Bike Chain Tensioner

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Bike Chain Tensioner
Description This chain tensioner can be used to address issues with chain hopping, chain slap, and rattles.
Intended use transportation, hobbyism
Keywords 3D printing, bicycle, bike chain tensioner
Documentation language English
Appropedia user User:Spoonless
Project status Prototype
Project was made Yes
Countries of design Category:United States
Main materials Plastic
Estimated cost 23.50
SDG Sustainable Development Goal 8

Bike Chain Tensioner[edit]

Project developed by User:Spoonless
This OSAT has been prototyped.

You can help Appropedia by contributing to the next step in this OSAT's status.


This chain tensioner can be used to address issues with chain hopping, chain slap, and rattles. It can be printed and assembled for less than $6, and offers equivalent perfomance to comercial products sold for $30.


Bill of Materials[edit]

  1. Tensioner.scad
  2. (2) ZipTies
  3. (1) 8-32 Thread, 1-1/4" Length Machine Screw (eg. McMasterCarr:91792A201)
  4. (1) 8-32 Thread Locknut (eg. McMasterCarr:91831a009)

Tools needed for fabrication of the OSAT[edit]

  1. MOST Delta RepRap or similar RepRap 3-D printer
  2. Screwdriver
  3. Adjustable Wrench or Pliers

Skills and Knowledge Necessary to Make the OSAT[edit]

  • Ability to use a 3d printer.
  • Ability to use a wrench and screwdriver.

Technical Specifications and Assembly Instructions[edit]

All parts are symetric such that component orientation is not an issue.


  1. Ziptie the cage to the Bicycle frame just above chain.
  2. Hold the chain up so it is captured in the cage.
  3. Bolt the pully in place
  4. gently crank the pedals by hand and shift throug all gears to ensure nothing is binding

Common Problems and Solutions[edit]

  • If the fit to they bicycle is loose or overly tight the OpenScad variable "pipeDia" can be set to match your bike frame's tubing diameter.

Cost savings[edit]

  • Approximatly $23.50 (78.3%)
    • 30g of PLA at approx. $30/kg = $0.90
    • Machine Screw, Locknut, and bag of zip ties approx $5.60 at local hardware store
    • Equivalent Chain Tesnsioner: Bionicon C.GUIDE approx. $30
    • 30 - (5.60 + 0.90) = $23.50