Overfast Ultralight Carbon Wheelset (37 / 50) — Center Lock • Carbon Spokes
The Overfast Ultralight Wheelset is engineered with a safety-first approach: low weight achieved through materials control and manufacturing precision—not reduced safety margins. Choose 37 mm or 50 mm rim depth. Both configurations use a modern 23 mm internal hooked-bead rim, carbon spokes, and a validated hub system with TPI ceramic bearings. Built for fast acceleration, stable handling, and real-world durability, backed by a 2-year warranty.
Spec Snapshot:
37/50 mm depth • 23 mm internal (hooked) •
968 g / 1016 g (±15) g •
100 kg rider limit • Center Lock • Shimano 11/12s or SRAM XDR
Overfast Ultralight Wheelset — Features & Benefits
- Pick Your Depth: 37 mm for all-round responsiveness or 50 mm for more aerodynamic efficiency.
- Modern Wide Rim: 23 mm internal hooked-bead profile for stable tyre shaping and confident road handling.
- Carbon Spokes (Serviceable): low weight with a proven system designed for durability and long-term ownership.
- Center Lock Hubs: clean rotor interface with broad rotor compatibility.
- TPI Ceramic Bearings: smooth rolling and reduced friction under load.
- Conservative 1:1 Build: stable tension and predictable behavior over sustained use.
Safety & Validation — Built Beyond Standard Requirements
Impact Resistance
- UCI impact requirement: 40 J
- Overfast validation: passed 100 J impact testing (≈ 2.5× margin)
- Added confidence against real-world debris and unexpected impacts.
Fatigue & Stiffness Testing
- Passed standard fatigue testing.
- UV-shaped rim profile + optimized carbon layup for lateral stiffness with controlled compliance.
Carbon & Manufacturing Process
- Rims are manufactured in-house at an equity-owned composite facility (not outsourced OEM).
- Top-grade fibers including Toray T1100 and T800 (or higher).
- Laser-guided layup positioning for millimeter-level consistency and efficient material use.
- Lead engineers with 20+ years high-end composite layup experience.
Spokes, Hubs & Wheel Build Philosophy
- Carbon spokes: low weight, durable, and designed for serviceability/repairability.
- Hub platform: refined over 2+ years, athlete-tested, and validated through fatigue and impact testing.
- Bearings: TPI ceramic bearings.
- Brake interface: Center Lock.
- Lacing: conservative 1:1 for stability and long-term reliability.
Warranty: 2 years. Claims are managed responsibly.
Overfast Ultralight Wheelset — Specifications
Rims & Tyres
- Wheel Size: 700C
- Bead Type: Hooked bead
- Internal Width: 23 mm
- Depth Options: 37 mm or 50 mm
- External Width: 37 mm = 28 mm • 50 mm = 29 mm
- Drilling: 20H front / 20H rear
- Max Tyre Pressure (28c): 110 psi
- Tyre sizing guidance: Overfast does not publish a specific maximum tyre size. Follow tyre manufacturer guidance for fitment and pressure and do not exceed stated wheelset pressure limits.
Hubs & Spokes
- Hubs: Overfast hubs • Center Lock
- Bearings: TPI ceramic
- Spokes: Overfast carbon spokes (3.5–1.5)
- Lacing: 1:1 configuration
- Axles: 12×100 (F) / 12×142 (R)
- Freehub: Shimano 11/12s • SRAM XDR
Weights & Limits
- Rider Weight Limit: 100 kg
- 37 mm Wheelset Weight: 968 g (±15) g • Front ≈ 432 g • Rear ≈ 536 g • Rim ≈ 279 g
- 50 mm Wheelset Weight: 1016 g (±15) g • Front ≈ 462 g • Rear ≈ 554 g • Rim ≈ 330 g
Overfast Ultralight — Rim Depth Comparison
| Spec | Ultralight 37 | Ultralight 50 |
|---|---|---|
| Rim Depth | 37 mm | 50 mm |
| External Width | 28 mm | 29 mm |
| Internal Width | 23 mm | |
| Bead | Hooked bead | |
| Drilling | 20H front / 20H rear | |
| Max Pressure (28c) | 110 psi | |
| Brake Interface | Center Lock | |
| Axles | 12×100 (F) / 12×142 (R) | |
| Freehub | Shimano 11/12s • SRAM XDR | |
| Spokes | Overfast carbon spokes (3.5–1.5) • 1:1 build | |
| Approx. Weight (pair) | 968 g (±15) | 1016 g (±15) |
| Rim Weight (each) | ≈ 279 g | ≈ 330 g |
| Rider Limit | 100 kg | |
All weights are manufacturer-claimed and may vary by finish and freehub body.
Helpful Links
Browse our wheelsets and components.
Learn more about the Center Lock rotor installation and removal procedure and always install rotors using manufacturer torque specifications.
Overfast Ultralight Carbon Wheelset — FAQ
How fast does it ship?
Orders ship once processing is complete and a tracking number is generated. Delivery time depends on destination. If you want an ETA before ordering, message us with your location and the product you’re considering.
Do prices include duties and taxes?
Shipping and duty handling can vary by destination and product type. If DDP (Delivered Duties Paid) is offered for your destination, duties and import handling are included at checkout for eligible orders. If DDP is not available, duties and taxes may be collected by the carrier or local customs authority.
What is the warranty?
This wheelset includes a 2-year manufacturer warranty. If an issue occurs, Underdogs Cycling will guide you through the claims process and coordinate with the manufacturer where applicable.
How do I confirm compatibility before ordering?
Compatibility depends on axle standard, brake interface, and drivetrain/freehub type. If you’re unsure, send us your bike model/year and your drivetrain (Shimano vs SRAM) and we’ll help confirm fit.
Is the Overfast Ultralight Wheelset safe for real-world riding?
Yes. The rim structure is validated beyond standard requirements, including 100 J impact testing (UCI requirement is 40 J), plus fatigue testing and an optimized carbon layup for stiffness and durability.
What tyre size should I use with the 23 mm internal rim?
Overfast does not publish a specific maximum tyre size for this wheelset. Follow tyre manufacturer guidance for fitment and pressure, and do not exceed the stated wheelset pressure limit of 110 psi on 28c.
Are carbon spokes serviceable?
Yes. The carbon spoke system is designed for durability and long-term ownership, including serviceability and repairability.
Which depth should I choose: 37 mm or 50 mm?
Choose 37 mm if you want the lightest, most responsive all-round feel. Choose 50 mm if you want a more aerodynamic option while staying exceptionally light.
Is the hub interface Center Lock?
Yes. This wheelset uses Center Lock hubs.
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