Bike Chains 1 – Chain Wear

Table of Contents

• Endless Post
• Finding Chain Wear
• Bicycles, Chains, Friction, Lubricants
  • Safety bicycles
  • Chains
  • Friction, Wear & Lubricants
• Chain Replacement
  • Specifications & Standards
  • Measurement of Wear
• Searching the Web
  • Limitations
  • General Knowledge Resources
  • Cycling Knowledge
  • Online Magazines, Journals & Cycling Sites

Endless Post

I have posted what I have written to date. This post will become an endlessly updated post.

Finding Chain Wear

I am not an engineer or mechanic. I have done basic home maintenance on my bikes. Until 2021 I had not read any of the material about chain wear online or published in any cycling magazines or books.

In April 2021, I thought I had less than 2,000 Km on the KMC X11 (11 speed) chain on my Cannondale Topstone gravel bike since purchasing the bike in August 2019 ¹ When I did the math, it was over 4,000 . I did not know the industry standard for 11 speed chain elongation and chain replacement.

I had been washing the chain every two or three weeks in a clamshell tool – a Park Tools CM-5.3 Cyclone chain cleaner – with a few ounces of the Mountain Equipment Cooperative Bio-Cycle liquid cleaner and immediately after the wash, applied clean lube (a drip lube). I used ProGold Pro-Link and Muc-Off’s retail dry lube product. I had evidently made bad choices.

I had problems when chain did not respond to the shifters, or skipped, or seems to make rubbing noises. The Park Tool CC-3.2 chain checker was reading that the chain was worn and should be replaced. I located a SRAM PC 1170 chain and a supply of SRAM Powerlinks (SRAM proprietary master links). This was fortunate, in view of the effects of the Covid-19 pandemic on the manufacturing and shipping of bicycle components.

It was my introduction to maintaining and replacing the chain on a modern bike.

Bicycles, Chains, Friction, Lubricants

Safety bicycles

The 21st century bicycle is an industrial product evolved from the safety bicycle which was an industrial product created and manufactured after late 19th century innovations in material and manufacturing. The high mount bicycles (including penny-farthings) in use in the 1860’s and 1870’s had pedals and cranks that directly drove a large drive wheel. A drive chain lets a rider seated between the wheels power a geared drive wheel. The safety bicycle has been incrementally redesigned for more than a century. An article in Bicycle Times in 2017 is illustrated with images of 25 influential bicycle designs, mainly in the 20th century. The article does not include samples of the designs that have dominated the bicycle markets since about 1993, except a 2005 fat tire bike. It does not include cargo bikes of any era. It does not include any e-bikes.

The majority of bicycles in Europe, North America and world wide in the first six decades of the 20th century were single speed utility bicycles. These bicycles were popular in Europe and North America until the 1970s. The Chinese government began to built the Flying Pigeon bicycle in 1950. 75 million were made and sold. David Edgerton counted bicycles as an old technology that was adapted in Asia in his 2007 book The Shock of the Old: Technology in Global History Since 1900. Bike manufacturing in Asia up to the 1970s was mainly devoted making bicycles for riders in Asia. The ownership of bicycles increased in China as production increased in the 1970s. Part of the Asian production was commissioned by bike manufacturers elsewhere in the world. Asian manufacturers became proficient in producing new bicycles and components for the world market. Shifts in consumer tastes in Europe and North America spread to other parts of the world. Many Asian consumers began to have sufficient resources to afford and favour foreign designed bikes. Chinese consumers purchase brand name bicycles popular in other parts of the world. Chinese consumers have purchased motor vehicles, as they have become more affluent.

Chains

By the early 20th century the bike industry began to use bushed steel roller chain on most bicycles. Some parts of the history of the bicycle roller chain supply chain have been discussed by historians of sport or commerce. The Japanese firm Shimano is one of the dominant forces in manufacturing bicycle components, including cranks, derailleurs, and chains. It outsources a portion of production of its branded chain to manufacturers else in Asia, e.g. KMC of Taiwan. As of the early years of the 2020s, most chains are manufactured in Asia.

The bushingless chain has become the dominant design; the roller chain has been a constant. Bicycle roller chains have been made of steel since they were introduced, as far as I can tell. Steel had the tensile strength for the purpose, and could be produced with relatively smooth surfaces. The parts that connect the links are made with tight tolerances, for transmission of force. There are microscopic gaps between pins and rollers and/or bushings, which allow the links to pivot to rotate on the chain rings and the cogs of the driving wheel transmission apparatus. The basics of roller chain are alternating inner and outer links, the ability to bend at the ends of links, and rollers.

The most efficient line from the chain wheel to the cog on drive wheel for single speed bicycles was parallel to the bicycle. In Europe and North America, riders and designers favoured systems that allowed the rider to shift gears to use power effectively and respond to changes in conditions and the goals of rider – e.g. going faster with the same effort. Road racing brought the development of derailleurs to shift the chain onto other gears – and a flexible chain that could operate at a slight deviation from a straight chainline. Chains are designed to flex to displace far enough to change gears when pushed by the pulleys (jockey wheels) of a derailleur. Innovators altered the design of chains to get lighter, more efficient chains. At the end of the 1970s, a road bike might have 5 or even 6 cogs on a rear cassette. Mountain bikes adopted derailleurs, flexing roller chain, and other technology from road racing. Mountain biking became competitive and mountain bikes became popular. For a time, drive train components were specialized: road or mountain/hybrid. Some innovations made in road chains or mountain bike chains became common or dominant in chain manufacturing. time.

The chain has to run over and under a chain stay – usually on the right side of a conventional two wheeled safety bike. The chain stays are welded or attached to the bottom of seat tube near the bottom bracket shell, and to the seat stay. The chain stay is one side of a closed triangle. Before the use of master links, it was necessary to use a chain “breaker” tool to displace a pin to remove the chain. Removing the chain was not a common practice before the development of master links. Master links, devices that replace a single outer link, became common in the 1980s and 1990s. Master links make it easier to remove a chain for cleaning, maintenance and replacement. They were noted in the BTI glossary (see Sheldon Brown and BTI under Cycling Knowledge below). There is more on master links in Bike Chains 2 in this series under the heading Master links.

Even with master links, removing a chain is an operation which many cyclists do not have the time, tools or knowledge to attempt.

Friction, Wear & Lubricants

Lubricants are materials that are applied to surfaces of other materials to reduce friction when force applied to the materials and the surfaces move against each other. A lubricant reduces kinetic friction by changing static friction to lubricated friction, allowing metal surfaces to slide or turn without getting hot and making noise.

A metal roller chain does not stretch. It wears, which makes it get longer – a longer chain fails to fit the cogs and fails. Microscopic wear on individual links adds up. A worn chain does not fit the chain wheels and cassette cogs, and abrades the drive train.

For much of the 20th century, bike chains were lubricated with motor oil – a refined product made from crude petroleum. Motor oil was and is a specialized product to lubricate parts of an internal combustion engine. At the end of the 19th century, industry settled on the internal combustion engine as the device that could be used to power passenger cars, motorcycles, transport trucks, farm machinery and industrial machines. In this context, the development of the safety bicycle seems less consequential for the use of energy, or as a means of transportation.

Academics and industry researched and developed many lubricants for many purposes. Bike chain lube has become a specialty market. Bike shops sell what they can get from suppliers; bike owners/users have limited help in finding and choosing the best lubricants. The best is not easily found and applied, or necessarily very effective at avoiding chain wear.

Chain Replacement

Specifications & Standards

By 2021, most modern bikes, other than e-bikes, on the market (in Canada and the USA) had rear wheel cog cassettes with 11 or 12 cogs. Elongation of 11 and 12 speed bushingless chains by .5 – one half of one percent – of the length of a chain is the replacement point. It is implicit in the design of chain gauges (chain checker tools), and known to the employees of bike shops and to some some users. 11 speed chains and rear cassettes were introduced by Campagnolo in 2008, and by Shimano in 2013. 11 speed cassettes and chains became a common feature of new bikes. The design, release and sale of modern chain gauges followed.

The .5% standard translates to about 7 mm over the length of a chain. The length of a modern chain varies, depending on the length of the chainstays, the sizes of the largest chain ring and the largest rear cog, and the rear derailleur shape and size. A chain may have 55 to 59 links (counting a link as 1 Outer plus 1 Inner) or 110 to 118 links. A chain may be 1397 mm. to 1473 mm. long A chain gauge checks for wear in a span of 12-14 links. The gauge has to precisely cut/machined and precisely used to detect elongation of .5 mm. It is useful to put the gauge on different places on the chain to look for wear.

Many riders assumed that steel chains were very durable. The existence and marketing of chain gauges suggests the modern cycling component, tool, and maintenance industries expect riders to check and replace chains.

Measurement of Wear

There is more on chain gauges and measurement in Bike Chains 2 in this series under the heading Checking for Chain Wear.

Searching the Web

Limitations

Search engines look for web content. The web came into being a century after mass production of safety bicycles and components began. Information about materials, designs, mass production and marketing was not necessarily written down, or digitized, or put on the Web. Written material may have been copyrighted; on the internet it may be gated or paywalled. If it is on the Web, it may not have attracted searches or hits. Search engine algorithms follow and lead the crowd

Web searches generate long lists of links. Some search engine hits are predominantly text or text with static images. Search engines may show hits for videos, including YouTube videos but usually not podcasts. For podcasts, a user needs to search for podcast in an podcast index. Many or most text pages and videos:

• are direct advertisements for products, or endorsements;
• are low value “reviews”.

Searching the web in a search engine for about bicycle chain cleaning, maintenance and lubrication is a flawed way of learning.

Searches for recorded audio and video material (podcasts, YouTube) appear to depend on a few searchable lines of text, an item title, or the organization of the resource (the identity of an author or publisher, channels, tags, indices etc.). After getting a good hit, a user needs luck and time to find the moments when a subject will be explained.

Reviews can be useful in finding products, but have limited value in evaluating products. It is not possible to find out how the author or publisher has influenced, or has preconceptions. Many reviews reflect personal experience in conditions that are not clearly explained, or quick reactions. The comparisons are between the products which the author or publisher mentions i.e. are limited to as to what is available or known to the writer. The testing, if any, is not scientific and does not assess the actual conditions of use. Many reviews or overviews are catalogues of methods, sometimes narrow, sometimes overly broad. Many make improbable claims about products.

Comments in forums may reflect experience, but the amount of experience with the products is not clear. Some comments reflect frustration that the bike industry keeps selling more expensive new bikes and components while bikes are harder to maintain without tools, supplies and knowledge. There are many resources reflecting many opinions. There is no “wise crowd”; people who sell, fix, buy or ride bicycle do not assess facts the same way.

General Knowledge Resources

Wikipedia is reasonably fulsome. The Wikipedia page for bicycle chain says that chain cleaning and lubrication are important, complicated and controversial:

How best to lubricate a bicycle chain is a commonly debated question among cyclists. Liquid lubricants penetrate to the inside of the links and are not easily displaced, but quickly attract dirt. “Dry” lubricants, often containing wax or Teflon, are transported by an evaporating solvent, and stay cleaner in use. The cardinal rule for long chain life is never to lubricate a dirty chain, as this washes abrasive particles into the rollers. Chains should be cleaned before lubrication. The chain should be wiped dry after the lubricant has had enough time to penetrate the links. An alternative approach is to change the (relatively cheap) chain very frequently; then proper care is less important. Some utility bicycles have fully enclosing chain guards, which virtually eliminate chain wear and maintenance. On recumbent bicycles the chain is often run through tubes to prevent it from picking up dirt, and to keep the cyclist’s leg free from oil and dirt.

Wikipedia (October 2021) on Bicycle Chain

Cycling Knowledge

Some scientific research and publications are summarized in Bike Chains 3 in this series, under the headings and subheadings Lubricants: Scientists, Lubricants: Paraffin, and Lubricating a Chain: Academic Research.

The late Sheldon Brown, a bike mechanic in Boston, and a modern polymath, started writing on the Web by the early 1990s. He had contacts among local riders and shops, and participated in Usenet news groups and other online forums on cycling. His web wages on cycling were hosted by his employer, Harris Cyclery, until it closed in 2021. His pages have been published by a community of friends and fans, and some topics are being updated or added.. He wrote extensively and collected internet material. The Bicycle Technical Information pages (“BTI”)were a leading online source of information about bicycle repair and bicycles. The pages captured parts of the histories of bicycles and components, manufacturing, repair, touring and riding. Sheldon Brown promoted Sutherlands Handbook for Bicycle Mechanics by Howard Sutherland, (the 6th and 7th editions are available as of 2022 from Sutherland’s Bicycle Shop Aids in California), and published articles by several authors on technical bicycle repair and maintenance matters. (The publishing industry lost interest in publishing printed books about those subjects).

The BTI pages reflect a perspective on innovations in the industries in the 1990s, and have not addressed all the maintenance issues arising from early 21st century innovations, although some page have been updated. A few comments that do not hold up (for instance, that riders should not try to remove factory grease from a chain). The BTI pages that mention chains, lubrication and maintenance include:

• an entry on chain in the bicycle glossary;
• a major article on chain maintenance;
• other articles on gears & chains, including the 2002 article Chain Care, Wear and Skipping by the late Jobst Brandt.

The contributors to the BTI pages had varying experiences in life. Some were engineers and mechanics, or knew about some industries. Some were computer enthusiasts. Some read science fiction.

Sheldon Brown’s Bicycle Technical Information (“BTI”) pages have been updated since his death in 2008, and continued to be published after Harris Cyclery closed in June 2021.

The expressions like there ain’t no such thing as a free lunch (“TANSTAFL”) was well known, and used by the popular golden ager SF writer Robert A. Heinlein ²a golden age conservative or libertarian on some issues; also see the Quote Investigator site’s page 2016/08/27. or kludge were used to describe the realities of riding and fixing bicycles and the results of financial, organizational and decision making processes of bicycle manufacturers, politicians and traffic engineers. ³TANSTAFL was adopted by the economist Milton Friedman, and has become a libertarian and anarcho-capitalist slogan implying “you get what you pay for“. I use TANSTAFL to mean “it is what it is“.

This comment published in a BTI page on how riders adhere to beliefs about chain maintenance rings true:

Chain maintenance is one of the most controversial aspects of bicycle mechanics. Chain durability is affected by riding style, gear choice, whether the bicycle is ridden in rain or snow, type of soil in the local terrain, type of lubricant, lubrication techniques, and the sizes and condition of the bicycle’s sprockets. Because there are so many variables, it has not been possible to do controlled experiments under real-world conditions. As a result, everybody’s advice about chain maintenance is based on anecdotal “evidence” and experience. Experts disagree on this subject, sometimes bitterly. This is sometimes considered a “religious” matter in the bicycle community, and much vituperative invective has been uttered in this regard between different schismatic cults.

Sheldon Brown & John Allen, Bicycle Technical Information, Chain Maintenance

Online Magazines, Journals & Cycling Sites

I have learned from reading text, listening to podcast and watching videos. I have been persuaded by some of the material from a few sources.

The resources at BikeGremlin have been written with care, and takes the range of views and experiences of some riders and mechanics into account. It addressed lubrication in the article Bicycle Chain Lubricants explained, apparently written in 2016 and updated in 2018 and 2021.

BikeRadar is careful and thorough. It ran its Complete Guide to Bike Gears in April 2020, an introduction and overview of drive trains.

CyclingTips was an online cycling magazine with strong technical coverage – until the publisher made changes in 2022. It published a few “endless FAQ” articles on some components and issues of maintaining modern bicycles⁴If they are still online at CyclingTips. These were detailed articles, periodically revised. For instance:

Component or issue	Started	Revised
Disc Brakes	May 2018	August 2019
Tubeless Tires	2019	October 2021
Waxing Chains	August 2020	March 2021

CyclingTips covered chain maintenance, cleaning, lubrication and wear and modern pioneers of testing lubricants and chains in text articles and audio media: CyclingTips NerdAlert podcast was to devoted technical and repair issues. The panelists often mention the cycling industries’s history of selling products that have drawbacks and flaws. Discussions of chain maintenance:

• The March 2018 article “Seeking the holy grail: A fast chain lube that saves you money”;
• The December 2019 article “Finding the best bicycle chain: What over 3,000 hours of testing revealed”;
• The podcast in its Nerd Alert series in August 2021 on chain lube testing;
• [Updated; March 16, 2022, “Finding the best chain lube for your needs“]

CyclingTips was reorganized and downgraded its efforts to creating technical content in 2022. The new Escape Collective entity and team began to produce content in March 2023. Many of the writers and podcast panelists who had produced content for CyclingTips are with Escape Collective.

Jason Smith, an engineer in Boulder, Colorado, USA started and ran a business called Friction Facts in the period from 2012 to 2015. He ran some test on chain lubricants that were publicized in a cycling publication. The story of Friction Facts, efficiency tests and the publication of its efficiency tests results is summarized in Bike Chains 4 in this series, under the heading Efficiency testing.

Adam Kerin, in Adelaide, South Australia, Australia started a business called Zero Friction Cycling (“ZFC”) in 2017. The story of ZFC and durability tests is summarized in Bike Chains 4 in this series, under the headings Efficiency testing and Durability/Wear testing. ZFC has published chain wear and lubrication material on the Web.

Josh Poertner is an engineer, with a wide knowledge of the way bicycle components and supplies are made and marketed. Silca Velo has developed and lubricant products, including products to remove factory grease from chains, other cleaning products, paraffin lubricants, and oil-based lubricants. They will be mentioned Bike Chains 4 and 7. Josh Poertner and other broadcasters hired or sponsored by Silca Velo have done podcasts and videos on the YouTube channels named Silca Velo and “Marginal Gains”:

• video
  • June 2020, Marginal Gains series , Silca Velo YouTube channel, Chain Friction Explained!;
• podcasts
  • interviewing people who test lubes and chains; and
  • about cleaning chains and applying lubricant;
  • Marginal Gains podcast, November 2020 “Lubes & Chains & Marginal Gains”.