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MB Forging

Blue Titanium

Clutch Bell

The radiation type clutch bell has radiant design by its appearance and the support structure is lighter.  The groove design inside the bowl is the essence of the product.  This kind of groove is called "inertial groove design".  There are four 0.25mm grooves in every 1mm2 groove.  This design enables the clutch to engage smoothly for the best results.

The tornado type is about the effect of rapid heat dissipation brought about by the tornado shape.  The radiation type emphasizes the lightweight support structure and a stable clutch grip.

Both first and second generations have maximum clutch engagement to keep horsepower, accelerate more aggressively, and achieve better inertial tail speed.

MB Forging

Blue Titanium

Clutch Bell

  1. 10,000 tons of pressure under forging results in a 50% increase in material strength and density.

  2. It is not easy to conduct heat and has high temperature tolerance.

  3. CNC high-precision surface processing with precise control of production quality

  4. The heat dissipation area has increased by 80%.  The Race v1 Edition has increased eighty heat sink fins and the heat dissipation area has increased by 130%.

  5. Twenty inertial grooves enable improved rotation efficiency.

  6. The increased fine groove gap between the inside of the clutch bell and the clutch contact surface maximizes friction area.

  7. Precision CNC rounded surface with a tolerance of less than 0.02mm.

  8. Tornado Standard Edition - twenty inertial geometry groove design.  suitable for urban riding.

  9. Tornado Tournament Edition - extremely lightweight design.  Eighty heat sink fins have been added to the existing twenty inertial geometric grooves to have better heat dissipation effect.

  10. Radiation Standard Edition - radiant design on the exterior, 20 inertial geometric grooves, creating a support structure that is more stable and rigid, and the product is lighter.

  11. New patent: M507470

Basic introduction of the MB Forging Blue Titanium Clutch Bell and the MB clutch

I believe many people have heard of the MB Forging Blue Titanium Clutch Bell.  Many of my friends often ask: what the differences among the various editions are and which one is better for me to use?

What are the characteristics and differences of the various editions of MB Forging Blue Titanium Clutch Bell?  Now let me briefly introduce them to you.

The titanium clutch bell is designed with a tornado style hollow design and the heat dissipation effect is unquestionable.  The body of the bell housing is made of super alloy forging which is more durable than the traditional cast product. The whole series is titanium-plated and can withstand higher temperatures without reducing its effectiveness.

Tornado Type have four editions. They are the Standard Edition, the Race v1 Edition, the Hill Edition, and the Race v2 Edition.

The Standard Edition has a twenty grooved design.  It is suitable for flat ground use like commuting and long-distance riding.

The lightened Standard Edition is our Race v1 Edition.  In addition to 20 grooves, it also adds 80 heat sink fins.  If you are a more enthusiastic rider, need to start faster and pay attention to lighter weight components, then this edition is for you.

The Hill Edition has 10 grooves for mountain road ride requirements of larger torque.  The weight of the Mountain Path Edition is the heaviest. If you spend more than half of your time on the mountain road every day, I suggest you choose this edition.

Finally, there is the Race v2 Edition which is made using the Hill Edition with enhanced heat dissipation.  In addition to 10 grooves, it also adds 40 effective heat sink fins. It is suitable for long period riding on mountain roads.  It also provides strength to start off with full acceleration.

There are also some riders asking: where the green clutch and the yellow clutch should be used and what kind of clutch should one choose?  The difference between the green edition clutch and the yellow edition of the clutch is in the clutch shoe.  The two clutches are made of composite material without asbestos. Generally speaking, the green edition is suitable for general riding conditions, while the yellow edition of the clutch shoe is made of a metal sintered material, that allows the clutch to be engaged for a shorter period of time and withstands more horsepower.  If you have modified the cylinder to create greater horsepower, or if you are used to vigorously boosting the throttle and braking heavily when riding, then the vehicle requires a yellow edition of the clutch to increase the bite force.

The above is a brief introduction to the differences between the various editions of the MB Forging Blue Titanium Clutch Bell and the MB clutch.  May this aid in your choice of a suitable product.

​​​MB Black POWER Forged Titanium Bell Clutch Housing

(Clutch Cover) Product Description

MotorBrother (MB) is first in the motorcycle industry to use forged alloy materials to make a bell clutch housing with titanium plating, so that the durability of the bell clutch housing is greatly enhanced by material strengthening.  Through our titanium plating treatment, the product is more resistant to high temperatures that has vastly improved friction stability to the clutch and bell clutch housing.  Our design incorporates heat sink fins which directly expands the heat radiation area helping the bell clutch housing to quickly dissipate heat. Twenty geometric inertial grooves are designed into the bell clutch housing to transfer the center of gravity to the raised edges of the bell clutch housing.  They increase the inertial rotation efficiency and eliminate the chance of the clutch cover disintegrating.

The CNC machined and rounded MB Black POWER Forged Titanium Bell Clutch Housing (clutch cover) has a true roundness error that is controlled at ± 0.02mm.  It greatly reduces the power loss caused by the bell clutch housing yaw and ensures that all original power is retained.

MB Black POWER Forged Titanium Bell Clutch Housing (clutch cover) is cast from forged alloy steel with higher strength and density, which is then processed with CNC high precision.  A CNC manufactured product can have the weight and precision controlled more accurately leading to a consistent quality outcome.

In order to make the power transmission smoother and increase the friction, a small gap in the internal friction surface of the bell clutch housing is added to have four 0.25mm grooves in the area of 1mm2 achieving the maximum clutch and bell clutch housing contact area.

The bell clutch housing generally is not engaged with the clutch at low rpm which will increase the time taken to throttle and cause the engine idling. MB Black POWER Forged Titanium Bell Clutch Housing (clutch cover) is specially designed with twenty geometric inertial grooves to improve this aspect.  These grooves shift the center of gravity to the raised edge of the bell clutch housing increasing the inertial rotation efficiency and slowing down the rpm at low speeds of the vehicle.  Thus, the loss in power transmission is greatly reduced.

The bell clutch housing and the clutch are engaged through friction.  The usual constant urban riding of stopping and starting causes the temperature of the bell clutch housing to rise.  When the temperature rises, there is a problem of material fatigue leading to performance loss.

With this in mind, MB takes the problem of heat dissipation into account when designing the product.  Our design incorporates a tornado type pattern into the rotating bevel that enables the product itself to dissipate heat when it rotates.  As it rotates, the air flow increases to let the product cool better.  Moreover, the increase of the bell clutch housing fins directly increases the heat radiation area which helps the bell clutch housing to quickly dissipate heat. The tornado style has nine support points to release the force to the bell clutch housing body itself.

MB has also designed a Radiation Edition with the goal to be more lightweight.  The radiation shape maximizes the area that can be reduced.  The structure of the product is more robust with fourteen support points.

The product obtained a new patent of the Republic of China, patent number: M507470.

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