BOLA 700c Carbon Tubular Road Rim | 50mm Deep, 25mm Wide, 355g
BOLA 700c Carbon Tubular Road Rim | 50mm Deep, 25mm Wide, 355g
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The Bola 700c U-shape carbon tubular rim — a 50mm-deep, 25mm-wide featherweight (355g) built for glued tubular road racing and crits.
For race day and the glued tire: a 50mm aero profile on a 25mm outer, at a feather 355g — built for criteriums, road races and time trials where every watt counts.
Buying Guide.
Weight tier - Superlight ~355g: a single-tier Ultralight race build - the lightest way to run a deep aero section, for criteriums, road races and time trials where watts are everything.
Tire choice: glued tubulars only (25-28mm optimum) - accept the gluing ritual for a lighter, suppler race tire; this is not a tubeless or everyday wheel.
Adjacent depth: the 35mm tubular (~295g, $310) is the lighter, shallower climbing tubular; the 60mm tubular ($310) goes deeper for flat-course speed.
Rated to a 120kg system weight; manage heat on long descents behind a rim-brake caliper.
Target Audience & Usage Notes.
Road racers, crit riders, tri/TT.
Max system weight 120kg (spec); not for tubeless convenience or everyday commuting.
The Ride That Awaits.
Glue the tire, roll to the line, and let the deep section do the work - it holds speed on the flat like it is being pulled by a magnet, yet climbs surprisingly well for its depth. Criteriums and time trials reward every saved watt, the light rim answering every surge. Build a featherweight 50mm tubular wheelset; a 3-year rim warranty has you covered on race day.
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- Material: Toray UD Carbon
- Rim depth: 50mm
- External width: 25mm
- Internal width: N/A
- Size: 700c
- Profile: U-shape
- Weight Tier: Superlight 355g
- Max Tire Pressure: 90
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- Aero vs Climbing: The 50mm depth provides significant aerodynamic gains at speed, but adds weight compared to shallower rims. At 355g, this rim is exceptionally light for its depth, offering aero benefits without excessive climbing penalty.
- Stiffness vs Compliance: Deep-section rims are laterally stiff for power transfer, but can transmit road vibrations. The 25mm outer width allows modern 25-28mm tubulars to run at lower pressures, improving comfort and grip without sacrificing aero efficiency.
- Tire Volume vs Speed: The 25mm width optimizes 25-28mm tubular tires, which offer lower rolling resistance and better cornering grip, but slightly wider tires create more drag than narrower ones. This trade-off favors race-day speed and control over pure aero on smooth tracks.
- Weight vs Durability: The superlight 355g build reduces rotational mass for faster accelerations, but lighter weight can compromise impact resistance. Bola's tested >40J impact resistance and >100kg ultimate strength ensure durability comparable to heavier rims, though riders on rough roads may prefer the standard 370g option for extra peace of mind.
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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: Excellent
- Triathlon / TT: Excellent
- Road Racing: Excellent
- Gran Fondo / Endurance: Good
- Climbing / Hill Repeats: Suitable
- Not Recommended For: Not recommended
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- Frame Compatibility: 700c road frames with rim brakes
- Tire Type: Tubular (glued/sewn-on)
- Tire Width Range: 25-36mm recommended (optimized for 25mm outer width)
- Brake Standard: Rim brake (caliper)
- Drivetrain: Compatible with standard road drivetrains (Shimano/SRAM/Campagnolo)
- Rotor Standard: N/A (rim brake)
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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 |
|---|---|---|---|---|---|---|---|
| Tubular 50 | N/A | N/A | N/A | 355g | 50mm | N/A | see store |
| SES 5.6 | N/A | N/A | N/A | ~400g | 56mm | 27mm | ~$2500 |
| 404 | N/A | N/A | N/A | ~420g | 58mm | 26mm | ~$2000 |
| CLX 50 | N/A | N/A | N/A | ~350g | 50mm | 27mm | ~$1800 |
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Is this rim tubeless-ready?
No, this is a tubular rim designed for glued/sewn-on tubular tires. It does not support tubeless clincher tires. For tubeless setup, you would need a clincher or tubeless-compatible rim, but this rim's low weight and race-focused design are optimized for tubulars.
What tire sizes are compatible with this rim?
The rim is optimized for 25-28mm tubular tires, and its 25mm outer width improves the aerodynamic transition and tire shape for modern tubular tires. You can run pressures up to 125 psi, but lower pressures are possible with wider tires for increased comfort without losing speed.
How much weight can I save compared to a clincher rim?
The Superlight option weighs approximately 355g per rim, while typical carbon clincher rims of similar depth often weigh 450-500g. This can save up to 100g or more per rim, reducing rotational mass and improving acceleration and climbing efficiency.
Can I customize the valve hole size for my build?
Yes, the rim comes with a standard 6.5mm valve hole, but customization options are available to meet OEM or team requirements. You can request different valve hole sizes when ordering, ensuring compatibility with your preferred tubular valve stems.
What maintenance and inspection are required?
Regularly inspect the rim for impact damage, delamination, or brake heat signs. Check spoke tension to ensure it remains above 280kg, and maintain the rim's dynamic balance below 3g. Follow manufacturer guidelines for gluing tubular tires and periodically check for any structural issues, especially after hard rides or crashes.
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