The Fastest Front Wheel Shimano Has Ever Built
Aerodynamics isn't just about riding faster.
It's about arriving fresher.
Saving watts.
Holding speed with less effort.
That's exactly why Shimano created the all-new DURA-ACE WH-R9370-C99-TL.
Developed in partnership with WorldTour riders and professional triathletes, the C99 is Shimano's deepest and most aerodynamic production front wheel ever. Hidden in plain sight throughout the 2026 Tour de France as an unbranded prototype before its official launch, it's designed to pair perfectly with the new Shimano rear disc wheel to create the ultimate race-day setup.
Now available from The Endurance Hub.
Designed For One Thing...
Maximum Speed.
The new C99 has been engineered specifically for:
- Time Trial
- Triathlon
- Ironman
- Long-distance Triathlon
- Fast, flat races
- Riders chasing every aerodynamic advantage
When average speed matters more than anything else, this is the wheel Shimano wants you riding.
WorldTour Developed
Shimano's new DURA-ACE wheel range wasn't designed solely in the wind tunnel.
It was developed alongside WorldTour riders and elite triathletes before appearing throughout the 2026 Tour de France disguised as prototype equipment.
Only after months of racing at the highest level was the wheel officially unveiled.
A Huge 99mm Aero Rim
The C99 features Shimano's deepest ever carbon rim.
At 99mm deep, it slices through the air with exceptional efficiency, dramatically reducing drag during sustained high-speed riding.
Whether you're riding a:
- Time Trial
- 10-mile TT
- 25-mile TT
- Ironman
- Half Ironman
- Fast triathlon bike leg
…the C99 has been engineered to save valuable watts throughout your effort.
Shimano's New Carbon Aero Spokes
One of the biggest advances is Shimano's newly engineered super-aero carbon spokes.
Using an advanced 5.2 x 0.8mm aero profile, they offer:
✔ Lower rotational weight
✔ Increased lateral stiffness
✔ Improved aerodynamic efficiency
✔ Faster acceleration
✔ Better steering precision
By replacing traditional steel spokes with lightweight carbon, Shimano has reduced weight while improving stiffness and aerodynamics across the new DURA-ACE range.
Wider, Faster, More Stable
Modern race bikes deserve modern wheel design.
The C99 features:
23mm Internal Width
35.2mm External Width
Optimised around today's fastest tyre sizes:
✔ 28mm
✔ 30mm
This wider profile improves:
- Aerodynamics
- Cornering stability
- Grip
- Comfort
- Rolling efficiency
Legendary Shimano Hubs
Shimano continues to use its renowned adjustable cup-and-cone bearing system, trusted by riders for decades.
The latest generation introduces:
- Improved waterproof sealing
- Replaceable Borazon-treated bearing races
- Lower bearing friction
- Optimised rotational torque under real riding loads
- Cold-forged aluminium hub shell
- Oversized 7075 alloy axle
Unlike cartridge bearings, Shimano's system remains fully adjustable and serviceable, helping ensure years of exceptionally smooth performance.
Built For Disc Brakes
The WH-R9370-C99-TL features Shimano's trusted Centre Lock rotor interface for fast installation and maximum braking performance.
Compatible with:
✔ Modern road bikes
✔ TT bikes
✔ Triathlon bikes
✔ Disc brake race bikes
Tubeless Ready
Ride with lower pressures, increased comfort and reduced rolling resistance.
The C99 is fully compatible with:
- Tubeless tyres
- Clincher tyres
Optimised for:
28-30mm tyres
Shimano Crash Replacement Programme
The new DURA-ACE C99 is covered by Shimano's Crash Replacement Programme (terms and conditions apply).
Ask The Endurance Hub for full details.
Why Buy From The Endurance Hub?
A premium wheel deserves premium support.
When you buy from us, you'll benefit from:
✔ Expert wheel advice
✔ Tyre and pressure recommendations
✔ Tubeless setup support
✔ Disc rotor fitting
✔ Compatibility checks
✔ Professional workshop installation
✔ Ongoing servicing and aftercare
We'll help you get every watt of performance from your new wheel.
Our Verdict
The C99 is a serious piece of race equipment.
Shimano has combined a deep-section 99mm rim, new carbon spoke technology and its legendary hub design to create one of the fastest front wheels ever produced.
Pair it with the new Shimano rear disc wheel and you have Shimano's ultimate aerodynamic race setup for time trial and triathlon.
If speed is your priority, the WH-R9370-C99-TL belongs at the front of your bike.
Perfect For
✔ Time Trial
✔ Triathlon
✔ Ironman
✔ Fast 10s & 25s
✔ Long Course Racing
✔ Aero Road Bikes
✔ TT Bikes
Available Now at The Endurance Hub
Experience Shimano's fastest front wheel ever.
Maximum Aero. Maximum Speed. Maximum Performance.
FAQ
Is the Shimano DURA-ACE C99 tubeless ready?
Yes. The C99 is fully tubeless compatible and optimised for modern 28mm and 30mm tyres.
What type of riding is the C99 designed for?
It's designed specifically for time trials, triathlon, Ironman and any event where maximum aerodynamic efficiency is the priority.
What makes the Shimano C99 different?
The C99 combines a 99mm deep carbon rim, Shimano's new super-aero carbon spokes and updated cup-and-cone hub system to deliver exceptional aerodynamic performance and stiffness.
Can I use the C99 with disc brakes?
Yes. It features Shimano's Centre Lock interface and is designed for modern disc brake road, TT and triathlon bikes.
Why buy from The Endurance Hub?
You'll receive expert compatibility advice, workshop fitting, tubeless setup, rotor installation and ongoing aftersales support from experienced cyclists and mechanics.