Shimano rd m-900?

Is this a 9-speed derailleur? Or not?

thanks.

On Sep 5, 9:09*pm, Fester Bestertester wrote:
Is this a 9-speed derailleur? Or not?

thanks.

Not designed to be, but no reason it won't work. Cable pull ratio's
the same.

Not designed to be, but no reason it won't work. Cable pull ratio's
the same.

I know so little about derailleur science. Isn't the range (low to high) a
limitation? If it's an 8 speed, won't its range be too "narrow" for a 9s
cassette?

Thanks.

On Sep 6, 12:39*am, Fester Bestertester wrote:
Not designed to be, but no reason it won't work. Cable pull ratio's
the same.

I know so little about derailleur science. Isn't the range (low to high) a
limitation? If it's an 8 speed, won't its range be too "narrow" for a 9s
cassette?

Not if the limit screws come out far enough.

I've shifted a 9sp cassette with a 1980s Huret
derailer that was meant for 5sp. Indexing didn't
work, and I couldn't get it into the biggest rear
sprocket, but if I'd taken a file to the body I
could have made it reach. But I mean if you
can't get up a hill in 39:21, you can't get up
that hill.

On Sep 5, 9:39*pm, Fester Bestertester wrote:
Not designed to be, but no reason it won't work. Cable pull ratio's
the same.

I know so little about derailleur science. Isn't the range (low to high) a
limitation? If it's an 8 speed, won't its range be too "narrow" for a 9s
cassette?

Thanks.

C-C cog spacing is narrower on a 9-speed cassette than an 8-speed.
Both cassettes mount on the same freehub body and have the same frame
spacing. They'll both cover the same range.

C-C cog spacing is narrower on a 9-speed cassette than an 8-speed.
Both cassettes mount on the same freehub body and have the same frame
spacing. They'll both cover the same range.

Doh! I knew that...

Thanks!

On 6 Sep, 05:48, Norman wrote:
On Sep 6, 12:39*am, Fester Bestertester wrote:

Not designed to be, but no reason it won't work. Cable pull ratio's
the same.

I know so little about derailleur science. Isn't the range (low to high) a
limitation? If it's an 8 speed, won't its range be too "narrow" for a 9s
cassette?

Not if the limit screws come out far enough.

Limit screws always come out far enough, use a screwdriver until they
fall out.


I've shifted a 9sp cassette with a 1980s Huret
derailer that was meant for 5sp. *Indexing didn't
work, and I couldn't get it into the biggest rear
sprocket, but if I'd taken a file to the body I
could have made it reach.

Or just bent the tab if it was a steel mech, I did this with an Allvit
(or mabe it was a Svelto) over a 7speed (it was a Huret meant for 1/8"
sprockets, so old 4 speed), just chucked the set screws and set the
limits by bending the stops.

*But I mean if you
can't get up a hill in 39:21, you can't get up
that hill.

A 26 to 28 is nice to use with a 39 a 31 or 32 as reserve. I dont
really need a 13t never mind a 12 or a god forsaken 11tooth. I like a
full set of dentures, 32 teeth available so a I can gently chew up
them hills. No good using half my gnashers and wearing them out
because of overloading.

On 9/5/2009 9:39 PM, Fester Bestertester wrote:
Not designed to be, but no reason it won't work. Cable pull ratio's
the same.

I know so little about derailleur science. Isn't the range (low to high) a
limitation? If it's an 8 speed, won't its range be too "narrow" for a 9s
cassette?

Thanks.

no