• BOLA 120mm Aero Carbon Rim 700C – Hooked Tubeless, 28mm Wide, Time Trial & Triathlon Bola
1 2

Bola 700C 120mm Deep Aero Carbon Tubeless Rim | 28mm Wide TT Triathlon

Bola 700C 120mm Deep Aero Carbon Tubeless Rim | 28mm Wide TT Triathlon

$420.00 USD
$420.00 USD
Sale Sold out
Free shipping  |  VAT included in EU & USA
Weave
Spoke QTY
Weight

The Bola 120mm deep aero carbon rim - a 120mm UV-profile TT/triathlon rim, 28mm outer / 21.5mm internal, ~655g, hooked tubeless, for rear-wheel aero builds.

A 120mm blade of carbon poised between the reasonable and the extreme - deep enough to dominate a flat course, light enough to remain, by deep-section standards, almost nimble.

Buying Guide.

Use case: a deep rear rim for flat to rolling TT and triathlon, more manageable than the 180mm option.

Course judgement: choose it over shallower rims for sustained flat speed; it still favours wind-protected courses over climbs.

Tyre choice: run 25-28mm high-pressure race tyres on the narrow internal bed.

Same-depth series: the 180mm aero rim ($450) goes deeper for flat speed; the 90/95mm wave rim ($350) is wavier and calmer.

Adjacent depth: the 88mm hooked tubeless rim ($350) is a classic deep spoked choice below it.

Rear wheel only; respect the system weight limit.

Target Audience & Usage Notes.

TT/triathlon rear-wheel builds.

Rear wheel on flat to rolling courses; 25-28mm tubeless/clincher, up to 125 PSI.

Rider limit 125kg per product family.

Not for gravel, climbs, technical descents or very windy conditions.

The Ride That Awaits.

Built as a rear wheel, it holds a strong, steady aero line; the narrow bed lets a race tyre run thin and fast, the miles dropping away behind you.

You are the shape of speed.

Free shipping and a 3-year rim warranty round out the build.

Specifications
Size: 700c
Material: Genius Toray carbon fiber
Rim Depth: 120mm
Bead Type: Hooked
Inner Width: 21.5mm
Outer Width: 28mm
ERD (Effective Rim Diameter): 398mm
Weight Tier: 655g
Trade-offs & Considerations
Aero vs Crosswind: A 120mm section saves about 12.0W over a 50mm rim at 40km/h on a flat time trial, but at 10° yaw the tall profile demands careful steering in crosswinds — best reserved for sheltered TT and triathlon use.
Weight vs Stiffness: At 655g the deep section adds roughly 200g over a 50mm rim (±5g); the layup is tuned for straight-line aero and tracking, not climbing, so rotational mass is the price of the gain.
Tire-Type Trade-off: The hooked bead mounts 25–28c tubeless tires on the 21.5mm internal bed; 25c is the fastest aero choice while 28c adds comfort and grip.
Sourcing & Delivery Trade-off: Stock drilling ships in 1–3 business days at $420; a custom spoke 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: 90–110 N/mm (internal lab)
Lateral Stiffness: ≥8N/mm
Max System Weight: N/A
Recommended Use Cases
Sprinting / Criterium: Good for sprinting on flat circuits, but less agile in corners.
Triathlon / TT: Excellent for time trials and triathlons on flat courses.
Road Racing: Good for flat and rolling race stages.
Gran Fondo / Endurance: Not recommended due to weight and wind sensitivity.
Climbing / Hill Repeats: Not recommended.
Not Recommended For: Gravel, steep climbs, technical descents, and extremely windy conditions.
Compatibility
Frame Compatibility: 700c road bikes with disc brake mounts
Tire Type: Tubeless-ready clincher (also compatible with standard clincher tires)
Tire Width Range: 25mm - 28mm
Brake Standard: Disc brake only
Drivetrain: All standard drivetrains (Shimano, SRAM, Campagnolo) depending on hub
Rotor Standard: 6-bolt or CenterLock (depends on hub)
How It Compares
ModelWeightDepthWidthPrice
700C 120mm Rim 28mm 655g 120mm 28mm See store
Model A ~430g 50mm 28mm $1,399
Model B ~430g 50mm 27mm $249
Model C ~420g 50mm 30mm $389
FAQ
Do I get a bare rim here, or is it built up with a hub and spokes?
It's a bare carbon rim — no hub, spokes or nipples. Take it to any wheel builder to lace it to your own hub; we can also supply a built wheel on request.
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 spoke tension can I safely build to — will the holes pull out of the carbon?
Drive-side / disc-side maximum tension is 130–140 kgf, with the non-drive side adapted to match; the spoke holes are locally reinforced inside the carbon layup to prevent pull-out cracking.
How does a deep aero rim handle crosswinds — will it tug the steering on fast descents?
An optimised aero profile keeps steering torque predictable at 10°–15° yaw, so high-speed descents stay planted and controlled.
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, and 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
View full details