Bola 700C 40mm Asymmetric Carbon Tubeless Rim | 28mm Wide
Bola 700C 40mm Asymmetric Carbon Tubeless Rim | 28mm Wide
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The Bola 700C 40mm asymmetric carbon tubeless rim - a 28mm-wide offset-bed Toray aero rim for climbing, all-round road and wind-exposed builds.
The climber's aero rim: the Bola 40mm asymmetric tubeless offsets the spoke bed for a stiffer, truer wheel while keeping 40mm of aero. Forty millimetres of T700/T800 carbon, 28mm wide, sold rim-only.
Buying Guide.
Weight tier - Extreme Light ~350g: the climber's aero pick - lightest end, offset bed for a stiff, true rear wheel.
Weight tier - Ultralight ~370g: the balanced middle - light enough to race, tough enough to train.
Weight tier - Superlight ~390g: the steady build - impact margin for windy training days.
Weight tier - Standard ~425g: the durable choice for heavier riders and rough roads.
Max rider weight: rated to 105kg - check rider + gear before ordering.
Same-depth series: the 40mm road/gravel rim is the wide-outer road version; the 40mm U-shape tubeless is the symmetric version.
Adjacent depth: the 35mm asymmetric climbs better; the 50mm offset tubeless adds aero.
Target Audience & Usage Notes.
Target audience.: Climbers and riders in windy terrain.
Rim-only.
Seat tubeless beads with a compressor; respect 110 psi and 105kg.
Not for flat TT maximum speed or riders over 105kg.
The Ride That Awaits.
Lace it to a climbing hub, seat a 28-32c tubeless, and feel the offset bed build a stiff, true rear wheel: 350g of rim, 40mm of aero, calm in the wind. Climb, sprint, repeat - the aero climber you are was waiting for this. Free shipping, a 3-year rim warranty and crash-replacement discount.
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- Wheelset weight (+/-2% tolerance, excluding rim tape and valves): Extreme Light 350g / Ultralight 370g / Superlight 390g / Standard 425g (+/-10-15g)
- Rim depth: 40mm
- External width: 28mm
- Internal width: 21mm hooked / 23mm hookless
- ERD: ~570mm (estimated)
- Spoke Holes: 20/20 (20/24/28/32 configurable)
- Tubeless: Tubeless-ready clincher
- Hooked/Hookless: Hooked or hookless
- Max Tire Pressure: 110 psi
- Max System Weight: 105kg
- Material: T700/T800 Toray UD carbon
- Asymmetry: Asymmetric offset spoke bed
- Brake Type: Disc or rim brake (hub-dependent)
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- Delivery vs Price: Factory-direct at $310 per rim (roughly half the cost of a single branded rim), but overseas dispatch takes 7-20 business days via FedEx/UPS/DPD Economy. Comparable Zipp 404 Firecrest ~$2,300-$1,600+ each.
- Stiffness vs Compliance: The asymmetric offset evens spoke tension for a stiffer, truer rear wheel, ideal for disc hubs.
- Weight vs Durability: 350g Extreme Light is extremely light; Standard 425g adds layup margin up to 105kg.
- Rim-only Build: Hub, spokes and tape sold separately; ERD not explicitly stated -> .
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- Fatigue Test: 750,000 cycles @640N (ISO 4210-7 Annex A, informative only)
- Impact Resistance: >40J (ISO 4210-7 reference)
- Flatness / Roundness: <0.25mm / <0.3mm (internal QC)
- Max Spoke Tension: >300kg (internal QC)
- Radial / Lateral Stiffness: 90-110 N/mm radial; >=8 N/mm lateral (internal lab)
- Dynamic Balance: <3g (internal QC)
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- Road Racing Builds: 2026 peloton standard is 28-30mm tubeless on wide rims (TdF 2026 avg ≈30mm); 40mm 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 (105kg); lighter for climbing, heavier for training and impact margin.
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- 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)
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| Bola 40mm 28mm Carbon Road Rim | - | - | - | Extreme Light 350g / Ultralight 370g / Superlight 390g / Standard 425g (+/-10-15g) | 40mm | 21mm hooked / 23mm hookless | $310 |
| Model A | - | - | - | 370-378g | 39/43mm | 32mm | $1,095 |
| Model B | - | - | - | ~420g | 45/50mm | 28.2mm | ~$1,400 |
| Model C | - | - | - | ~400g | 50mm | 28mm | ~$220 |
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What is the Bola 40mm Asymmetric Tubeless Rim and what is included?
A single bare carbon rim, sold rim-only with no hub, spokes, nipples or tape - built to your choice of components or used as a single-rim replacement.
What does asymmetric drilling do?
The spoke bed is offset toward the drive side, evening spoke tension for a stiffer, truer rear wheel.
What tyre sizes fit?
25-40mm tubeless; 28-32mm is the aero sweet spot.
Hooked or hookless?
Choose hooked (21mm, higher pressure) or hookless (23mm, more volume, ETRTO-certified tyres at 72-87 psi).
What is the ERD?
ERD not explicitly stated on the page - confirm with Bola before ordering spokes.
How long is shipping and what warranty applies?
Free shipping, VAT included in EU & USA. 3-year rim warranty against manufacturing defects with crash-replacement discount. Dispatch 1-3 business days; FedEx/UPS/DPD Economy delivers in 7-20 business days.
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