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Q&A for Chainrings category

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1 year ago
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Yamba,AU
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Answer: 
The bolt circle (BCD) refers to the distance between the bolt holes on the chainring. This is important as chainrings and cranks can have different bolt spacings.

The way to identify your current crank/chainring BCD is to get a ruler and measure the center to center of two adjacent bolt holes.

45.3mm measured will equal a 64mm BCD the most common for 22t size.

If you need further help with this please email us at

tech@chainreactioncycles.com
1 year ago
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Answer: 
In a four hole system such as SRAM the BCD (bolt circle diameter) is simply the distance between the hole centres of two opposite holes and is best measured from the outer edge of one hole to the inner edge of the opposite hole.

Five hole systems such as Shimano are more complicated.

1. Measure the distance between adjacent holes. Call this distance C.

2. Then the BCD is given by: BCD = C/sin(180/N) where N is the number of holes.
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3 months, 2 weeks ago
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Newcastle-u-Tyne,GB
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Small chainring size

İ have Shimano m-411 triple crank 28x38x48, 8speed. İ would like to fit a 26t inner ring, would a 9sp ring be ok, or could you recommend one?.
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9 months ago
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Answer: 
The suggested chainring below is designed for use with 8/9-speed drivetrains and is compatible with the M411 crankset.
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9 months ago
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Answer: 
you can select any ring with BSD=64mm
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2 weeks, 5 days ago
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Truvativ 9 speed inner chain ring

Hi. I have a Boardman Road Comp. It runs a 9 speed Truvativ Elita chain ring (50/36). I want to swap the inner to a 34 tooth. Is there anything that will fit?
1 month ago
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Answer: 
Unfortunately at present we do not have a 130mm BCD chainring with a 34tooth count.
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1 month ago
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Answer: 
You can choose from Shimano with BСD110mm example Tiagra or 105
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2 weeks, 2 days ago
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Chainrings

I have an Ultegra SG-X 50/34t FC-6750 compact set. Am I able to fit a 52 or 53t ring instead of the 50t? And if so, which will fit?
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3 weeks, 1 day ago
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christchurch,NZ
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Answer: 
Unfortunately this would not be possible as the Bolt Circle Diameters are different between 'Compact' and 'Double' crankset gear ratios.

The chainrings cannot physically fit to the crankset.
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2 weeks, 6 days ago
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Answer: 
Shimano does not produce stars at 110mm (for a compact) more than 50T, but you can find and use other manufacturers. For example BBB or FSA. but pay attention to BCD = 110mm
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2 weeks, 2 days ago
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8 months ago
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dundee,GB
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Answer: 
As long as the BCD and hole count on the chainring matches that on your crank spider, you should be ok to use different brands with different cranks. Some cranks have specific BCD/ Spider alignment; if you drop us an email with details of your crank (model, year etc) we will be able to have a closer look for you. http://www.chainreactioncycles.com/...
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8 months ago
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I wish to buy steel 36 & 44t chainrings to go with a 10 speed 12-25 cassette.
Is there a standard chainset and cassette.

My Russian is not perfect but I think this is what he is asking. Hope I'm being helpful !!
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1 year, 1 month ago
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Answer: 
No
Age: 25 to 34
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1 year, 1 month ago
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São Paulo,BR
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Age: 55 to 64
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1 year, 1 month ago
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Answer: 
If the BCD is the same, then the chainring will fit. However; it is advised to use the intended manufacturers chainrings to guarantee spacing and smooth shifting.
1 year, 1 month ago
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I need a 10 speed XT m785 26 tooth 64 bcd chainring-There does not appear to be this specific chainring available at the mo on the CRC site - but you have a M770 26 t 64 bcd inner chainring which looks the same- but is a 9 speed. Will this chainring work on a 10 speed crankset and with 10 spd chain?

Thanks
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Answer: 
The tooth profile on a 9-speed chain ring is too wide for a 10-speed chain to run efficiently and is not a recommended combination.

The suggested chain rings below are both 10-speed compatible.
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1 year ago
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Age: 45 to 54
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1 year ago
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Lurgan,GB
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Answer: 
As the crankset that comes supplied with the Sommet 1 is the Truvativ Descendant 1.1 (with a Bolt Circle Diameter of 104mm); there are many chainring options.
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11 months ago
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Chainring

Hi,
I need a new 10 speed 38t Chainring for a XT chain set.
Cant's find one.
1 year ago
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Holmbush,GB
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Answer: 
The suggested chainring is compatible with Shimano XT cranksets.
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1 year ago
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