What does it mean?

HI Guys,

I am busy building my first SS. My next purchase is a chainring. What's the difference between 130 BCD & 144 BCD?

http://www.sheldonbrown.com/gloss_bo-z.html
give this a read sir.

they're different sizes and so fit different cranks. It relates to the bolt pattern diameter of the spider, although the way in which it is measured is a bit obscure and i can't remember... Solution? find out what BCD your cranks are and then get a chainring to match.

bolt centre diameter
the distance from the centre of the spindle to where the chainring bolts go
i guess it all relates to the length of the spider arms on the crank

Thanks guys.

Cheers, will measure my crank.

or let us know what crank it is and we should be very easily be able to find out what the bcd is.

Shimano FC-A500 170mm. I would also like to know what 16t I can put at the back :)

14 bcd.

135

Sorry for being dense but what does the 14bcd mean?

Sorry for being dense but what does the 14bcd mean?

difference between 130 BCD & 144 BCD

.

Sheldon!

Ag nee man. Poephol ! :-P

jou ma se poes

from sugino

thanks Ved. picture good!!!!

HI Guys,

I am busy building my first SS. My next purchase is a chainring. What's the difference between 130 BCD & 144 BCD?

i think the word you're looking for is 'assembling'.

bolt centre diameter
the distance from the centre of the spindle to where the chainring bolts go
i guess it all relates to the length of the spider arms on the crank

It's bolt circle diameter actually.

And it's not from the centre of the bb spindle to the chainring bolt - that would be the radius, not the diameter.

It's the width of an imaginary circle whose line goes through all the chainring bolts.