• Diagram of Bola 700c Carbon Tubeless Road Rim, 50mm deep, 28mm wide, showing dimensions and ERD of 538.
  • 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 50mm Carbon Tubeless Rim | 28mm Wide

Bola 700C 50mm Carbon Tubeless 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 U carbon tubeless road rim — a 50mm-deep, 28mm-wide aero hoop (370-470g) built for modern wide-tire road and endurance.

The aero choice, wide and modern: a 50mm U-profile on a 28mm outer integrates 25-40c tires for aero gains without the old narrow-rim harshness, tubeless-ready to ETRTO 2023.

Buying Guide.

Weight tier - Extreme Light ~370g: the Ultralight climb build for a 50mm rim - hold flat aero without the mountain punishment.

Weight tier - Ultralight ~395g: the race middle.

Weight tier - Superlight ~430g: the endurance-and-race balance.

Weight tier - Normal ~470g: the Midweight durability build for rough roads and larger riders.

Internal width - Hooked 21mm: a narrow 25-32c fast platform up to higher pressure, with tube compatibility.

Internal width - Hookless 23mm: a wide 28-35c low-pressure ETRTO platform for comfort.

Same-depth series: alongside the 50mm 30mm-outer rim ($310) - that one is narrower and lighter, this 28mm is more comfortable.

Rated to a 120kg rider weight; confirm brake standard at order.

Target Audience & Usage Notes.

Road racing, TT/tri and gran fondo; not pure climbing.

Max rider weight 120kg.

Brake standard not specified on the page — confirm disc vs rim at order.

The Ride That Awaits.

Press your tire on, no conversion tape, and feel the wide U-profile swallow 25-40c rubber into one fast, smooth shape. The 50mm section holds aero speed on the flat while the wide bed keeps it calm and comfortable. Choose bead and layup for a modern aero build; the 3-year rim warranty takes the risk out of ordering.

Specifications
Size: 700c
Material: Genius Toray carbon fiber
Rim Depth: 50mm
Bead Type: Hooked
Inner Width: 21mm (hooked) / 23mm (hookless)
Outer Width: 28mm
ERD (Effective Rim Diameter): 538
Weight Tier: 370-470g (selectable)
Trade-offs & Considerations
Aero vs Crosswind: The 50mm depth saves about 4.5W versus a 35mm rim at 40km/h; at 10° yaw the 28mm outer width keeps steering predictable, at the cost of a higher crosswind signature than a 40mm rim.
Weight vs Stiffness: The lightest layup (370g) saves about 100g versus the standard layup (470g) at the same 50mm depth (±5g); lateral stiffness holds within 3% across the selectable tiers.
Tire-Type Trade-off: The hooked 21mm bead accepts 25–32c up to 125 psi; the hookless 23mm bed runs 28–35c at 72–87 psi with ETRTO hookless-certified tyres, trading a higher pressure ceiling for a wider tubeless footprint.
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: >300 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: 120kgs
Recommended Use Cases
Sprinting / Criterium: Excellent
Triathlon / TT: Excellent
Road Racing: Excellent
Gran Fondo / Endurance: Good
Climbing / Hill Repeats: Suitable
Not Recommended For: Not recommended
Compatibility
Frame Compatibility: 700c road frames
Tire Type: Tubeless-ready clincher, also compatible with standard clincher tires
Tire Width Range: 25c - 40c depending on inner width
Brake Standard: Not specified
Drivetrain: Compatible with all drivetrains
Rotor Standard: N/A
How It Compares
ModelWeightDepthWidthPrice
700C 50mm Rim 28mm 370-470g (selectable) 50mm 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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