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31 Questions : 31 Answers

Q&A for Chainrings category

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Gender: Male
Attitude: Just for Fun
9 months ago
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helicopter
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
9 months ago
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CRCJames
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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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1 week, 4 days ago
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skiiter2
Newcastle-u-Tyne,GB
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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 !!
Age: 45 to 54
Gender: Male
Attitude: Just for Fun
10 months ago
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ApacheChief
Cheltenham,GB
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Answer: 
No
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10 months ago
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DFFREITAS
São Paulo,BR
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Age: 55 to 64
Gender: Male
Attitude: Just for Fun
10 months ago
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bosun
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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.
10 months ago
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CRCAndyC
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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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9 months ago
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Ants
Rotorua,NZ
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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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9 months ago
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CRCAndyC
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Age: 45 to 54
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9 months ago
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mickerv
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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8 months ago
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CRCAndyC
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1 answer

Chainring

Hi,
I need a new 10 speed 38t Chainring for a XT chain set.
Cant's find one.
8 months ago
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Daro
Holmbush,GB
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Answer: 
The suggested chainring is compatible with Shimano XT cranksets.
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8 months ago
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CRCAndyC
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I want to convert my Shimano XT FC-M780 with a 36/11 Cassette from 3x10 to 2x10 setup and want to use a 38/24 front set up. Not sure if I can mix and match Shimano components or would you recommend using offerings from Blackspiere, Hope etc?
Thanks!
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8 months ago
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Alex1977
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Answer: 
Shimano chainring's can be used; however an upgrade to Blackspire chainring's will complement the new drivetrain setup and are long lasting, hard wearing chainring's.
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Blackspire Super Pro Middle Ramped
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8 months ago
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CRCAndyC
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7 months ago
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sideshow
settle,GB
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Answer: 
Sorry for any confusion caused.

There is a small formula for working out a BCD from the actual bolt hole distance dimension (in this case the number you have measured is 45.3mm..

Multiplying this dimension by 1.701 will give you the actual BCD for a 5-bolt chainring.

Use 1.155 for 3-bolt chainrings, 1.414 for 4-bolt chainrings and 2.000 for 6-bolt chainrings.

So by multiplying 45.3mm by 1.141 will give the 64mm BCD required for the 4-bolt chainring required.
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7 months ago
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CRCAndyC
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1 answer

types of chainrings

I have got a triple Shimano 52-39-29 set on my bike and want to replace one of them (52 or 29) with a 34 t.
What is the difference between a compact, double or triple chainring and what do you advise me ?
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6 months ago
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Deltach
TROIS MONTS,FR
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Answer: 
Different chainset gear ratios seen on Triple or Double standard or compact chainsets will denote the overall gearing feel of your drivetrain along with the cassette ratio that you are using. Depending on what your riding style/application is will help determine what gearing styles will be best suited for you.
A triple chainset offers you a different range of most gears when compared to a Double chainset etc.
Normal standard gearing chainsets will have chainrings that have a 130mm BCD usually and have larger tooth counts than what you will see on Compact Gearing chainsets that run smaller BCD sizes of 110mm.

You ideally want to get a gearing set up for chainset and cassette that matches how/what you ride.
6 months ago
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CRCMickael
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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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6 months ago
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bigman
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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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5 months, 4 weeks ago
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CRCAndyC
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WHEN BUYING  Chainrings, ALSO CONSIDER

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