Topic starter
i've got and old ultgra chainset and i want to replace the rings but the old rings have no indication of size, not sure of the year either, they are octalink so not too modern, how do i measure the BCD?
Posted : 03/09/2009 11:52 am
They're 130mm, all non-compact Shimano road cranks are. Campag are 135, compact are smaller, could be 110.
Posted : 03/09/2009 11:54 am
Topic starter
wonderful!
cheers
Posted : 03/09/2009 11:56 am
Here is a link from the Blackspire website
[url= http://www.blackspire.com/site_assets/www.blackspire.com/images/dynamic/BCD%20Guide.pdf ][/url]Here is a link from the Blackspire website
Posted : 03/09/2009 11:56 am
Measure from the centre of the crank to the centre of one of the chainring bolts and double it to get the BCD
Posted : 03/09/2009 1:48 pm