Leading through Innovation: ENDURANCE LITE CONCEPT (ELC)

For a long time, STW (stiffness-to-weight) was deemed the absolute requirement for the development of new frames. We at BULLS know that this alone is not enough. Since 2010 we have been developing frames according to the ENDURANCE LITE CONCEPT (ELC). Comfort and ease are at the main focus here without losing sight of best conversion of pedaling force. Stiffness is indispensable in drive-relevant areas, but it has turned out to be hardly sensible to make the whole frame very stiff.

Too much stiffness in the wrong place leads to an insecure riding experience. The resulting lack of comfort also has an exhausting effect and thus negatively influence in the rider's stamina

All frames marked with the ELC-logo have been developed according to the concept of best possible conversion of steering impulses, dampening impacts and shock while optimizing stiffness in the decisive areas to transfer drive force to the road by maximum propulsion.

To combine ease, comfort and stiffness in the best sensibly and effectively way in all our latest-generation frames, we rely on wider cross-sections in the relevant tubes. This becomes particularly clear in the MTB carbon models Wild Edge and Black Adder, as well as the racing bike frames of the Night Hawk and Alpine Hawk. The wider attachment of the seat tube and chain stays in the bottom bracket area enormously increases the stiffness value in the drive area. The cross-ovalised construction of the top tube and the seat stays additional increase lateral stiffness without increasing weight – all in the sense of the ENDURANCE LITE CONCEPT. This way, we ensure that the energy used is not discharged uselessly through a twisting frame.

Regarding comfort, the wider, as well as flatter, tube design has clear benefits as well. In connection with the slim, elegant seat tubes and seat stays, the cross-ovalised tubes let the saddle deflect by a few millimeters in case of shocks. Fatiguing vibrations are thus efficiently dampened and the riding experience is sustainably improved.

And the thing is, it's the little details that make the difference. The lower steering set bearings we use have a diameter of 1.5 inches. In addition to their longevity, they permit use of conical and thus stiffer fork shafts that show their superiority specifically when carbon is used in the hard mountain bike area. All of these measures make frame production much more elaborate. The result and the many victories of the BULLS team are a clear statement to it

Breakthroughs in Bicycle Science

"What begins as a breakthrough becomes the standard for every bicycle on the road"



With an increased surface area for heat dispersion, Shimano's new ICE-TECHNOLOGIES FREEZA rotor has realized the ultimate in heat control. As a result, the 50° C reduction in heat gives greater durability and longer pad life.



It is an upgrade from its 9-speed predecessor. It basically allows for a finer selection of gears, thus improving efficiency and power.



The 11-speed drive train is used in both Road and MTB models. The cassette has 11 gears instead of 10 gears. This new 11-speed cassette has proved to improve efficiency and ultimately power thanks to its greater selection of gears.



This is the material of choice for the majority of better quality steel frames on the market today. It is actually an alloy of iron and chromium and is corrosion resistant, durable and only slightly heavier than aluminum.


Di2 (Digital Integrated Intelligence):


The advantages of Di2 by Shimano are clear for everybody who has tested it: changing gears becomes easier, effortless and faster by simply touching the shift buttons. Control at the top of your fingers. Additional benefits include an automatic trimming front derailleur, unmatched precision plus super easy installation and adjustment.



The frame is made of high-end carbon-fiber reinforced plastic. This material has a higher weight-specific strength and stiffness as compared to other materials. Carbon allows a more precise alignment of the construction that suits a rider's need.



As the frame's tube is shaped, extra material is allowed internally at each end of the tube. By increasing these areas of the tube, the overall tube wall thickness can be reduced, thus saving weight.



To save even more on frame weight, the double butting process is refined by stepping down the material at the ends of the tube. This means the butting starts out in the standard, double-butted manner but then is thinned before stepping down again to the normal tube wall thickness. In a cutaway, the inside of the tube looks like three terraced rice paddies on a hillside.



Full-suspension bicycles are some of the most popular mountain bikes available today, and for good reason. The past decade has seen dramatic advances in frame and fork technology, suspension designs and rear shock function, thus reducing its weight and increasing overall performance



The Mud Worm prevents the entry of dirt particles into the shift cables by covering open areas where cables joint other components.



Press Fit bearings are pressed directly into the frame, rather than screwed. The press-fit inner bearing guarantees higher bicycle stiffness, thus increasing the lifespan of the bearings.



The Shifty is an aluminum plate connecting the derailleur to the frame. It allows for a stiffer frame construction and a wider seat post, thus increasing rider comfort.



Higher frames require longer chainstays. The result is a much improved climbing capacity, which is relevant in large frames. After all, the centre of gravity clearly shifts backwards with a taller rider, specifically during the climb. Taller riders also need more space since they usually have longer feet, and for the longer cranks to avoid touching the chainstays with their heels



This is semi-integrated headset with an inner diameter of 1 1/8 inch at the top and 1 1/2 inch at the bottom. This ensures best riding stability and excellent control head stiffness. The biggest shaft results in stiffer fork and frame as riding forces are spread more evenly thanks to a thicker head tube.



Shimano's Shadow Plus clutch mechanism prevents the lower arm of the derailleur from pivoting forward, meaning that the chain is kept under considerably more tension. The claimed benefits are many: Less chain slap, fewer dropped chains, more stable and accurate shifting over rough terrain and ultimately a much better and quieter ride.



TSR is a telescopic seatpost, which can be remotely controlled from your handlebar, allowing for easier and faster adjustment. It allows for faster shift in the bicycle's center of gravity when approaching uphills and downhills.



The main advantages of this axle system are stiffness and strength, which added together results in a safer bicycle. It has a clear advantage on disc brakes over its traditional quick release counterpart as it allows for easier and more precise wheel mount/dismount operation.

Copperhead 2015: A Story of Success

"A Cross Country Classic Throughout Time"

Feeling the terrain, really pushing it or relaxing in a sporty way – the BULLS Copperhead is the perfect companion. Without frills and yet always at the latest technological and development standard, fans and press are impressed, every year yet again. The Cross Country all-rounder has taken many test wins in its price class and it impresses with its great performance and equipment.

Hence, Copperheads have always been one of the most sold bicycles in Europe and are often sold out as soon as the season starts. Since 2007 and every year after, our bestseller has been further refined and developed, fitted with our latest innovations, making sure it keeps itself continuously improved.

However, the basic values of the success model are not touched: Perfect frame geometry, filigree processing quality and amenities that can't be found in similar priced bicycles. All this and more, mark the unmistakable character of every individual Copperhead.

Perfectly tuned up for sporty and ruthless riding, the Rock Shox Reba fork, the Shimano XT components together with its hydraulic Ice-Tech Shimano disc brakes, fit our classic Copperhead with the necessary potential, even for the toughest tours through the wild.

Research and Development Team

"Without change there is no innovation, creativity, or incentive for improvement. Those who initiate change will have a better opportunity to manage the change that is inevitable."

The story of success of Bulls started in 2007 when the first team Bulls: bicycle professionals Karl Platt and Stefan Sahm, drew enormous attention from the cycling world thanks to their consecutive successes in long-distance competitions: winning the legendary Cape Epic, Transalp and Trans Germany in their very first year.

Over the course of the years, the duo grew into a large and powerful team with athletes from three nations who cover almost every area of Cross Country and Marathon in competitions all over the world.

In addition to the race for wins and success, on year 2007 Karl and Stefan became active participants of the Research and Development team at Bulls. Since then, the Team Bulls have been an active member of the Research and Development team in Koln, Germany. Through the years, this has been one of the key elements of success for Bulls in Europe and the world.


The Potential of Modern Wheel Sizes

Nowadays, looking at someone riding a 26-inch bike is almost exotic. The reason for this has less to do with the "recommended" wheel size but with the basis of physics.

Less rolling resistance, more traction and improved riding stability are just some of the persuasive arguments for the larger outer diameters of modern wheel sizes. Spots of unevenness and obstacles are more easily overtaken with less loss of speed thanks to a flatter rolling angle; this is accurate to say on all 29-inch wheels. That brings enhanced long-term performance for professionals as well as amateurs – for 29 and 27.5-inch wheels it means the unification of speed and safety.

Especially in the marathon sector, the 29-inch wheel demonstrates its advantages by enabling the rider to maintain a high speed with less effort. The enlarged contact area of the tire provides more grip and therefore more safety, especially in difficult terrain. Together with smoother running performance, it gives maximum sporty riding comfort that ultimately results in another factor equally important to both professionals and amateurs: Confidence.

This is additionally strengthened by a change in the frame geometry. Compared to a conventional 26-inch wheel mountain bike, the rider will have the sensation of somewhat deeper in the bicycle. This means that turns in particular can be ridden with higher speed.

The somewhat smaller 27.5-inch wheels – also referred as to 650B – show their potential particularly in the All-Mountain category, due to the easier acceleration on account of their lower weight, they bring more stability and rigidity with similar construction. At the same time, the frame becomes more agile because of shorter chain stays and top tubes. Apart from improved rotating ability on trails with tight turns, they offer smaller riders optimally proportioned bikes. This wheel size is especially well suitable for All-Mountain bikes. For bikes with a wheel travel of 150mm or more, 650B wheels offer the rigidity and strength needed for optimal performance on rough terrain.

Of course there is more to it than choosing a wheel of "recommended size" on a slightly modified frame. The top results of TEAM BULLS in world-class professional mountain biking as well as top results in numerous tests have proved that our BULLS engineers know how to design high-class bike




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