BladeX SDM Hub Technology


Strength & Durability Maximized Geometry, Built-in Ceramic Bearings

Detailed Specs

Weight: 70g 236g
Center to L/R Flange: 40.5mm / 40.5mm 35.5mm / 16.3mm
Flange Diameter L/R: 30mm / 30mm 37mm / 90mm
Bearings: 2 Ceramic Bearings 5 Ceramic Bearings


Lateral Stiffness

When you start using your bike to sprint and climb, lateral stiffness becomes one of the most important parameters controlling your wheels’ performance. Poor lateral stiffness means that there’s more strain rubbing away your brake pads as you ride, your pedaling power isn’t transferring to your wheels efficiently, forcing you to work harder and wear out your bike’s hardware sooner just to finish your ride. How do we maximize the lateral stiffness in our wheelsets? Check out the figure below:

The formula that determines a wheel’s lateral stiffness is D = W/L. D refers to the lateral stiffness in your wheels, while W is the distance from hub center to right flange and L is the length of the drive side spoke. The design of BladeX ULTIMATE’s rear hub extends the W to the maximum distance possible for a road bike system, and it’s oversized right flange (90mm in diameter) shortens the spokes’ length by 9mm. So, from the aspect of geometry, with its optimized W and L, a wheel with the ULTIMATE hub is stiffer than a wheel with a DT Swiss 240 hub.

Torsional Stiffness

We use an oversized, 90 mm flange for the BladeX SDM’s rear hub, which results in 118% more torsional stiffness than the competing DT Swiss 240S can offer. With optimized torsional stiffness, the power from your pedaling goes more directly to your wheels. You’ll enjoy noticeably quick and responsive acceleration, along with improved your climbing and sprinting. Simply put, you don’t feel like anything’s dragging on your bike and trying to hold you back when you’re climbing and riding with this much power.


Durable Cassette Body

Currently, there are two materials used for cassette body making: steel and a lighter alloy blend. The alloy reduces your bike’s overall weight, but it’s not as strong as steel, so it gets worn and “bitten” by the cassette over time. To make the rear hub both light and strong, we use the alloy to make most of the cassette body, but we reinforce it with 8 steel bars. The 8 bars are screwed to cassette body, and they stay in direct contact with the cassette, protecting it from everyday damage.

Durable Bearings

When you ride, every ounce of impact that your bike’s wheels take leads to the hub, which may deform, dislodge, and  too, and reducing bearing balls’  life. We use a Reinforced Ring to prevent the ball bearing from getting deformed or dislocated by impact, making each wheel more resilient.


Ceramic Bearings Integrated

Hybrid Ceramic Bearings

How fast of a bicycle is most determined by the performance of its revolving components, wheels are the main revolving components of a bicycle. This makes it reasonable to upgrade the wheels with Ceramic bearings. There are 2 main advantages of using Ceramic Bearings:

  1. Ceramic Ball is closer to perfect round: A steel ball in Grade G25 is meant to be a high quality ball in this material, if measured by size, it’s precision is 25/1,000,000 inch. Nevertheless, a ceramic ball can be made to  Grade G5, it’s precision is much higher than the best steel ball. That’s why we say Ceramic Ball is closer to perfect round.
  2. Ceramic Ball is stiffer: Stiffness is very important to a ball used in a bike, it’s also called “Modulus of Elasticity”. A steel ball’s Modulus of Elasticity is around 30,000,000Pounds/Inch, while a ceramic ball’s is 47,000,000Pounds/Inch. Both of the main features make the bearing with ceramic balls smooth, easy to maintain and fit for all conditions. Also upgrading to ceramic bearing brings a lot of benefits over the steel counterparts:
Features Benefits
Higher hardness of rolling element
– Better wearability
– Greater durability
– Longer service life
Lower gravity
– Lightweighting the system
– Lower centrifugal force during rotation, consequently less bearing wear and heat generation and bearings can run at higher speed
Higher stiffness
– Increase the rigidity of system
– Less sphere deformation under load and this will transfer energy better
Higher precision and better surface finish of ceramic balls
– Less friction between ceramic balls and races
– Less wear
– Less maintenance or maintenance free
– Races will not block due to rusty
Magnetism free
– Less magnetic contaminations to be magnetized into the raceway that can affect smooth rotation and destroy the raceway
Electrical isolation
– No galvanically stimulated corrosion
– Can be used in application that requires electrical isolation