700C 50mm Carbon Road Rim 34mm 28mm Inner Tubeless Disc | Bola
700C 50mm Carbon Road Rim 34mm 28mm Inner Tubeless Disc | Bola
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The Bola 700C 50mm carbon road rim - a 50mm U-shaped hooked disc rim, 34mm outer / 28mm internal, 370-445g, for wide-tire aero road and all-road builds.
A 50mm aero section wearing a wide, modern bed - built for the rider who refuses to choose between speed and 32mm tyre comfort.
Buying Guide.
Weight tier - light ~370g (Ultralight): for aero-all-road riders who climb and accelerate, wanting wide-tyre comfort.
Weight tier - upper ~445g (Light/Midweight): for rougher roads and heavier riders, adding impact margin.
Internal width - 28mm: 30-40mm at ~50-75 PSI for aero-all-road, 40-45mm at ~40-60 PSI for rough mixed surfaces.
Same-depth series: the 50mm 23mm UV rim ($310) is the narrow-bed speed option; the 50mm asym 36mm rim ($320) runs even wider.
Adjacent depth: the 45mm 34/28mm rim ($310) is lighter and crosswind-calmer.
Disc builds only; respect the system weight limit.
Target Audience & Usage Notes.
aero-all-road racers, gran fondo riders and wheel builders.
Disc-brake frames only; 20/20 drilling, customisable drilling. 120kg rider limit.
Use 30mm rim tape for tubeless.
The Ride That Awaits.
Built with a 32mm tubeless tyre it feels fast on the flat yet ably relaxed over rough all-road surfaces - wide enough to comfort you, deep enough to carry you.
You arrive faster and less spent.
Free shipping and a 3-year rim warranty support the build.
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- Material: carbon fiber
- Rim depth: 50mm
- External width: 34mm
- Internal width: 28mm
- Size: 700c
- Profile: U-shaped
- Weight Tier: 370-445g
- Max Tire Pressure: 90
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- Aero vs Climbing: The 50mm profile and 34mm outer width reduce drag but add approximately 50-100g over a 45mm rim. Riders prioritizing low weight for climbs may prefer lighter shallower options.
- Stiffness vs Compliance: High-modulus carbon construction ensures lateral stiffness (≥8N/mm) for sprinting, but the U-shaped hooked profile and 28mm inner width provide some vertical compliance to absorb road buzz without sacrificing power transfer.
- Tire Volume vs Speed: The 28mm internal width supports 25-32mm tires, optimized for 28mm; wider tires increase comfort and grip but slightly increase rolling resistance and aerodynamic drag at higher speeds.
- Weight vs Durability: Available layups range from 370g to 445g; lighter options save ~75g per rim but may have slightly reduced impact resistance, while heavier options offer more robust fatigue life (verified >300kg compressive strength).
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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: <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: 120kgs
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- Sprinting / Criterium: Good. Stiffness and aero help in sprints, but weight may be a factor for punchy climbs.
- Triathlon / TT: Excellent. 50mm depth provides significant aero advantage at sustained speeds.
- Road Racing: Good. Balanced aero and stiffness, suitable for race days.
- Gran Fondo / Endurance: Good. Wide tire compatibility and tubeless ready enhance comfort on long rides.
- Climbing / Hill Repeats: Not recommended. Weight (370-445g) is heavier than dedicated climbing rims; shallower profiles are lighter.
- Not Recommended For: Not recommended for extreme off-road or heavy gravel; designed for road and light gravel.
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- Frame Compatibility: 700c disc brake road and light gravel frames
- Tire Type: Tubeless or clincher
- Tire Width Range: 33-48mm
- Brake Standard: Disc brake
- Drivetrain: N/A
- Rotor Standard: N/A(rim only)
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| Translation missing: en.product.metafields.model | Translation missing: en.product.metafields.hub | Translation missing: en.product.metafields.spoke | Translation missing: en.product.metafields.bearing | Translation missing: en.product.metafields.weight | Translation missing: en.product.metafields.depth | Translation missing: en.product.metafields.width | Translation missing: en.product.metafields.price |
|---|---|---|---|---|---|---|---|
| Bola 700c Carbon Road Rim | N/A | N/A | N/A | 370-445g | 50mm | 28mm | see store |
| SES 4.5 AR | N/A | N/A | N/A | ~515g | 50mm | 30mm | ~$1000 |
| 505 | N/A | N/A | N/A | ~450g | 50mm | 28mm | ~$800 |
| CLX 50 | N/A | N/A | N/A | ~450g | 50mm | 30mm | ~$750 |
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What tire sizes are compatible with this rim?
The 28mm inner width supports tires from 25-32mm, optimized for 28mm. Modern wider road tires (28-30mm) pair well with the 34mm external width for optimal aero and comfort. Clincher and tubeless tires are both compatible.
How do I set up tubeless on this rim?
Use 30mm rim tape specifically for tubeless to ensure a reliable seal. Install the tire, add sealant, and inflate to seating pressure. The rim's hooked profile and 28mm inner width provide secure bead retention. Maximum pressure is 125 psi, but typical road pressures are 80-100 psi for 28mm tires.
What is the weight and how does it affect performance?
The rim weight ranges from 370g to 445g depending on the layup grade. Lighter rims reduce rotational weight, improving acceleration and climbing, while heavier options offer more robust durability and impact resistance. Choose based on your priority: climbing vs all-round performance.
Can I customize the rim for my build?
Yes, valve hole size (default 6.5mm), spoke hole diameter (default 4.5mm), and nipple angle (front 7°, rear 5° or 7°) can be adjusted. This allows wheelbuilders and OEMs to match specific hub and spoke requirements. Custom layup options are also available for weight vs strength trade-offs.
What maintenance is required for carbon rims?
Regularly inspect the rim for cracks, delamination, or impact damage. Clean with mild soap and water; avoid harsh chemicals. Check spoke tension periodically. Avoid overheating (e.g., prolonged braking) as it can degrade the resin. The rim's fatigue-tested construction (750,000 cycles) ensures durability under normal use.
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