BOLA 29er Carbon MTB Rim | 40mm Wide, 34mm Internal, 30mm
BOLA 29er Carbon MTB Rim | 40mm Wide, 34mm Internal, 30mm
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The Bola 29er hookless carbon enduro rim — a 34mm internal, 30mm-high wide hoop in Toray carbon (410-465g) for aggressive trail and all-mountain.
When the trail tightens and rock gardens loom, a wide rim lets you run lower pressure and grip more soil. This 29er Bola hoop pairs a 34mm inner channel with a 30mm hookless U-shape for enduro confidence.
Buying Guide.
Weight tier - Superlight ~410g: the Light-grade climber's enduro rim - sheds rotational grams for long liaisons and shuttle stages; fine for lighter riders, with a thinner impact margin.
Weight tier - Standard ~465g: the Midweight impact-tolerance build - choose it for aggressive enduro and heavier riders who need a thicker rim on rough stages.
Tire & terrain: the wide channel runs 2.25-2.6" at low enduro pressure for a wide, pinch-flat-resistant contact patch - built for enduro and aggressive trail, not XC lightness.
Same-family: the narrower 29er asymmetric 30mm rim (~$310) is the lighter trail choice when enduro width is overkill; the 29er Carbon DH Rim 40/32/30 ($430) sits above it for true gravity use.
Rated to a 110kg system weight.
Target Audience & Usage Notes.
Enduro and all-mountain riders plus aggressive trail.
Max system weight 110kg; disc only.
Not a dedicated DH rim.
The Ride That Awaits.
Lower your tire pressure and feel the rim find the ground - a wide, low contact patch that claws at rock gardens and laughs at pinch flats. Send it into the chunder and the hookless bead stays sealed, the rim absorbing chatter so the rear tracks where you look. Pick your layup and build it - a 3-year rim warranty has your back when the stage gets rough.
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- Material: Toray carbon
- Rim depth: 30mm
- External width: 40mm
- Internal width: 34mm
- Size: 29er
- Profile: U-shape hookless
- Weight Tier: Standard 465g, Superlight 410g
- Max Tire Pressure: 75
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- Stiffness vs Compliance: The 30mm rim height offers a balance; it's stiff enough for precise handling but with some vertical compliance for comfort on long descents. The high-modulus Toray carbon layup provides a stiffness-to-weight ratio that suits aggressive riding without harshness.
- Weight vs Durability: Choose standard layup at 465g for enhanced impact resistance or superlight at 410g to save 55g per rim. Both meet the same strength benchmarks (>300kg compressive, >50kg lateral), so the trade-off is primarily rotational mass vs. slight weight reduction.
- Tire Volume vs Speed: The wide 34mm inner width supports 2.25-2.6" tires, increasing traction and stability but adding rolling resistance. Narrower tires would be faster but sacrifice grip on technical trails.
- Versatility vs Specialization: Designed for enduro/all-mountain, this rim handles rough terrain and impacts while remaining light. It's not as specialized as a DH rim (which would be heavier) or an XC rim (which would be narrower and lighter), making it a versatile choice for mixed riding.
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- Fatigue Test: 750,000 cycles @640N (ISO 4210-7 Annex A, informative only)
- Impact Resistance: >40J (ISO 4210-7 reference)
- Flatness: <0.25mm (internal QC)
- Roundness: <0.3mm (internal QC)
- Max Spoke Tension: >300kg (internal QC)
- Ultimate Strength: >100kg (internal QC)
- Dynamic Equilibrium: <3g (internal QC)
- Radial Stiffness: 90–110 N/mm (internal lab)
- Lateral Stiffness: ≥8N/mm
- Max System Weight: 110kgs
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- Enduro Racing: Excellent
- All-Mountain: Excellent
- Trail Riding: Good
- Technical Descents: Excellent
- Rough Terrain: Excellent
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- Frame Compatibility: 29er (622mm BSD) rims compatible with most modern 29er mountain bike frames; check clearance for tire width and fork/chainstay spacing.
- Tire Type: Tubeless-ready, hookless bead; use tubeless or tubeless-convertible tires.
- Tire Width Range: 2.25"–2.6"
- Brake Standard: Disc brake only (6-bolt or centerlock rotor not specified; ensure compatible hub)
- Drivetrain: Not specified; compatible with standard MTB drivetrains (e.g., Shimano, SRAM) as it's just a rim.
- Rotor Standard: Not specified; typically 6-bolt or centerlock depending on hub, but rim itself doesn't affect rotor mount.
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|---|---|---|---|---|---|---|---|
| Carbon MTB Rim | N/A | N/A | N/A | 410-465g | 30mm | 34mm | see store |
| M730 | N/A | N/A | N/A | 400g | 30mm | 34mm | ~$1200 |
| 3Zero Moto | N/A | N/A | N/A | 450g | 30mm | 34mm | ~$1000 |
| Control | N/A | N/A | N/A | 430g | 30mm | 34mm | ~$800 |
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How do I set up this rim tubeless?
This rim is hookless and tubeless-ready, so you can use standard tubeless tape and valves. Apply tape across the rim bed, install the valve, mount a tubeless tire, and inflate to seat the bead. Use a sealant like Stan's or Muc-Off. Recommended tire pressure is typically 20-25 psi for enduro, but check tire manufacturer's guidelines. The hookless bead ensures a secure fit without pinch flats.
What tire sizes are compatible?
The 34mm inner width supports 2.25-2.6 inches inflated tire widths. For enduro, a 2.4-2.6 rear and 2.5-2.6 front is common. The wide rim increases air volume and contact patch, improving traction and stability. Always ensure the tire is tubeless-compatible and designed for hookless rims.
How much weight can I save with the superlight layup?
The superlight layup saves approximately 55g per rim compared to the standard (410g vs 465g). This reduces rotational mass, improving acceleration and climbing efficiency. Both layups meet the same strength benchmarks, so the trade-off is minimal. For a set of two rims, you save about 110g, which can be noticeable in acceleration.
Can I build this rim with my own spokes and hub?
Yes, the rim is designed for custom wheelbuilding. With an ERD of 579mm, you can calculate spoke lengths for your chosen hub and lacing pattern (typically 32 spokes for MTB). The rim has a standard nipple seat and is compatible with common spoke nipples. It's recommended to use a high-quality spoke and nipple to maintain tension.
How do I inspect and maintain the rim?
Regularly check for cracks, delamination, or impacts. After hard rides, inspect the rim bed and spoke holes for damage. Clean the rim with mild soap and water, and avoid using harsh chemicals. Ensure spoke tension is even and re-true as needed. The 3-year warranty covers defects but not damage from crashes or misuse.
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