When disc brake technology started to appear on road wheels, it was natural for us to develop a compatible wheel based on our iconic Ksyrium Pro SL. But disc brakes also throw up a unique set of challenges, so it was a huge benefit to fall back on our experience designing mountain bike disc wheels. The end result is this do-it-all wheel that excels on most rides: flat or hilly, training or racing.
Shimano/SRAM | 6 bolt disc | 25c tyres
Campagnolo | 6 bolt disc | 25c tyres
Shimano/SRAM | Centre lock disc | 25c tyres
All versions are clincher, 11 speed compatible
Brilliant brake torque
The biggest difference between the two braking systems is that braking with discs displaces the brake forces from the rim to hub, moving them further away from the ground. To make its way from the hub to the ground, the braking torque is distributed through the hub, spokes and finally the lower rim. So the spoke dimensions and lacing pattern needs to be tuned accordingly.
The braking load is higher on the front wheel since the center of gravity is transferred to the front of the wheel when the bike is decelerating. Thus, the front wheel needs to be overbuilt with more spokes (20 instead of 18) and those spokes need to be crossed on each side of the wheel to make sure the brake torque will be efficiently and evenly distributed.
The lower part of the rim also undergoes higher stress than a rim brake wheel. This stress is about the equivalent of the pedalling torque so what the rear rim can withstand in traction, it can also stand when braking. The front rim however, needs to be redesigned and gets the same dimension as the rear rim, also benefitting from asymmetrical design as the disc creates asymmetry in the wheel dish.
Matching Yksion Pro tyres
To make sure all this extra stopping power reaches the ground, Ksyrium Pro Disc comes with our Yksion Pro tyres in 25mm. They offer a supple 127 TPI casing, Kevlar beads, a well-balanced rubber compound that offers the best blend of grip and rolling resistance and a weight of only 205g in 25mm.
The front wheel comes with the Griplink version that offers a specific tread pattern to evacuate water quickly when cornering, increasing confidence and speed in difficult conditions. It also offers very strong Kevlar puncture protection for added safety.
The rear wheel comes with the Powerlink version, which sports a more supple nylon puncture protection instead of Kevlar to lower rolling resistance. To reduce rolling resistance and increase speed even further, the tread pattern is optimized to reduce the pressure on the ground, while improving water evacuation from the center to increase traction and efficiency in wet conditions.
The front wheel is compatible with the three existing retention systems and can be easily converted from quick release, to 12mm or 15mm through axles using the adapters gived. The rear wheel is quick release compatible only. As for rotor mount, both wheels exist in International 6 Bolts and Center Lock.
Disc specific rim shape
Disc friendly spoke geometry and lacing
Brake torque resistant hubs, including 15 mm front compatibility
New extra light ISM 4D rims
Light and strong Zicral spokes
Isopulse lacing for superior stiffness under high lateral loads
New 25 mm Yksion Pro tyres, featuring GripLink / PowerLink concept
Proven Ksyrium reliability
Tyre 700x25: 210 grams
Pair without tyre: 1535 grams
Front without tyre: 680 grams
Rear without tyre: 855 grams
Height: 26mm, asymmetrical
Disc brake specific profile
Weight reduction: ISM 4D
Valve hole diameter: 6.5 mm
ETRTO size: 622x15C
Recommended tyre sizes: 23 to 32 mm
Shape: straight pull, bladed
Nipples: Fore integrated aluminum
Count: 20 front and rear
Lacing: front crossed 2, rear Isopulse
Front body: carbon with aluminum flanges
Rear body: aluminum
Axle material: aluminum
Adjustable sealed cartridge bearings
Freewheel: FTS-L steel
Front: Quick release, 12 thru and 15 thru compatible
Yksion Pro GripLink (front) & PowerLink (rear)
Front and Rear Tread: Single Compound
Casing: 127 TPI
Breaker: Front Kevlar, Rear nylon
Dimension: 25-622 (700x25c)
Max. Pressure: 25mm 7.7 bars - 110 PSI
In the Box:
Quick release skewer/s
- (Front wheel = 1 X QR skewer)
- (Rear wheel = 1 x QR skewer)
- (Pair = 2 x QR skewers)
Front QR adapters (supplied with purchase of front wheel or pair)
Rear QR adapters (supplied with purchase of rear wheel or pair)
Specific disc bolts
Recommended weight limit : 120kg