S
slug
Guest
So, here's what I've gathered so far:
- You need precise cable pull amounts to shift internally-geared hubs.
- STI/Ergo shifters are precisely indexed for the cable pull necessary to
shift their corresponding derailers.
- If you can find the initial pull-per-click of an indexed shifter, there
are 2 ways you can probably change it:
- 1: replace the notched detent plate with a freshly-machined one with
new notches in it (assuming the initial total cable pull of the device
covers a wide enough range for the intended new amount)
- 2: leave the shifter unmodified and come up with some kind of lever
(bellcrank) to modify the amount of pull between the shifter and the
cable anchor (this assumes the target setting needs the same amount
of pull for each click)
- I can fairly easily find out the cable-pull specs of various indexed
shifters designed for derailers.
So this whole conversion thing may be do-able if I can find out how much
Nexus shifters pull, both per click, and over their range. I haven't had any
luck with this.
Do any of y'all out there have the details?
thanks.
Y.
On 3/4/04 10:56 PM, in article
BC6D64A1.3077%[email protected], "slug"
<[email protected]> wrote:
> Is there any really important reason why one shouldn't use a friction
> shifter with an internally-geared hub? I've been thinking about building a
> 7- or 8-speed coaster-brake nexus onto a 700c rim and throwing it onto a
> road frame with mustache bars. In the image in my head, it just looks best
> with a barcon.
....
- You need precise cable pull amounts to shift internally-geared hubs.
- STI/Ergo shifters are precisely indexed for the cable pull necessary to
shift their corresponding derailers.
- If you can find the initial pull-per-click of an indexed shifter, there
are 2 ways you can probably change it:
- 1: replace the notched detent plate with a freshly-machined one with
new notches in it (assuming the initial total cable pull of the device
covers a wide enough range for the intended new amount)
- 2: leave the shifter unmodified and come up with some kind of lever
(bellcrank) to modify the amount of pull between the shifter and the
cable anchor (this assumes the target setting needs the same amount
of pull for each click)
- I can fairly easily find out the cable-pull specs of various indexed
shifters designed for derailers.
So this whole conversion thing may be do-able if I can find out how much
Nexus shifters pull, both per click, and over their range. I haven't had any
luck with this.
Do any of y'all out there have the details?
thanks.
Y.
On 3/4/04 10:56 PM, in article
BC6D64A1.3077%[email protected], "slug"
<[email protected]> wrote:
> Is there any really important reason why one shouldn't use a friction
> shifter with an internally-geared hub? I've been thinking about building a
> 7- or 8-speed coaster-brake nexus onto a 700c rim and throwing it onto a
> road frame with mustache bars. In the image in my head, it just looks best
> with a barcon.
....