Updated on April 27, 2023


Created on August 24, 2017

Bici Desgranadora de Maíz

Upcoming Update

Bici Desgranadora is a pedal powered corn sheller machine designed to reduce manual labour.

Developed By Unknown

Product Description

Bici Desgranadora de Maíz is a pedal powered corn shelling machine. The machine uses bicycle parts combined with a corn sheller to decrease manual labor and time required after harvesting.

Distributors / Implementing Organizations

Bici-Tec distributes the product directly and works with community leaders to distribute it.Interview with representative in 2018

Manufacturing/Building Method

The Bici Desgranadora is made from bicycle received as donation from the US and Canada, bicycles that cannot be reconditioned are dismantled with certain parts (pedals, bicycle frames, etc) used in designing the pedal powered bicycle corn thresher. Materials are sourced locally and incorporated in the building of the equipment. The metal frame for example is welded together to the other engineered parts like the seats which is made from plywood. The flywheel is made by adding cement to the mould of the wheel. The equipment can be ordered and made to specification of the client, thus the building methods are half artisanal and half industrial.

Intellectural Property Type

Open Source

User Provision Model

Direct from manufacturer, to place an order call Carlos Marroquin at +502 4080 1572 or reach out to the company through their Facebook page

Distributions to Date Status

~2,000 Interview with representative at 2018

Shelling capacity (kg/hr)

Manual or motorized


Perforation sizes for nuts (mm)


Shelling efficiency (%)


Used bicycle parts, steel, plywood and cement.

Varieties shelled

Any corn variety

Nut breakage rate (%)


Design Specifications

The product is stationary and pedal powered, it requires no electricity to be operated. It is made from used bicycle parts such as pedals, frame, chains and handles. The pedaling system is connected to a cement flywheel to facilitate continuous pedaling and uses sprockets' diameter relation to vary speed and torque. The system is connected to a corn sheller in a position where the same person pedaling can feed it.Interview with representative in 2018

Technical Support

Bici-Tec trains users upon delivering the product on maintenance and preventive measures to ensure product durability. If needed Bici-Tec can also do any repairs or additional technical support.Interview with representative in 2018

Replacement Components

Available at Bici-Tec and locally available at bike shops.Interview with representative


The product can be reused afterwards to make more bici maquinas or recycled at a common recycling center since most of the structure is steel.

Manufacturer Specified Performance Parameters

Vetted Performance Status

According to users it can shell between 1,500 and 2,000 pounds a day if used from 8:00 am to 3:00 pm, family members take turns pedaling. This is 7 times faster than manual shelling. User experience report


As the components are mainly assembled through welding, there is a risk of injury if components are not properly welded together or the welding weaken.

Complementary Technical Systems

Bici-Tec teaches, empowers, and encourages people to use pedal powered machines (bici maquinas) through their school Escuela De Bici-Tecnología Apropriada

Academic Research and References


Compliance with regulations


Other Information

There is a user experience report available.

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