Chain rings

Fri, 27 Feb 2004 21:25:49 -0000,
<[email hidden]>, "Neil Smith"

Quoted message said:

The bike shop having trouble selecting replacement rings for my chainset and they were talking
"Pitch". How do you establish which type of ring is required for a particular chain ring. The old
one, I suspect very old is Suigino Comp super-shifter. Would anyone how to find the size by which
I could find something similar? Also I am thinking of going for a larger large ring, moving up
from 48 to 50 or 52. What will be the sizes for the other two rings. I believe that I will have to
adjust the front derailleur. How to I determine, apart from the hard way, the correct position?

Forget "pitch". All the chains today are half-inch "pitch". They're
3/32" or 1/8" wide. The "pitch" of the sprocket can change through wear but they all start out the
same. sheldonbrown.comchains.htmlOpen ↗

The variety of chainrings has mostly to do with the "bolt circle diameter". You can measure the
distance between holes and look here to determine what size it is.
sheldonbrown.comchainrings.htmlOpen ↗

Yes, you'll have to reposition the front derailleur. As long as it's not brazed on or attached to
a plate crammed onto the BB, it's an easy job to just slide up or down the seat tube and adjust
the cable..
--
zk