BOLA 29er Carbon MTB Rim | 40mm Wide, 34mm Internal, 30mm

$310.00 USD

~~$350.00 USD~~ $310.00 USD

Sale Sold out

Free shipping | VAT included in EU & USA

Weave UD Matt UD Glossy Marble Matt Marble Glossy

Spoke QTY 28/28 32/32 Customs

Weight Normal Superlight

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.

Specifications

Size: 29er

Material: Genius Toray carbon fiber

Rim Depth: 30mm

Bead Type: Hookless

Inner Width: 34mm

Outer Width: 40mm

ERD (Effective Rim Diameter): 579mm

Weight Tier: Standard 465g, Superlight 410g

Trade-offs & Considerations

Aero vs Crosswind: The 30mm depth is shallow for aerodynamics at trail speeds, and the 40mm outer width is tuned for tire volume rather than wind cheating; there is a negligible crosswind penalty at 10° yaw on open fire roads.

Weight vs Stiffness: The Superlight tier (410g) saves about 55g versus the Standard tier (465g) (±5g); lateral stiffness holds within 3%, but the wide 34mm bed flexes slightly more than a narrower rim, so the lightest layup suits trail and enduro rather than heavy freeride.

Tire-Type Trade-off: The 34mm internal bed is tuned for 2.25 to 2.6 inch tubeless tires; it lets you run 20 to 25 psi for grip but requires hookless-approved casings and sealant.

Sourcing & Delivery Trade-off: Stock drilling ships in 1–3 business days at $310; custom spoke-hole count, valve hole or decals add 7–15 business days and roughly a $40–80 premium.

Performance Test Data

Fatigue Test: 750,000 cycles @640N (ISO 4210-7 Annex A, informative only)

Impact Resistance: >60J (Higher than ISO 4210-7)

Flatness: <0.25mm (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: ≥8N/mm

Max System Weight: 110kgs

Recommended Use Cases

Enduro Racing: Excellent

All-Mountain: Excellent

Trail Riding: Good

Technical Descents: Excellent

Rough Terrain: Excellent

Compatibility

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.

How It Compares

Model	Weight	Depth	Width	Price
29er 30mm Rim 40mm	Standard 465g, Superlight 410g	30mm	40mm	See store
Model A	~455g	25mm	30mm	$389
Model B	~460g	25mm	30mm	$249
Model C	~440g	25mm	30mm	$289

FAQ

Which tyres fit on the 34mm inner rim, and what pressure suits me?

The 34mm inner width takes 2.25"–2.6" enduro tyres; hookless, so fit only ETRTO hookless-rated tubeless tyres and run low enduro pressure around 20–25 PSI.

How do I work out the right spoke length for this rim?

The ERD is 579mm, measured on our standard basis. Use a known calculator (Sapim / DT) and add the manufacturer-recommended correction for this rim.

What is the maximum spoke tension I can run on this rim?

Drive-side / disc-side max tension is 130–140 kgf, with the non-drive side adapted to match; 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 >60J extreme impacts (above the ISO 30J standard). Inner widths of 34mm 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, 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

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