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what is the difference between 130bcd and 144bcd ?

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yeah I'm kinda confused about the 130bcd and 144bcd, whats the difference about it ? is it the size or the feel or what ?
     
July 23, 2013 06:29 AM
dimas_s
From: Jakarta, Indonesia
20 posts
2 bikes
different dimension on the chainring and cranks.

144 bcd is only for track cranks
and 130 bcd is usually for road crank.

some track cranks use 130 bcd, like sram s100/s300, sugino messenger, shimano alfine, and some other track cranks.

if you have a road crank, with the right bcd chainring, with a smaller chainring bolts, you can have a alternative track/ss crank. like my gf's bike, i bought her a shimano tiagra double crank, but replaced the double chainring with a fsa chainring (it has a offset, which gave it a perfect chain alignment)
     
July 23, 2013 07:31 AM
14 millimeters.
BCD is bolt circle diameter. The distance from the center of the crank spindle to the center of the chainring bolt is the radius. Double that and you have the diameter, BCD.
There are other sizes and there is also 4 bolts for BMX and mountain bikes. Road and track use five.
     
July 23, 2013 07:49 AM
AKfromGC
From: Gold Coast. Australia
179 posts
2 bikes
so if i have the wrong bcd, the crank won't fit the bike ?
     
July 24, 2013 04:55 AM
dimas_s
From: Jakarta, Indonesia
20 posts
2 bikes
No. The chain ring will not fit the crank arm.
     
July 24, 2013 06:07 AM
Rushing
From: Las Vegas, NV
372 posts
3 bikes
i see, okay thanks !!
     
July 25, 2013 10:19 AM
dimas_s
From: Jakarta, Indonesia
20 posts
2 bikes
Wow that kind of made me understand too thanks guys.
     
August 9, 2013 11:35 PM
uniquetop
From: Los Angeles, CA
14 posts
1 bike

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