Overview Chat Bike Members News Women
Viewing 5 posts - 1 through 5 (of 5 total)
  • measuring bolt circle diameter
  • rOcKeTdOg
    Full Member

    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 14 years ago
    njee20
    Free Member

    They're 130mm, all non-compact Shimano road cranks are. Campag are 135, compact are smaller, could be 110.

    Posted 14 years ago
    rOcKeTdOg
    Full Member

    wonderful!

    cheers

    Posted 14 years ago
    mojo5pro
    Free Member

    Here is a link from the Blackspire website

    [/url]Here is a link from the Blackspire website

    Posted 14 years ago
    bigyinn
    Free Member

    Measure from the centre of the crank to the centre of one of the chainring bolts and double it to get the BCD

    Posted 14 years ago
Viewing 5 posts - 1 through 5 (of 5 total)

The topic ‘measuring bolt circle diameter’ is closed to new replies.

Overview Chat Bike Members News Women