cog to get the ratio and see
However if they are too long (e.g. when a chainring is thinner than standard or the bolt is just the wrong length) they tighten against themselves rather than securely clamping the chainring or bashguard. In this instance you can file some material from the face of each bolt to shorten it, or you may need to try a size down.
BCD Guide. The last method is to remove the chainring from your bike and place it on a printout of the BCD guide in the link below. Make sure to print it out in the actual size with no scaling. The just find the circle pattern that lines up with the holes on your chainring.
22 Apr 2015 Chainsets come fitted with chainrings, but cranksets do not. So this is a good starting point of what to look for. If you are looking to upgrade and keep the same size chainrings, then check your current chainset for markings. Your chainrings are likely to have a stamp or writing on them with the number of teeth
Measuring along this imaginary line can sometimes be tricky. Luckily, it's possible to calculate the BCD of a chainring by simply measuring the center-to-center distance of two adjacent bolt holes. With this measurement ("B") you can refer to the table below to identify the corresponding BCD, or use one of the following
This is the measurement of an imaginary circle on the chainring bisecting all the bolt holes. The best way to determine this is by measuring the exact distance (center to center) between 2 adjacent bolt holes. Then find that number on the correct chart below to determine the BCD for your chainring.
Aside from the number of teeth, you may also need to know the Bolt Circle Diameter (BCD) of your chainrings in order to replace with ones of an identical size.
20 Aug 2015 The two main determinants on which size of chainrings you can use is the spider type and Bolt Circle Diameter (BCD). Cranks have either four or five bolt chainring attachment know as the spider. You can't run 5-bolt chainrings on 4-bolt cranks and vice versa. Newer chainsets are 4 bolt while everything else is 5 bolt.
19 Mar 2008 Figuring out what size chainring you have is pretty easy, it's just a matter of knowing what size Bolt Circle Diameter (or BCD) you have. A quick way to find out is to measure the distance between the center of two adjacent bolt holes then refer to the chart below to see what bolt pattern you have. Chainring

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March 2018