Bola 700C 35mm Carbon Tubeless Rim | 25mm Wide Road Gravel XC

• Material: Carbon fiber
• Rim depth: 35mm
• External width: 25mm
• Internal width: 18mm
• Size: 700C / ISO 622
• Profile: U-shaped, low profile
• Weight Tier: Superlight (365±15g) / Standard (400±15g)
• Max Tire Pressure: 125

• Aero vs Weight: This 35mm low-profile rim prioritizes weight savings and crosswind stability over aerodynamic drag reduction. At 365±15g superlight, it offers a significant weight advantage over deeper aero rims (e.g., 50mm rims typically weigh 450-500g), but has 10-20% higher drag at 40km/h.
• Stiffness vs Compliance: The unidirectional carbon construction provides adequate stiffness for power transfer, but the 35mm depth and 18mm inner width allow for some vertical compliance, improving ride comfort on rough roads. Lateral stiffness is moderate, rated at ≥8N/mm for the rim.
• Tire Volume vs Speed: The 25mm outer and 18mm inner width (20mm optional) optimally support wider tires (25-32mm) for lower rolling resistance and better traction, but the low profile may have slightly higher aerodynamic drag compared to deeper rims. This trade-off favors versatility over pure speed.
• Weight vs Durability: The superlight variant (365±15g) reduces rotational mass for faster climbing but may be more susceptible to impact damage than heavier, more robust rims. The standard variant (400±15g) offers a balance, with reinforced sidewalls and a 3-year warranty.

• 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: 105kgs

• Climbing / Hill Repeats: Excellent – low weight (365±15g) aids acceleration.
• Gran Fondo / Endurance: Good – compliant and stable for long rides.
• Road Racing: Good – lightweight and responsive, but not as aero as deeper rims.
• Sprinting / Criterium: Suitable – stiff enough for sprints, but low profile may not offer aero advantage.
• Training / Daily Riding: Excellent – durable and tubeless-ready for daily use.
• Not Recommended For: Deep aero racing where maximum aerodynamic efficiency is needed, or heavy downhill riding.

• Frame Compatibility: Road hardtail frames accepting 700C rims,QR 130mm
• Tire Type: Tubeless-ready (hooked and hookless)
• Tire Width Range: 21-30mm
• Brake Standard: Rim brake
• Drivetrain: Compatible with all drivetrains (frame dependent)
• Rotor Standard: Requires hub with rotor mount (6-bolt or centerlock)

What tire sizes are compatible with this rim?

The rim has an internal width of 18mm (or 20mm optional) and an external width of 25mm, designed for tires from 25mm to 32mm width. For best performance, we recommend 28mm tires for road use and 32mm for gravel. The rim is ETRTO compliant and supports tubeless setups. Tire pressure typically ranges from 60-90 psi for 25mm tires, but always follow the tire manufacturer's recommendations.

How do I set up tubeless tires on this rim?

First, ensure the rim and tire are clean. Apply tubeless tape to the rim bed, covering the spoke holes. Install the tubeless valve and mount the tire, then use a compressor or high-volume pump to seat the bead. Inflate to the recommended pressure and check for leaks with soapy water. The rim is designed for both hooked and hookless systems, so follow the specific pressure limits for your tire.

What are the weight savings compared to a typical aluminum rim?

This carbon rim weighs approximately 365±15g in the superlight variant, which is about 150-200g lighter than a comparable aluminum rim of similar dimensions (typically 500-600g). This weight reduction is especially beneficial for climbing and acceleration, reducing rotational mass.

Can this rim be used for a custom wheel build? What hubs and spokes are recommended?

Yes, this rim is designed for custom builds. To achieve a sub-1500g wheelset, pair it with lightweight hubs (e.g., DT Swiss 240, Bitex, or Tune) and spokes like Sapim CX-Ray or Pillar 1420. The rim has a spoke hole count compatible with standard 24/28/32 hole hubs. Ensure the spoke tension is within the recommended range (max >300kg).

How should I maintain and inspect the carbon rim to prevent damage?

Regularly inspect the rim for cracks, delamination, or impact damage, especially after hard rides or crashes. Clean with mild soap and water, avoiding harsh chemicals. Check spoke tension periodically. Carbon rims can be susceptible to heat damage from brake pads, so for rim brakes, use appropriate pads; however, this rim is disc-brake only. Also, avoid overtightening the tire pressure beyond the maximum limit.

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