gallery/precisia bikes logo with tm



The lever propelled bicycle specialist!

New 2020 Torque King

under research


gallery/bicycle label


Rent a bicycle in Durham, North Carolina and enjoy the torque.

gallery/IMG_0216 (2)
Shop now

These bikes are classified as SPB  (Superior performance bicycles). That is because these bicycles have been scientifically proven to  have more torque per range that the conventional bicycle, gravitationaly advantage when pedaling the bicycle standing up and more consistant torque output from pedaling peak to pedaling base. This makes hill climbing on this bicycle better than the adverage bicycle and you can feel the diference. Enjoy the Torque!


Free Shipping

for local costumers


gallery/website picture



gallery/IMG_0156 (2)
gallery/IMG_0180 (2)


Wraparound Cruiser

Dineemah rope souvenir bracelet

gallery/website picture

Not availible

Please text (919) 888-9232 for an apointment. Then click a rate below to pay. This service is only for Durham, NC residents and neighboring cities.

Terms and conditions: NO STUNT JUMPING

Terms and conditions: NO STUNT JUMPING

gallery/new torque king

RENT A BICYCLE in durham, north carolina AND ENJOY THE TORQUE

The Science Behind Superior Performance Bicycles

Technical Manual and Science Treatise

Made and Developed in Durham, North Carolina.


Resistance and Vector Forces

Gravitational Advantage

Circumference and Lengths of curves

Torque test and proof of superior performance

How the bicycle works

How to maintain the bicycle.

Resistance of Vector Forces

The way the Superior Performance Bicycle (SPB) has its advantages can be explained using a cannon ball and shooting it at two types of curved surfaces. One surface is a perfect half circle (FIG.1), wherein the bottom of the curve flows straight onto a concrete pavement while the cannon is a step down from this horizontal pavement to allow the cannon ball to roll smoothly from the nozzle. The other curve is fraction curve (FIG. 2) of a radius, so much that, it is almost linear in shape, but with a slight curve. The end of this curve is tangent to a concrete pavement and a step up from a cannon gun nozzle so that the ball can roll smoothly on the pavement after firing.

      So when both of these cannon balls are fired at the same time and if each curve on the concrete pavement were able to slide when pushed forward, which curve would move the furthest? Of course the answer would be the curve that is the perfect radius. The cannon ball wants to move in a straight line due to the laws of physics, but the curve puts up much resistance causing the ball to move in a half radius motion, but the curve puts up much resistance causing the ball to move in a half radius also moves forward too. This is the result of resistance acting against the movement of the cannon ball. Of course the slightly curved ramp will move forward too, but at a lessor distance. That is because the curve is more closer to a straingt line, which is what the cannon ball wants to travel in anyway, thus this curve offers less resistance and will move a lessor distance than the half radius curve as illustrated in Figure 1.

     The pedaling motion of a conventional bicycle works in a similar manner as explained in the previous paragraphs. One stroke from the top to the bottom in a conventional bicycle moves in a perfect half radius. So just imagine the foot being the cannon ball and the pedal being the curved ramp. When the rider pushes the foot down, the foot by physical nature wants to move in a straight line, but the crank arm will forced the foot to move in a half circle. So this curve would by nature generates more resistance than a curve that is slightly curved, but move closer to a straight line. That would explain why the SPB generate more horse power when the ranges or pedal movement per rear wheel movement are matched, but if the same exact wieght is applied to both pedals in the middle downward stroke position, the SPB will produce more horsepower output when pressed against a weight scale.

Gravitational Advantage

Gravitational Advantage comes in handy at the peak of the SPB’s pedaling stroke. At the peak of the pedaling stroke the pedal path of the SPB is closely aligned with the pull of gravity from the earth. So if you drop a marble in a vacuum, you should observe that the marble will move downward in a perfect straight line. Likewise if you are pushing a pedal that is closely aligned with the pull of gravity at the peak of that pedaling stroke there is going to be less resistance at that position than a pedal in a peak position on a conventional bicycle. The reason why this is true and has been scientifically proven is because that the crank arm of a regular bicycle is pointing in the opposite direction of gravity at its peak pedaling position. At its peak, it is pointing 90 degrees. So if you were to position the crank arm at 90 degrees and perfectly apply 90 degree downward force to the pedal through the center of the crank arm, the bicycle would not move.

      In real life the scenario would be unrealistic, but this scientific fact does provide evidence as the why if you match the ranges up between a conventional bicycle and a SPB, and apply the same weight of downward gravitational force at the pedaling peak of each bicycle, the SPB would turnout more forward horsepower than a conventional bicycle if both were pressed against a weight scale.

Circumference and Lengths of Curves

This topic is important so that the operator of this bicycle may understand pedal stroke range, work and propulsion movement. If the mechanical configuration of the conventional bicycle and SPB were matched in a way that the peak to base pedal stroke were 14 inches in length that would mean that the diameter of the crank are axle would be 14 inches, while the height to base stroke of the SBP pedal movement would be 14 inches. Understand that the radius of the lever machine of the SPB in 22 inches, almost twice the length of the conventional bike. Thus, the length of the curve would be less than that of the conventional bicycle because it is almost linear in shape or closer to a straight line.

      Thus, the distance of the circumference portion of the SPB is only 65% of the length of the conventional bicycle. So if you calibrate the pedal movement to rear wheel movement ratio, so that the pedal move 1 inch and the rear wheel moves 4 inches, as long as you move a pedal or pedals the same distance according to the physics definition of work and both bicycles move the same distance than the ranges of both bicycles are matched. So if you were to pedal a conventional bicycle and move the pedal from pedal peak to base, which is half of the circumference of the 14 inch diameter, that would be 14 in x 3.14 = 43.96” divided by 2 = 21.98 inches. So the distance the pedal traveled would be 21.98 inches. So being that the pedal distance of the SPB would be 65% of that of the conventional bicycle just simply multiply 21.98 inches x .65 and you get 14.287 inches. In order to get the other 35% of the pedal stroke you simply have to multiply .35 x 21.98 inches and you get 7.693 inches. So the other side of the SPB you would have to push the pedal 7.693 inches to do the same exact work as the conventional bicycle, once the range of both bicycles are matched. On a conventional bicycle if you pedal one complete stroke and cause the wheel to rotate 360 degrees. On a SPB you would pedal on complete stroke and cause the wheel to rotate 234 degrees. Both ranges are matched. The you would pedal the SPB another 7.693 inches to complete a 360 degree turn on the SPB. According to the physics definition of work both bicycles did the same amount of work. So if you moved the conventional bicycle pedal, a total of 21.98 inches in a pedal stroke and you moved the SPB pedal a total of 14.287 inches with one pedal stroke and the opposite pedal 7.693 inches then you would have pushed a pedal or pedals a total of 21.98 inches on both bicycles moved both bicycles the same distance. So according to the PHYSICS definition of work both riders on the two bicycles did the same amount of work. But the rider on the SPB used less energy to pedal the bicycle, that is because the SPB generates more watts than a conventional bicycle due to its vector force/mechanical and gravitational advantage. Furthermore, the fact that a rider can use gravity and force vector advantage to climb a hill faster than a conventional bicycle having the same range, means that this bicycle has more mechanical power because you are able to do more work on the SPB in a shorter period of time.

How the Bicycle Works

The bicycle presented in this technical manual is classified as a compound force multiplying machine powered bicycle. That is because it has two types of lever machines multiplying force input from the pedals and transforming that force into horizontal propulsion power.

      The obvious force multiplying machine is the simple second class lever machine. Which is defined as a lever machine that has a fulcrum on one end, the area of applied force at the other end and the load being moved in between the fulcrum and area of applied force (Pedals). The load in this bicycle is closer to the pedal than to the fulcrum. So it generates a force of 1.57. The other lever machine is a more complex Input/Output lever machine that is gear like, but instead sprockets are used. So in this case the input is always greater than the output, so in other words the input sprocket would have a greater diameter than the output sprocket. So the 2 inch diameter drive cylinder would be divided by the  pitch diameter of the 9 tooth drive sprocket, which is 1.4619022. The equation would yield 1.368. Multiply this number 1.368 by 1.57 and the total output to the rear wheel sprocket would be 2.1478865. This output allows your weight to be doubled or multiplied by 2.1478865. So if a rider weighed 200 lbs and shifted his or her weight on a pedal, 429.5773 lbs of torque would be generated by this complex torque multiplying machine and applied directly to the sprocket connected to the rear wheel. Two ropes provide reciprocal motions of the this bicycle. One rope made of Ultra-high-molecular-weight polyethylene UHMWPE or more popularly called Dyneemah rope is used to propel the bicycle. It pulls and rotates the radial drive member constructed out of an aluminum cylinder. The cylinder is glued around a modified sprocket. This sprocket is modified because the sprocket teeth has been removed so that the rim of the sprocket can completely fit inside of the cylinder. Once this is possible, the outer surface is sanded to a course finish, while the inner surface of the cylinder is sanded to a rough finish, then 3M dp 40 is applied to the outer surface of the modified sprocket and glued to the inner surface of the drive cylinder. Holes are drilled through the outer surface of the cylinder then the aerospace resin is applied from the outside to lock the cylinder to the outer surface of the modified sprocket. A smaller bent cylinder, with a .375 inch inner diameter is welded to the outer surface of the drive cylinder at an angle. The Dyneemah rope is glued to the inside of this smaller cylinder using  3M dp 40 resin. This is the point where the rope pulls against the drive cylinder. The angular position of the smaller cylinder allows the Dyneemah rope to wrap around the drive cylinder in a spiral shape without wrapping around itself in most cases. So when the lever machine pulls this rope, the rope then rotates the drive cylinder forward. The drive cylinder then rotates the drive shaft that is welded to the threated adapter. The threaded adapter is fastened to the modified sprocket mentioned before, Also welded to the drive shaft is the 9 tooth output sprocket. So when the drive cylinder is rotated by the pull of the lever machine, the drive shaft rotates the 9 tooth sprocket forward. The transmission chain interacts with the 9 tooth sprocket and in turn rotates the cassette sprockets or multi speed hub connected to the rear wheel. Then the rear wheel is rotated forward, which causes forward propulsion of the bicycle.

      Each lever machine is hollow and has a steel rope reinforcing it from the outside. Each lever machine has a rope that is connected to it from opposite ends from the bottom surface. The lever machines tubes in the SPB are hollow as well. Thus, they are not reinforced from the inside, but from the outside using steel gavinized rope. So when using this rope, it would be used to redirect vertical pulling force on the lever machine and making this force horizontal, thus pulling on the ends of the lever machine, instead of a point on the lever machine, whereas if enough force was applied at this point is would bend the tube of the lever machine, even if it was reinforced from the inside with metal beams. It has been proven over time, that when a load is pulled by a lever machine constructed mainly of a tube reinforced with metal beams from the inside, this reinforcement would still be inefficient in preventing this tube from bending at the load point. When the foot presses down on the pedal and pulls the linear transmission means at a point on the lever machine, the circumference strength of the tube structure and its vertical beam reinforcement at that point, is pulling the propulsion load, but if this load point is pulling at opposite ends of the tubular structure, then the whole strength of the tube is harnessed increasing its structural strength 10 times. This is because it is easier to bend a tube at a point along its length, than to crush a tube from one end to its opposite end or to compress a tube by applying horizontal force by pushing on one end and its opposite end inwardly against itself to bend or compress it. Thus, redirecting the pulling force of the lever machine vertically to a horizontal direction would increase the strength of the lever machine and prevent it from bending. Furthermore, by leaving this tube hollow and not reinforcing this tube would make it lighter in weight than a tube reinforced by metal beams. This is because a steel rope is far lighter in weight than metal beams, allowing the bicycle as a whole to be lighter than other lever propelled bicycles in its class. So most of the tube is hollow, while the rope is fastened by chemical means from the outside of the tube within smaller tubes welded on the bottom surface of the main tube. The front and rear of each lever tube is constructed of round ends, which are also hollow tubes that are joined to them by the tig welding process. These rounded ends allow the steel rope to partially wrap around them to the bottom surface of the main lever tube, so they won’t pull against a sharp edge and damage the rope. Thus, this assembly maintains the structural integrity of the rope and tube assembly so quality in pulling performance can be maintained. At the frontal ends of each lever machine are two vertical plates or pedal mounts that are welded with a gap between them, which allow the steel rope to pull between them uninterrupted, in a straight line. Above this gap or space is a plate of metal that maintains this gap, so that each pedals between the upper surfaces of the pedal mounts can pivot back and forth with reduced friction.

Torque test and proof of superior torque. How less vector force resistance results in superior performance

Three tube bending dies were tied together on a plastic rope and looped around the pedal of conventional bicycle while the pedals were at an 180 degree turn (approx.).

Then a tube taped to the handle bars was pressed up against a digital scale when the pull of the weights pushed the bicycle forward. The Red tube bending machines props the bicycle up with the plastic rope in order to get accurate scale readings.

The scale reads 3 lbs and 10.6 oz of forward pressure.

The same experiment was conducted on the SPB using the same weight.


The same tube was taped to the handle bar of the SPB and pressed up against the digital scale when the weight on the pedal pushed the bicycle forward. The digital scale yielded 6 lbs and 11.2 oz. Almost twice as much as than a conventional bicycle using the same weight. Thus this bicycle cranks out almost twice as much horse power than a conventional bicycle when the pedal movement to rear wheel movement ratio are matched.


This demonstration was necessary to illustrate how both bicycles can be tested, if you have a SPB in your possession and wish to try this experiment on your own to verify the results.



All questions and inquiries should be forwarded to

The lever propelled technology was invented and built at 4230 Garrett Rd, Durham, NC 27707 (USA).

My name is Rashad Scarborough. I was born in Newark, NJ and raised in North Carolina. I have been developing this technology for 14 years and getting close to perfection in bicycle performance. The book, entitled: The Science behind Superior Performance Bicycles, would explain how two force multiplying machines combined (Pulley wheel and Lever machine) would amplify torque output, while maintaining significant amount of range useful to all humans worldwide. This machine is a useful tool for aiding humans in the journey of life. I founded the company call Precisia Bikes LLC. A company that specializes in lever propelled bicycles.


About us

gallery/original p2
gallery/htc bicycle1
gallery/website picture

2011 Original P

2014 P Classic 

2018 HTC 

2019 Wraparound Cruiser 

2020 Torque King


Free Shipping

for local costumers


gallery/IMG_0156 (2)
gallery/wraparound illustration