Updated on February 1, 2024


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
  1. Bici-Tec
Tested By
  • Bici-Tec
Content Partners


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.

Target SDGs

SDG 2: Zero Hunger

SDG 8: Decent Work and Economic Growth

Market Suggested Retail Price


Target Users (Target Impact Group)

Household, Small and Medium-sized Enterprises

Distributors / Implementing Organizations

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

Competitive Landscape

Direct competitors include D-Lab Corn Sheller and Maya Pedal Bicycle Mill.

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


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)

200 pounds per day, ~13.6 kg/hr

Manual or motorized


Perforation sizes for nuts (mm)


Shelling efficiency (%)

95%user experience report


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

Product Schematics

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

It can shell up to 200 pounds of corn in one day

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. Bici-Tec Bici-Tec also donates the product partially or completely to families with great need. Interview with representative 2018 Through Bici-Tec’s Escuela De Bici-Tecnología Apropriada students can learn how to build and design pedal powered machines such as the bici desgranadora de maíz. Bici Tec Facebook Page Bici maquinas or recycled and other projects

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