BOLA 29er Carbon Downhill MTB Rim | 40mm Wide, 32mm Internal
BOLA 29er Carbon Downhill MTB Rim | 40mm Wide, 32mm Internal
Regular price
$430.00 USD
Sale price
$430.00 USD
Free shipping | VAT included in EU & USA
Quantity
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The Bola 29er carbon downhill rim - a 30mm-deep, 40mm-external / 32mm-internal hookless MTB rim, ~620g, T700/T800, for enduro and gravity on 29 inch bikes.
The 29 inch sentinel of the bike park - a wide, hookless rim that holds the line through rough descents and refuses to yield to repeated punishment.
Buying Guide.
Internal width - 32mm: 2.3-2.6 inch enduro tyres at ~20-30 PSI for traction and tyre roll resistance on rough descents.
Riding style: a heavy, stiff 29er gravity rim for downhill, enduro, freeride and bike park; not for XC, road or bikepacking.
Build choice: hookless bed demands hookless-approved tyres; the many drilling options fit common MTB hub standards.
Family comparison: the 27.5 DH rim ($430) is the smaller-wheel sibling; the 29er 34mm enduro rim ($310) is a lighter trail option.
Disc builds only; respect the system weight limit.
Target Audience & Usage Notes.
downhill, enduro, freeride and aggressive trail riders on 29 inch bikes.
Disc-only; axles front 15x100/20x110, rear 12x148/12x150. 2.0-2.6 inch hookless-approved tyres. 110kg system weight.
The Ride That Awaits.
Built tubeless with a 2.4 inch tyre it feels planted and bombproof through rough, rooty descents - the wide hookless bed locks the casing in, so you can send it and trust the landing.
Point it down and go.
Free shipping and a 3-year rim warranty support the build.
Specifications
Size: 29er
Material: Genius Toray carbon fiber
Rim Depth: 30mm
Bead Type: Hookless
Inner Width: 32mm
Outer Width: 40mm
ERD (Effective Rim Diameter): 579mm
Weight Tier: 620g
Trade-offs & Considerations
Aero vs Crosswind: Aerodynamics are not the design goal: the 40mm outer width and 30mm depth are tuned for tyre volume and impact absorption rather than drag. At typical downhill speeds the shallow 30mm profile adds almost no crosswind load, while the wide bed stabilises 2.4-2.6 inch tyres under cornering side loads.
Weight vs Stiffness: The 620g downhill layup sits about 160-180g above a 440-460g trail rim (±5g) to survive rock strikes and high-speed impacts; lateral stiffness is deliberately high for precise cornering, at the cost of noticeably higher rotational mass than a trail rim.
Tire-Type Trade-off: The hookless bead runs tubeless 2.0-2.6 inch MTB tyres at 20-30 psi for grip and pinch-flat resistance; hookless demands tubeless-ready tyres and respects a pressure ceiling, so it is not an open hooked rim for high-pressure tubular setups.
Sourcing & Delivery Trade-off: The stock 28-hole drilling ships in 1-3 business days at $430; a custom spoke-hole count or decals add 7-15 business days and a roughly $40-80 premium.
Performance Test Data
Fatigue Test: 750,000 cycles @640N (ISO 4210-7 Annex A, informative only)
Impact Resistance: >170J (Higher than ISO 4210-7)
Flatness: <0.15mm (internal QC)
Roundness: <0.3mm (internal QC)
Max Spoke Tension: >350 kgf (internal QC, spoke breaking tension)
Ultimate Strength: >100 kgf (internal QC, static spoke-hole point load)
Dynamic Equilibrium: <3g (internal QC)
Radial Stiffness: 90–110 N/mm (internal lab)
Lateral Stiffness: >=10N/mm
Max System Weight: 110 kgs
Recommended Use Cases
Downhill Racing: Excellent. Designed for aggressive downhill with high impact strength and wide tire support.
Enduro / Gravity Riding: Excellent. Suitable for enduro and gravity-focused riding, offering stability and durability.
Aggressive Trail Riding: Good. Can handle rough trails but a bit heavy for general trail use.
Freeride / Bike Park: Excellent. Built for jumps and drops with strong carbon layup.
Cross-Country / Climbing: Not recommended. Too heavy and wide for XC efficiency.
Not Recommended For: Road or gravel riding due to MTB-specific width and profile.
Compatibility
Frame Compatibility: 29er MTB frames with standard width axles (front 15x100/20x110, rear 12x148/12x150)
Tire Type: Tubeless-ready with hookless bead, compatible with tube-type tires as well
Tire Width Range: 2.0–2.6" (recommended)
Brake Standard: Disc brake only
Drivetrain: Compatible with any drivetrain that matches the hub standards
Rotor Standard: Compatible with standard 6-bolt or centerlock depending on hub
How It Compares
| Model | Weight | Depth | Width | Price |
|---|---|---|---|---|
| 29er 30mm Rim 40mm | 620g | 30mm | 32mm | See store |
| Model A | ~455g | 25mm | 30mm | $389 |
| Model B | ~460g | 25mm | 30mm | $249 |
| Model C | ~440g | 25mm | 30mm | $289 |
FAQ
Do I get a bare rim here, or is it built up with a hub and spokes?
It's a bare carbon rim — no hub, spokes or nipples. Take it to any wheel builder to lace it to your own hub; we can also supply a built wheel on request.
What spoke drillings are available, and which brake type is this rim rated for?
Spoke drillings and brake rating depend on the build option, selectable at checkout. If you plan to lace your own wheel, confirm the drilling and brake type with Bola before ordering so the rim matches your hub and frame.
What spoke tension can I safely build to — will the holes pull out of the carbon?
Drive-side / disc-side maximum tension is 130–140 kgf, with the non-drive side adapted to match; the spoke holes are locally reinforced inside the carbon layup to prevent pull-out cracking.
Will the rim crack on rock gardens or bottom-outs at low pressure?
The bead area uses a thickened impact-reinforced layer; impact testing passes >170J extreme impacts (above the ISO 30J standard). Inner widths of 32mm accept wider tyres, which deform to absorb shock at low pressure.
Will I really pay no customs or VAT for delivery to the US and EU?
Yes. The Economy channel ships DDP — duties and VAT are fully prepaid by us, cleared in advance, and delivered to your door with no extra payment to customs or the courier.
Warranty & Shipping
Warranty Period: 3 years
Crash Replacement: 30% discount on replacement parts
Processing Time: In stock: 1–3 business days · Out of stock or custom order: 7–15 business days
Shipping method: FedEx/UPS/DPD/EMS Economy (free with duties & VAT included in USA & EU) · Expedited option available
Estimated Delivery: Economy 7–20 business days · Expedited 3–7 business days, customs clearance excluded
