• Bola 700c 45mm Carbon Road Rim – 34mm Outer, 28mm Inner, Tubeless Ready
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700C Tubeless Carbon Rim 45mm Asymmetric 32mm Wide | Bola

700C Tubeless Carbon Rim 45mm Asymmetric 32mm Wide | Bola

$340.00 USD
$400.00 USD $340.00 USD
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A 45mm offset/asymmetric carbon rim with 38/32mm widths for 37–52mm tires, tubeless-ready, and four weight tiers for road and gravel endurance.

Wide-Bed Endurance Platform

The BOLA 45mm asymmetric rim shifts the spoke anchor 2–3mm drive-side to equalise tension. Its 38mm outer and 32mm inner width supports 37–52mm tubeless tires for comfort and traction on mixed-surface endurance rides.

Buying Guide.

Weight tier - Extreme Light ~390g: sub-90kg climbers on smooth tarmac.

Weight tier - Ultralight ~410g: the race-day sweet spot.

Weight tier - Superlight ~445g: all-day gran fondo, durable enough for rough roads.

Weight tier - Normal ~470g: riders over ~90kg and heavy miles; the beefiest choice.

Internal width - 32mm: an extra-wide bed for 37-52mm tires; choose it when comfort and traction matter more than raw speed.

Adjacent depth - the offset evens tension; the narrower Bola beds favor pure road speed, this one favors mixed surfaces.

Target Audience & Usage Notes.

Endurance and gran fondo riders, all-road gravel explorers, and custom wheelset builders.

Not for aggressive off-road or mountain biking.

The Ride That Awaits.

Roll out at dawn on a mixed-surface day and feel the wide, offset bed settle under you - 37-52mm tires at low pressure eating chipseal and dirt alike, the stiff carbon whispering rather than complaining. It is endurance, made comfortable. Free shipping and a 3-year warranty mean the gran fondo is one order away.

Specifications
Size: 700c
Material: Genius Toray carbon fiber
Rim Depth: 45
Bead Type: Hooked
Inner Width: 32
Outer Width: 38
ERD (Effective Rim Diameter): TBD
Weight Tier: Normal (470±15g), Superlight (445±15g), Ultralight (410±10g), Extreme Light (390±10g)
Trade-offs & Considerations
Aero vs Crosswind: 45mm depth saves about 3.5W versus a 32mm rim at 40km/h, but the wide 38mm outer section raises the crosswind signature at 10° yaw; the offset drilling trues up spoke tension for the disc side rather than calming the wind.
Weight vs Stiffness: The Extreme Light tier (390g) saves about 80g versus the Normal tier (470g) at the same 45mm depth (±5g); lateral stiffness stays within 3% across tiers, but the lightest layup suits riders under 90kg and smooth roads.
Tire-Type Trade-off: The 32mm internal width accepts 40c–50c gravel and 28–32c road tubeless tyres; the wide bed lowers rolling resistance at lower pressure, while the hooked bead still supports higher pressures than a hookless design.
Sourcing & Delivery Trade-off: Stock drilling ships in 1–3 business days at $340; 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: 110kgs
Recommended Use Cases
Climbing / Hill Repeats: Good: Moderate weight and depth offer a balance; choose lighter weight tier for best climbing performance.
Gran Fondo / Endurance: Excellent: Wide inner width and tubeless compatibility provide comfort and traction for long rides.
Road Racing: Good: Aero profile and stiffness suit racing, though not as aero as deeper rims.
Sprinting / Criterium: Suitable: Stiffness is adequate, but deeper rims offer more aero advantage for sprints.
Training / Daily Riding: Excellent: Durable options and tubeless seal reduce puncture risk for daily use.
Not Recommended For: Not recommended for aggressive off-road or mountain biking due to road-focused design.
Compatibility
Frame Compatibility: Compatible with 700C road and gravel frames designed for disc brakes, though brake type is not specified.
Tire Type: Tubeless-ready clincher tires.
Tire Width Range: 37-52mm
Brake Standard: Not specified; likely disc.
Drivetrain: Compatible with 11- or 12-speed drivetrains.
Rotor Standard: N/A (rim only)
How It Compares
FAQ
What tyre widths fit this rim?
With a 32mm internal width, run 40c–50c gravel or 28–32c road clincher/tubeless; the sweet spot is 40–45c for gravel.
What is the ERD for spoke length?
TBD — confirm the effective rim diameter with your wheel builder before ordering spokes, as the asymmetric offset changes spoke length.
Is the rim tubeless ready?
Yes, the sealed hooked bed mounts tubeless tyres; use tape, valve and sealant.
What does the asymmetric offset do?
It shifts the spoke holes to balance tension on the disc-brake side, improving lateral stiffness and durability without changing the 45mm depth.
Which weight tiers are available?
Normal (470g), Superlight (445g), Ultralight (410g) and Extreme Light (390g); heavier riders or rough roads should choose Superlight or Normal.
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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