"Neil Smith" <
[email protected]> wrote:
> 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?
You're going to have to clarify what you mean by "ring" in the first instance.
> 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.
You can probably make a change of 2-4 teeth on the big ring without replacing the other rings. If
you intend to replace them anyway, the best thing to do from a front derailleur standpoint is to
maintain the same intervals between rings, e.g 28-38-48 -> 30-40-50 or 32-42-52. However, I have
never had a problem using a larger big ring, and the ratio between a 28 and a 38 is the same as
between a 38 and a 52. I think it's nice to have the same size step between successive rings.
> I believe that I will have to adjust the front derailleur. How to I determine, apart from the hard
> way, the correct position?
Yes, you'll have to move it upwards along the seat tube to clear the larger ring. Detach the cable
first. With an older front derailleur that has a mostly flat outer cage, just set the derailleur so
that the outer plate is parallel to the big ring, and so that it clears the teeth on the big ring by
about 1.5mm when it is swung through its motion. Verify that your limit stops are set appropriately,
and reattach the cable.
Chalo Colina
