• 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
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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): TBD
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: >40J (ISO 4210-7 reference)
Flatness: <0.25mm (internal QC)
Roundness: <0.3mm (internal QC)
Max Spoke Tension: >300kg (internal QC)
Ultimate Strength: >100kg (internal QC)
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
FAQ
Is the rim tubeless ready?
Yes. It is built to ETRTO tubeless standards; fit a tubeless valve, sealant and rim tape — no separate conversion kit is needed.
What tyre widths and pressures fit?
The hooked 21mm bed runs 25–32c up to 125 psi; the hookless 23mm bed runs 28–35c at 72–87 psi and requires ETRTO-approved hookless tyres.
What is the ERD?
The Effective Rim Diameter is listed as TBD; confirm with the factory for exact spoke-length calculation before building.
Which weight tiers are selectable?
The layup runs 370–470g depending on build grade (±10–15g); the lightest 370g is for racing, the heavier end for training.
Can I customize the drilling?
Yes — valve hole, spoke hole, assembly hole and nipple angle can be customized, along with hooked or hookless inner width and layup grade.
Warranty & Shipping
Warranty Period: 3 years
Crash Replacement: 30% discount on replacement parts
Processing Time: 1–3 business days (standard stock); 7–15 business days (custom)
Estimated Delivery: 7–15 business days (standard); 3–5 business days (expedited)
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