700c Tubeless Carbon Road Rim 40mm — 375-430g | Bola
700c Tubeless Carbon Road Rim 40mm — 375-430g | Bola
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The Bola 700c offset carbon tubeless road rim — a 40mm-deep, 30mm-wide all-rounder (375-430g) built for climbing, racing and endurance.
The versatile 40: a balanced V-profile that pairs aero composure with crosswind calm, offered in verified layups from 375g ultralight to 430g standard.
Buying Guide.
Weight tier - Ultralight ~375g: the climb build - for a balanced 40mm rim, choose it when hills define the ride.
Weight tier - Superlight ~395g: the race-and-training middle.
Weight tier - Standard ~430g: the Light-grade durability build for rougher training and larger riders.
Internal width - Hooked 24mm: a 27-42mm race-tire platform with rim-brake compatibility - choose it for mixed brake standards and tube options.
Internal width - Hookless 25mm: a 29-44mm comfort tubeless platform, disc only - choose it for the modern wide-tire setup.
Adjacent depth: this sits between the 35mm and 45mm road rims ($310) - shallower for crosswind calm, deeper for more aero.
Rated to a 110kg rider weight.
Target Audience & Usage Notes.
Climbing, road racing, gran fondo and training — a balanced all-rounder.
Max rider weight 110kg.
The Ride That Awaits.
Stand on the pedals and the 40mm section eats the flat, then eases into the climb without making you suffer - the all-rounder that does both. It holds a line through fast group rides and tracks cleanly on descents, tubeless-ready for modern wide tires. Choose bead, width and layup; the 3-year rim warranty keeps the miles carefree.
Specifications
- Material: Carbon fibre
- Rim depth: 40mm
- External width: 30mm
- Internal width: 24mm(hook)/25mm(hookless)
- Size: 700c
- Profile: V
- Weight Tier: standard 430g, superlight 395g, ultralight 375g
- Max Tire Pressure: 90
Trade-offs & Considerations
- Aero vs Climbing: 40mm depth balances aero gains with light weight (375-430g) – good for climbs and flats.
- Weight vs Durability: Ultralight 375g option reduces rotational mass but may be less durable than 430g standard version.
- Tire Volume vs Speed: 24mm inner width for narrower tyres (25-28mm) prioritises speed; 25mm inner width allows 25-32mm tyres for comfort.
- Crosswind vs Aero: 40mm depth offers moderate aero benefit with manageable crosswind behaviour compared to deeper rims.
Performance Test Data
- 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: 110kgs
Recommended Use Cases
- Climbing / Hill Repeats: Excellent
- Gran Fondo / Endurance: Good
- Road Racing: Good
- Sprinting / Criterium: Good
- Training / Daily Riding: Excellent
- Not Recommended For: Not recommended
Compatibility
- Frame Compatibility: Compatible with road bike frames with standard 700c wheel clearance (typically 25mm or wider tyre clearance).
- Tire Type: Tubeless or clincher (with hooked or hookless bead option)
- Tire Width Range: 27-42mm with 24mm hooked inner width, 29-44mm with 25mm hookless inner width
- Brake Standard: Rim brake (hooked) or disc brake (hookless)
How It Compares
| Model | Hub | Spoke | Bearing | Weight | Depth | Width | Price |
|---|---|---|---|---|---|---|---|
| Bola 40mm Carbon Rim | N/A | N/A | N/A | 375–430g | 40mm | 24mm(hook)/25mm(hookless) | see store |
| 303 Firecrest | N/A | N/A | N/A | ~410g | 40mm | 28mm external / 23mm internal | ~$500 |
| SES 4.5 AR | N/A | N/A | N/A | ~450g | 45mm | 30mm external / 21mm internal | ~$900 |
| CLX 40 | N/A | N/A | N/A | ~400g | 40mm | 28mm external / 21mm internal | ~$700 |
FAQ
What tubeless setup is recommended for this rim?
Use tubeless valves and sealant (20-30ml per tire). Ensure compatible tires with 24mm/25mm inner width. Maximum pressure is typically 110-120 psi for 700c road setup.
What tire widths can be used?
With 24mm inner width, use 25-28mm tires; with 25mm inner width, use 25-32mm tires. Always check tire manufacturer's minimum/maximum width range for the rim inner width.
How much weight can be saved compared to aluminum rims?
This carbon rim weighs 375-430g depending on weight tier, which is 200-300g lighter than a typical aluminum rim (around 600-700g). This reduces rotational mass and improves acceleration.
Can this rim be used for custom wheel builds?
Yes, it is designed for custom builds. Spoke hole tension exceeds 300kg, and the rim is compatible with standard spokes (e.g., DT Swiss, Pillar). Wheel builders can lace it to hubs of their choice.
How should I maintain and inspect the rim?
Regularly check for cracks, impact damage, and brake surface wear (if rim brake). For tubeless, inspect sealant level every few months. Carbon rims can be susceptible to heat damage from long descents with rim brakes; monitor brake pad temperature.
Warranty & Shipping
- Warranty Period: 3 years for rims / 2 years for wheelsets
- Warranty Coverage: Manufacturing defects on carbon structure
- Crash Replacement: 30% discount within warranty period
- Processing Time: 1–3 business days; 7–15 business days for custom or out-of-stock items
- Shipping Method: FedEx / UPS / DPD Economy (free, duties & VAT included) · Expedited option at checkout (duties & VAT payable on delivery)
- Estimated Delivery:Economy 7–20 business days · Expedited 3–7 business days, excluding customs clearance
- Packaging: Double-wall carton with foam protection
