• 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 45mm Carbon Tubeless Road Rim | 28mm Wide

Bola 700C 45mm 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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The Bola 700C 45mm U-shape carbon tubeless rim - a 28mm-wide disc-brake aero rim with hooked or hookless bed for all-round road racing and endurance.

Ride longer, push harder, dial in faster: the Bola 45mm U-shape rim blends aero depth with wide tyre volume for modern tubeless road performance. Forty-five millimetres of carbon, 28mm wide, sold rim-only.

Buying Guide.

Weight tier - Extreme Light ~355g: the one-wheel-for-everything climber - light for climbs, still aero on the flat.

Weight tier - Ultralight ~375g: the balanced middle - the sweet spot for most all-round racers.

Weight tier - Superlight ~405g: the steady build - impact margin for long endurance days.

Weight tier - Standard ~430g: the durable daily choice for training miles and heavier riders.

Max rider weight: rated to 110kg - check rider + gear before ordering.

Same-depth series: the 45mm road rim is the wide-outer version; the 45mm tubular is the glued race option.

Adjacent depth: the 40mm U-shape climbs better; the 55mm U-shape goes deeper.

Target Audience & Usage Notes.

Target audience.: All-round road racers and gran fondo riders.

Rim-only.

Hookless requires ETRTO-certified tyres at 72-87 psi; hooked supports up to 125 psi.

Respect 110kg.

Not for pure flat TT.

The Ride That Awaits.

Build it around a disc road hub, seat a 28-32c tubeless, and the 45mm U-profile finds the middle way: fast on group rides, soft enough on long days, calm when the wind squares up. One wheelset for every road you ride. Free shipping, a 3-year rim warranty and crash-replacement discount.

Specifications
Size: 700c
Material: Genius Toray carbon fiber
Rim Depth: 45mm
Bead Type: Hooked
Inner Width: 21mm hooked / 23mm hookless
Outer Width: 28mm
ERD (Effective Rim Diameter): 548mm
Weight Tier: Extreme Light 355g / Ultralight 375g / Superlight 405g / Standard 430g (+/-10-15g)
Trade-offs & Considerations
Aero vs Crosswind: The 45mm depth saves about 4.0W versus a 35mm rim at 40km/h; at 10° yaw the 28mm outer width keeps crosswind input manageable, sitting between the calmer 40mm and the more aero but gustier 55mm.
Weight vs Stiffness: The Extreme Light tier (355g) saves about 75g versus the Standard tier (430g) at the same 45mm depth (±5g); lateral stiffness stays within 3% across layups, so the lightest build retains the same rim box.
Tire-Type Trade-off: The hooked 21mm bead accepts 25–38c up to 125 psi; the hookless 23mm bed runs 27–40c at 72–87 psi with ETRTO-certified tyres, trading higher pressure headroom for a wider, lower-rolling tubeless 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: 80–92 N/mm (internal lab)
Lateral Stiffness: 16–23 N/mm
Max System Weight: 110kg
Recommended Use Cases
Road Racing Builds: 2026 peloton standard is 28-30mm tubeless on wide rims (TdF 2026 avg ≈30mm); 45mm 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 (110kg); 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 on hooked version
Tire Width: 25-38mm (hooked) / 27-40mm (hookless)
Valve: 6.5mm Presta
Brake: Disc only - center-lock or 6-bolt rotor hub
How It Compares
ModelWeightDepthWidthPrice
700C 45mm Rim 28mm Extreme Light 355g / Ultralight 375g / Superlight 405g / Standard 430g (+/-10-15g) 45mm 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 25–38mm up to 125psi, while the 23mm hookless version takes 27–40mm 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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