• 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 55mm Tubeless Carbon Rim | 28mm Wide

Bola 700C 55mm Tubeless Carbon Rim | 28mm Wide

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

The Bola 700C 55mm U-shape carbon tubeless rim - a 28mm-wide disc-brake aero rim with hooked or hookless bed for aero road, breakaways and rolling terrain.

Breakaways and rolling efforts reward the Bola 55mm U-shape rim - a mid-deep aero platform that balances speed, tyre volume and strength. Fifty-five millimetres of carbon, 28mm wide, sold rim-only.

Buying Guide.

Weight tier - Extreme Light ~425g: the breakaway racer's pick - lightest end for rolling aero racing.

Weight tier - Ultralight ~445g: the balanced middle - the sweet spot for most all-round aero riders.

Weight tier - Superlight ~465g: the steady build - impact margin for a season of racing.

Weight tier - Standard ~515g: the durable daily choice for larger riders and rough roads.

Max rider weight: rated to 120kg - check rider + gear before ordering.

Same-depth series: the 55mm road rim is the wide-outer version; the 55mm asymmetric tubeless balances disc spoke tension; the 55mm tubular is the glued option.

Adjacent depth: the 45mm U-shape climbs better; the 60mm U-shape goes deeper.

Target Audience & Usage Notes.

Target audience.: Road racers and aero builders on disc.

Rim-only.

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

Respect 120kg.

Not for steep climbing.

The Ride That Awaits.

Build it around a disc road hub, seat a 28-32c tubeless, and feel the breakaway carry you: the U-profile glides over rolling terrain, stable in the wind, eager on the rises, the wheel answering every surge. This is the all-season aero road ride. Free shipping, a 3-year rim warranty and crash-replacement discount.

Specifications
Size: 700c
Material: Genius Toray carbon fiber
Rim Depth: 55mm
Bead Type: Hooked
Inner Width: 21mm hooked / 23mm hookless
Outer Width: 28mm
ERD (Effective Rim Diameter): 528mm
Weight Tier: Extreme Light 425g / Ultralight 445g / Superlight 465g / Standard 515g (+/-10-15g)
Trade-offs & Considerations
Aero vs Crosswind: The 55mm depth saves about 5.5W versus a 35mm rim at 40km/h; at 10° yaw the deeper section shows a noticeably stronger crosswind push than a 45mm rim, suiting sheltered or straight courses more than exposed rolling terrain.
Weight vs Stiffness: The Extreme Light tier (425g) saves about 90g versus the Standard tier (515g) at the same 55mm depth (±5g); heavier Standard/Superlight layups are advised for riders over 100kg.
Tire-Type Trade-off: The hooked 21mm bead runs 25–40c up to 110 psi and accepts more tyre models; the hookless 23mm bed needs ETRTO hookless-certified tyres at 72–87 psi. Running 28–32c avoids the 'light bulb' profile mismatch.
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: >300 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: 120kg
Recommended Use Cases
Road Racing Builds: 2026 peloton standard is 28-30mm tubeless on wide rims (TdF 2026 avg ≈30mm); 55mm 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 (120kg); lighter for climbing, heavier for training and impact margin.
Compatibility
Frame: 700C road frames with 100mm front / 130-142mm rear disc spacing
Tire Type: Clincher/tubeless (hooked or hookless)
Tire Width: 25-40c
Valve: 6.5mm Presta
Brake: Disc only - center-lock or 6-bolt rotor hub
How It Compares
ModelWeightDepthWidthPrice
700C 55mm Rim 28mm Extreme Light 425g / Ultralight 445g / Superlight 465g / Standard 515g (+/-10-15g) 55mm 28mm See store
Model A ~430g 50mm 28mm $1,399
Model B ~430g 50mm 27mm $249
Model C ~420g 50mm 30mm $389
FAQ
Which tyres suit the 21mm hooked and 23mm hookless internals?
The 21mm hooked and 23mm hookless internals are modern road widths tuned for 28–32c tyres; choose hooked if you also run plain clinchers, hookless for lower tubeless rolling resistance.
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.
Do these rims accept standard clincher tyres, and what is the pressure limit on the hookless option?
Hooked rims accept standard clincher tyres directly. For the hookless option, per ETRTO, tubeless tyres 28c and wider must not exceed 72.5 PSI (5.0 bar) to prevent unseating.
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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