The Criterium, 2000, and several other Zeus cranksets had this circle. Even Sutherland's is a little confused about it. I have three different Editions of Sutherland, two say 120 mm, but the other says something different, either 118 mm or 119 mm. One thing I know for sure. The Zeus circle is NOT identical to the nominal 118 mm circle that SR (Japan) used on some of their cranks. The SR rings are slight smaller than Zeus. I know because several years ago I tried fitting SR rings to Zeus crankarms. They were too small, but close enough I tried filing out the holes a bit on the SR rings. The toughest bit was not getting the bolts through, but rather getting the inside of the rings to fit over the lip on the Zeus arms, meaning I had to file the inside edge of the rings. I got them on, but the remaining material between the inside of the bolt holes and the inside edge of the rings was so small I was afraid to ride them. So the Zeus circle is definitely larger. If the SR circle is truly 118 mm, then my guess is Zeus is 120 mm, which is what I always call them. Pity Zeus couldn't make it just 2 mm larger, which would have matched the old 122 mm Stronglight. Both are obsolete now, of course, but it is a heck of a lot easier to find a 122 mm Stronglight ring than a 120 mm Zeus.
Regards,
Jerry Moos Big Spring, Texas, USA
Peter Tutty <peter_tutty@yahoo.com> wrote:
An enquiry re what I believe to be an early 1970's Zeus Criterium chainset, specifically the bolt circle diameter (BCD). Using the late Seldon Brown's centre to centre of chainring bolt multiplied by 1.7 formula I get (within the limits of my ruler and visual accuracy) 118mm. However I've seen a int ernet reference to a 120mm BCD.
What do list members know?
Thanks in anticpation.
Peter Tutty
Londonderry, NSW, Australia. =0A=0A=0A