in a downhill mountain bike wheel?
For modern downhill bikes, an inner width between 30–35mm and depth of 25–35mm balances tire support, lateral stiffness, and impact resilience. The Bola 27.5" DH rim features 32mm inner and 30mm depth—matching established DH industry benchmarks.
