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==Chain standards==
[[Standards organization]]s (such as [[ANSI]] and [https://www.iso.org/committee/50982/x/catalogue/ ISO]) maintain standards for design, dimensions, and [[interchangeable parts|interchangeability]] of transmission chains. For example, the following Tabletable shows data from ANSI standard B29.1-2011 (Precisionprecision Powerpower Transmissiontransmission Rollerroller Chainschains, Attachmentsattachments, and Sprocketssprockets)<ref name="ASME B29.1-2011">[https://www.asme.org/products/codes-standards/b291-2011-precision-power-transmission-roller ASME B29.1-2011 - Precision Power Transmission Roller Chains, Attachments, and Sprockets].</ref> developed by the [[American Society of Mechanical Engineers]] (ASME). See the references<ref>{{cite book | title=The Complete Guide to Chain | editor=Tsubakimoto Chain Co. | editor-link=Tsubakimoto Chain Co. | publisher=Kogyo Chosaki Publishing Co., Ltd. | isbn=0-9658932-0-0 | year=1997 | pages=240 | id=p. 86 | url=http://chain-guide.com/applications/1-1-1-ansi-roller-chains.html | access-date = 30 January 2015 | chapter=Transmission Chains | chapter-url=http://chain-guide.com/applications/1-transmission-chains.html }}</ref><ref name="MachinerysHandbook25epp2337-2361">{{Harvnb|Green|1996|pp=2337–2361}}</ref><ref>{{cite web |title=ANSI G7 Standard Roller Chain - Tsubaki Europe |url=http://tsubaki.eu/chain/ansi-standard-roller-chain/#Single |work=Tsubaki Europe |publisher=Tsubakimoto Europe B.V. |access-date=18 June 2009}}</ref> for additional information.
{| border="0" cellpadding="6" cellspacing="0"
|- style="background:#232e6d;font-weight:bold; color:white; "
|colspan="8" |ASME/ANSI B29.1-2011 Roller Chainchain Standardstandard Sizessizes
|- style="background:#336ead;font-weight:bold; color:white; "
!Size
!Pitch
!Maximum Rollerroller Diameterdiameter
!Minimum Ultimateultimate Tensiletensile Strengthstrength
!Measuring Loadload
|-style="background:#eaeaea;" align=right
!align=center|25
| 1 || {{frac|'''8'''|8}} || '''8'''0 || {{frac|5|8}}
|-
| colspan="4" | Notes:<br /> 1. *The pitch is the distance between roller centers. The width is the distance between the link plates (i.e. slightly more than the roller width to allow for clearance).<br /> 2. *The right-hand digit of the standard denotes 0 = normal chain, 1 = lightweight chain, 5 = rollerless bushing chain. <br /> 3. *The left-hand digit denotes the number of eighths of an inch that make up the pitch. <br /> 4. *An "H" following the standard number denotes heavyweight chain. A hyphenated number following the standard number denotes double-strand (2), triple-strand (3), and so on. Thus 60H-3 denotes 3/4 inch pitch heavyweight triple-strand chain.
|}
A typical bicycle chain (for [[derailleur gears]]) uses narrow {{frac|1|2}}-inch-pitch chain. The width of the chain is variable, and does not affect the load capacity. The more sprockets at the rear wheel (historically 3–6, nowadays 7–12 sprockets), the narrower the chain. Chains are sold according to the number of speeds they are designed to work with, for example, "10 speed chain". Hub gear or single speed bicycles use 1/2" x 1/8" inch chains, where 1/8" inch refers to the maximum thickness of a sprocket that can be used with the chain.
Typically chains with parallel shaped links have an even number of links, with each narrow link followed by a broad one. Chains built up with a uniform type of link, narrow at one and broad at the other end, can be made with an odd number of links, which can be an advantage to adapt to a special chainwheel-distance; on the other side such a chain tends to be not so strong.
Roller chains made using ISO standard are sometimes called as "isochains".
==See also==
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