Switching from a triple to a double - Front brifter issue?

[Anthony A.]

I recently purchased a lightly used cross bike with a 105 group, and a
Truvativ triple crankset.
I'd like to switch to a double, compact. I see that the 105 left
brifter is listed at double/triple compatible - but I don't really
undertsand how this is so.
Do I need to make some mechanical change to the shifter? Or do I just
set the limit screws on the front mech so that I only use part of the
cable travel available on the brifter? Or is there some other
recomended method?
Also, is a new front mech called for?
Thanks in advance for any help.

 

[[email protected]]

Limit screws should do the trick- that's what I did. Depending on the
top ring size of the compact ring you may need a Deore or similar FD. I
found a 50T top ring would work OK with the 105 derailleur but to get a
46T working reliably I had to use a Deore bottom pull- which
fortunately was very cheap.

 

[Sheldon Brown]

Anthony A. wrote:

> I recently purchased a lightly used cross bike with a 105 group, and a
> Truvativ triple crankset.
> I'd like to switch to a double, compact. I see that the 105 left
> brifter is listed at double/triple compatible - but I don't really
> undertsand how this is so.

It is not possible to make a triple shifter or derailer that won't also
work on a double, since 2 is a subset of 3.

> Do I need to make some mechanical change to the shifter?

No..

> Or do I just set the limit screws on the front mech

Right, set the limit screws in the usual manner, there's no special
magic required.

Sheldon "http://sheldonbrown.com/derailer-adjustment" Brown
+------------------------------------+
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Phone 617-244-9772 FAX 617-244-1041
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[Anthony A.]

Thnaks Justin & Sheldon - it seemed like it was that easy, but I wanted
to make sure that i wasn't missing something.

_A.

 

[RonSonic]

On 15 Apr 2005 04:23:01 -0700, "Anthony A." <[email protected]> wrote:

>Thnaks Justin & Sheldon - it seemed like it was that easy, but I wanted
>to make sure that i wasn't missing something.

I'm with you on the paranoia. It is never that easy. Unless, sometimes, just to
mess you up, it is just that easy.

Ron