• 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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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: >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: 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
FAQ
What tyre widths fit this rim?
The hooked 21mm bed runs 25–38c; the hookless 23mm bed runs 27–40c. 28c is the road aero sweet spot.
What is the ERD for spoke length calculations?
548mm, with 20/20 holes and a 6.5mm valve hole. Use this Effective Rim Diameter for custom builds.
Is it tubeless ready?
Yes. The hooked bead mounts tubeless clinchers; use tubeless tape, a valve and sealant to seal the bed.
Which weight tiers are available?
Extreme Light 355g, Ultralight 375g, Superlight 405g and Standard 430g (±10–15g); the heavier tiers suit training builds.
Which brake type?
Disc brake only — there is no rim-brake braking surface.
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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