• BOLA 88mm Aero Carbon Rim 700C – Hooked Tubeless, 27mm/20mm, TT & Triathlon（副本）
  • BOLA 88mm Aero Carbon Rim 700C – Hooked Tubeless, 27mm/20mm, TT & Triathlon（副本）
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Bola 700C 40mm Carbon Tubeless Road Rim | 28mm Wide

Bola 700C 40mm Carbon Tubeless Road Rim | 28mm Wide

$310.00 USD
$350.00 USD $310.00 USD
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Free shipping  |  VAT included in EU & USA
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Spoke QTY
Weight

The Bola 700C 40mm U-shape carbon tubeless rim - a 28mm-wide disc-brake aero rim for climbing, fast group rides and all-round road builds.

Fast group rides, long training days, decisive climbs - the Bola 40mm U-shape rim brings a carefully engineered balance of aero and compliance. Forty millimetres of carbon, 28mm wide, sold rim-only.

Buying Guide.

Weight tier - Extreme Light ~345g: the climber's pick - lightest end, calm in the gusts.

Weight tier - Ultralight ~365g: the balanced middle - light enough to race, tough enough to train.

Weight tier - Superlight ~390g: the steady build - impact margin for windy training days.

Weight tier - Standard ~425g: the durable daily choice for heavier riders and rough roads.

Max rider weight: rated to 105kg - check rider + gear before ordering.

Same-depth series: the 40mm road/gravel rim is the wide-outer version; the 40mm asymmetric tubeless balances disc spoke tension.

Adjacent depth: the 35mm U-shape climbs better; the 45mm U-shape adds aero.

Target Audience & Usage Notes.

Target audience.: Climbers, gran fondo riders and those in windy terrain.

Rim-only.

Hookless requires ETRTO-certified tyres at 72-87 psi; hooked supports up to 110 psi.

Respect 105kg.

Not for flat TT maximum speed.

The Ride That Awaits.

Build it around a disc road hub, seat a 28-32c tubeless, and the 40mm U-profile threads the needle: fast enough for the flat, light enough for the climbs, calm in every gust. The aero-stability compromise, perfected for your kind of road. Free shipping, a 3-year rim warranty and crash-replacement discount.

Specifications
Size: 700c
Material: Genius Toray carbon fiber
Rim Depth: 40mm
Bead Type: Hooked
Inner Width: 21mm hooked / 23mm hookless
Outer Width: 28mm
ERD (Effective Rim Diameter): 558mm
Weight Tier: Extreme Light 345g / Ultralight 365g / Superlight 390g / Standard 425g (+/-10-15g)
Trade-offs & Considerations
Aero vs Crosswind: The 40mm depth saves about 3.0W versus a 30mm rim at 40km/h; at 10° yaw the shallower 40mm section and 28mm outer width keep steering calm on exposed roads, giving up some aero gain compared with a 50mm rim.
Weight vs Stiffness: The Extreme Light tier (345g) saves about 80g versus the Standard tier (425g) at the same 40mm depth (±5g); lateral stiffness holds within 3% across tiers, so the lightest layup keeps the same rim structure.
Tire-Type Trade-off: The hooked 21mm bead accepts clincher and tubeless tyres from about 25c to 38c up to 110 psi; the hookless 23mm bed runs 27–38c at 72–87 psi with ETRTO-certified tyres, trading a narrower pressure range for a more voluminous, lower-rolling bed.
Sourcing & Delivery Trade-off: Stock drilling ships in 1–3 business days at $310; custom spoke-hole count 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: >200 kgf (internal QC, static spoke-hole point load)
Dynamic Equilibrium: <3g (internal QC)
Radial Stiffness: 62–74 N/mm (internal lab)
Lateral Stiffness: 8–13 N/mm
Max System Weight: 105kg
Recommended Use Cases
Road Racing Builds: 2026 peloton standard is 28-30mm tubeless on wide rims (TdF 2026 avg ≈30mm); 40mm section suits 40+ km/h racing.
Gran Fondo / Endurance: Modern 2026 frames (Propel, SuperSix, S5) design around 30-32mm clearance; 21mm inner bed pairs 25-32mm tubeless per ETRTO 2026 guidance.
Wheel Building: Custom road builds with disc or rim hubs; UD carbon layup options for weight-conscious or durable builds.
Weight Tier Selection: Offered in weight tiers (105kg); lighter for climbing, heavier for training and impact margin.
Compatibility
Frame: 700C road frames with 100mm front / 130-142mm rear disc spacing
Tire Type: Tubeless-ready clincher
Tire Width: 25-35c
Valve: Presta
Brake: Disc only - center-lock or 6-bolt rotor hub
How It Compares
ModelWeightDepthWidthPrice
700C 40mm Rim 28mm Extreme Light 345g / Ultralight 365g / Superlight 390g / Standard 425g (+/-10-15g) 40mm 28mm See store
Model A ~430g 50mm 28mm $1,399
Model B ~430g 50mm 27mm $249
Model C ~420g 50mm 30mm $389
FAQ
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 is the maximum spoke tension for 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.
What tyres can I mount on this rim, and what pressure should I run?
The 21mm hooked version takes 25–38c up to 110psi, while the 23mm hookless version takes 27–38c at 72–87psi with ETRTO-certified tyres.
Is this sold as a complete wheelset, or as a bare rim I build myself?
This is a bare rim only — no hub, spokes, nipples or tape included. You choose the hub and spokes and build it to your spec, or use it as a direct replacement for a damaged rim.
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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