Take the 2-minute tour ×  Are there any special types out there
or are they pretty much all the same?  share|improve this
question What type of bike, gearing, etc... You can use tags to
specify type of bike, and gearing. –  Andrew Lowe Sep 2 '10 at
8:51  2 Answers 2  up vote 5 down vote accepted  The two most
common sizes are 3/32" and 1/8" Generally you would use 3/32"
for bicycles which have dérailleur gears (road/mountain bikes).
As for length I believe they are all a stock length and you'll
be very unlucky if you find it is too short. You will need to
specify how many speeds your freewheel or cassette is
(6/7/8/9/10 speed).  You will obviously find lots of variety in
quality/weight/material/price etc when you know which type of
chain to look at.  share|improve this answer Be aware that these
aren't the only widths though. Before you buy anything check it
is compatible with the manufacturer of your cassette (Shimano,
Campagnolo, SRAM etc) and the number of cogs (5,6... 10,11
speed). –  Duncan McGregor Feb