BOLA 29er Carbon Downhill MTB Rim | 40mm Wide, 32mm Internal
BOLA 29er Carbon Downhill MTB Rim | 40mm Wide, 32mm Internal
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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.
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- Material: Toray UD Carbon Fiber
- Rim depth: 30mm
- External width: 40mm
- Internal width: 32mm
- Size: 29 inch
- Profile: Hookless
- Weight Tier: 620g
- Max Tire Pressure: 65
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- Stiffness vs Compliance: This rim prioritizes lateral stiffness (≥8N/mm) for precise handling at high speeds, sacrificing some vertical compliance for comfort on rough trails.
- Tire Volume vs Speed: Wide 32mm inner width supports 2.0–2.6" tires for enhanced traction and lower pressures, but reduces aerodynamic efficiency compared to narrower rims.
- Weight vs Durability: 620g weight is heavier than XC rims, but the T700/T800 carbon layup and impact strength >40J ensure durability for downhill abuse.
- Versatility vs Specialization: Designed specifically for downhill and enduro, it excels in aggressive terrain but is not suitable for XC or road riding.
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- Fatigue Test: 750,000 cycles @640N (ISO 4210-7 Annex A, informative only)
- Impact Resistance: >60J (ISO 4210-7 reference)
- Flatness: <0.15mm (internal QC)
- Roundness: <0.3mm (internal QC)
- Max Spoke Tension: >350kg (internal QC)
- Ultimate Strength: >350kg (internal QC)
- Dynamic Equilibrium: <3g (internal QC)
- Radial Stiffness: 90–110 N/mm (internal lab)
- Lateral Stiffness: >=10N/mm
- Max System Weight: 110 kgs
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- 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.
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- 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
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| Translation missing: en.product.metafields.model | Translation missing: en.product.metafields.hub | Translation missing: en.product.metafields.spoke | Translation missing: en.product.metafields.bearing | Translation missing: en.product.metafields.weight | Translation missing: en.product.metafields.depth | Translation missing: en.product.metafields.width | Translation missing: en.product.metafields.price |
|---|---|---|---|---|---|---|---|
| Bola 29er Carbon Rim | N/A | N/A | N/A | 620g | 30mm | 32mm | see store |
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How to set up tubeless on this rim?
Use tubeless tape designed for hookless rims, apply 2 layers of tape covering the center channel, then install a tubeless valve (6.5mm Presta hole) and mount a tubeless-ready tire. Inflate to seat the bead; recommended tire pressure is typically 20-30 psi depending on rider weight and terrain. Check for leaks with soapy water.
What tire widths are compatible?
This rim is designed for 2.0–2.6" MTB tires. The 32mm inner width provides a stable platform for larger volume tires, improving traction and reducing tire roll. Wider tires up to 2.6" are ideal for downhill, while narrower 2.0" tires can be used for less aggressive riding.
How much weight can I save compared to alloy rims?
A typical alloy DH rim weights around 900-1000g, so this carbon rim can save approximately 280-380g per wheel. The exact savings depend on the alloy rim's weight and construction. This reduction in rotational mass improves acceleration and handling.
Can I build this rim with any hub?
Yes, the rim is drilled for 28 spokes and has an ERD of 579mm, compatible with standard J-bend or straight-pull spokes. It fits common hub standards (15x100/20x110 front, 12x148/12x150 rear) but the hub flange size must match the spoke length. Custom-built wheel options are available.
How to maintain and inspect carbon rims for damage?
Regularly inspect for cracks, delamination, or impact damage, especially after hard rides. Use a coin tap test to listen for hollow or dull sounds. Check spoke tension and true the wheel periodically. Avoid excessive heat from rim brakes (use disc brakes). Store away from direct sunlight and extreme temperatures.
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