The 26" wheel
A new concept to have the possibility of changing the lever and the constant and inconstant diameters while pedalling in order to optimize the rider’s strength, the speed changes, the riding, the athletic skills.

The 26” wheel bicycle
This OBRII bicycle seems a common bicycle at first sight except for the smaller wheels, but it’s the result of studies and improvements made by Lorenzo Sanesi along his experience.

Giving the principle that a wheel is opposed to the changes of speed, the more it’s opposed the higher is its time of inertia; given the time of inertia is directly proportional to the wheel spoke square, a reduction of the spoke causes a remarkable reduction of its inertia.
A 26” wheel has a time of inertia less than 25% about in comparison with a 28” wheel.

For the same reason a smaller wheel opposes less resistance to the direction changes of its axis.
If all this is applied to a bicycle wheel it means to have a more reactive mean with a faster reaction to the speed changes, that allows a remarkable skill in “twists and turns” that often have to be done in a windy descent.

Let considering another simple physical principle: giving a longer bar and applying the same force you can produce a higher torque.
That’s the reason why OBRII bicycles with 26” wheels have longer pedal cranks (2 millimeters and half longer than the normal measurement taken from the relation between femur and tibia). This leads to saving about 3% as a torque (watt).

The sum of these innovation changes leads to a bicycle that has a faster reaction to the speed changes, and allows to increase the strength (which is the product of the torque by the rotation speed) at a high speed.

Such a planned bicycle gives remarkable advantages in climbing and sprinting. While riding on the plain at constant speed there’s no advantage or disadvantage, as the metric development is kept at normal values by choosing crowns and pinions opportunely.