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Bola 700C 50mm Asymmetric Carbon Tubeless Rim | 28mm Wide

Bola 700C 50mm Asymmetric Carbon Tubeless Rim | 28mm Wide

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

Size: 700C

The Bola 700C 50mm offset U-shape carbon tubeless rim - a 28mm-wide Toray aero rim for all-round road, climbing and aero builds.

The versatile aero rim: the Bola 50mm offset U-shape tubeless pairs a 50mm aero profile with a 28mm wide bed - deep enough to hold speed, light enough to climb. Fifty millimetres of T700/T800 carbon, sold rim-only.

Buying Guide.

Weight tier - Extreme Light ~370g: the all-rounder's light end - light for climbs while holding 50mm of aero.

Weight tier - Ultralight ~390g: the balanced middle - the sweet spot for most all-round racers.

Weight tier - Superlight ~430g: the sturdy build - impact margin for mixed surfaces.

Weight tier - Standard ~470g: the durable daily choice for heavier riders and rough roads.

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

Same-depth series: the 50mm road/gravel rim is the wide-outer road version; the 50mm gravel rim is the wide gravel sibling.

Adjacent depth: the 40mm asymmetric tubeless climbs better; the 55mm asymmetric tubeless goes deeper.

Target Audience & Usage Notes.

Target audience.: All-round road racers and gran fondo riders.

Rim-only.

Seat tubeless beads with a compressor; respect 110 psi and 120kg.

Not for pure climbing or aggressive gravel.

The Ride That Awaits.

Pair it with a quality hub, run a 28-32c tubeless, and the wheel simply says yes: it holds speed on the flat, climbs willingly, and calms the gusts as if they never came. Light for a 50mm aero rim - ready for everything you ask of it. Free shipping, a 3-year rim warranty and crash-replacement discount.

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: Extreme Light 370g / Ultralight 390g / Superlight 430g / Standard 470g (+/-10-15g)
Trade-offs & Considerations
Aero vs Crosswind: 50mm depth saves about 4.5W versus a 35mm rim at 40km/h; at 10° yaw the narrow 28mm outer width keeps steering predictable in gusts — the aero-to-weight sweet spot, still more sensitive than a 40mm rim.
Weight vs Stiffness: The Extreme Light tier (370g) saves about 100g versus the Standard tier (470g) at the same 50mm depth (±5g); lateral stiffness holds within 4% across tiers.
Tire-Type Trade-off: Choose the hooked bead (21mm inner, higher pressure, more tyre choice) or hookless (23mm inner, ETRTO-certified tyres at 72–87psi); tubeless needs tape, valve and sealant, clinchers mount directly.
Sourcing & Delivery Trade-off: Stock drilling ships in 1–3 business days at $310; a custom bead, 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
Aero Road Build: The 50mm asymmetric section saves about 4.5W versus a 35mm rim at 40 km/h; the narrow 28mm outer width keeps steering predictable in gusts - the aero-to-weight sweet spot.
Time Trial / Crit Build: Run 28-32mm tubeless as the aero sweet spot; the hookless 23mm bed uses ETRTO-certified tyres at 72-87 PSI, or the hooked 21mm bed for higher pressure and more tyre choice.
Custom Build / Replacement: Weights span 370g Extreme Light to 470g Standard (about 100g across tiers), ERD 538, for a bespoke or replacement aero rim.
Not Recommended For: Wide gravel - the 21/23mm bed suits 25-40mm, optimized around 28-32mm road.
Compatibility
Frame: 700C (ISO 622) road frames; disc or rim brake per hub
Tire Type: Tubeless-ready clincher
Tire Width: 25-40mm
Valve: Presta
Brake: Disc or rim brake (hub-dependent)
How It Compares
ModelWeightDepthWidthPrice
700C 50mm Rim 28mm Extreme Light 370g / Ultralight 390g / Superlight 430g / Standard 470g (+/-10-15g) 50mm 28mm See store
Corima 50G 1550g 50mm 27mm internal / 32mm external €1,640
Mavic Comete 65 1410g 65mm 25mm €1,149
Fulcrum Speed 57 DB 1480g 57mm 23mm（内宽；外宽29.3mm） €2,265
FAQ
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.
How does this deep rim handle crosswinds at speed, and is it stable on descents?
The aerodynamic profile keeps steering torque predictable at 10°–15° yaw — the rim stays planted at speed in steady-state crosswinds, with slightly more steering input in gusty conditions than a shallower rim.
What tyres can I mount on this rim, and what pressure should I run?
The 21mm hooked / 23mm hookless inner widths take tubeless tyres from 25mm to 40mm, with 28–32mm the aero sweet spot.
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 within 1 year of the original purchase date
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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