Install STI shifters on old bike?

On Thu, 3 Dec 2015 10:51:06 -0800 (PST), "
wrote:

On Wednesday, December 2, 2015 at 4:32:40 PM UTC-6, Doug Landau wrote:

Sheldon said derailleurs don't care, and the ancient barcons on my S10-s shifted the 7-speed rear wheel that I swapped in there just fine.


Not sure when Sheldon Brown died, but he may have been dead a couple decades now. Today the shifter, Shimano, SRAM, Campagnolo, and the number of cogs on the cassette matter. They all shift the derailleur a slightly different amount based on how much lever travel and cable pull and rear derailleur angle. If you narrow it down to 10 speed, then mix up the brands of 10 speed shifter and 10 speed rear derailleur, it will not work. And sometimes you have to even make sure you use a 10 speed rear derailleur with a 10 speed shifter. Cannot use a 9 speed rear derailleur with 10 speed or 11 speed shifters. Its best if everything matches exactly. With new click systems, you are trying to fit 9 or 10 or 11 cogs in the same space that 7 speed used to go. Every tenth or hundredth of a millimeter matters. Your ancient 7 speed barends and derailleurs probably did not care if you moved the lever 1 or 5 millimeters on every shift.

But Sheldon was not talking about a rear derailer and an indexed
shifter. He was talking about a rear derailer and a cassette.

And, he was perfectly correct that the derailer doesn't care what
cassette it is used with. I've used, for example, the same rear
derailer with 7 and 10 speed cassettes with out any problems.
--

Cheers,

John B.

On Thu, 3 Dec 2015 21:41:43 +0000 (UTC), David Scheidt
wrote:

Doug Landau wrote:
:On Thursday, December 3, 2015 at 10:51:09 AM UTC-8, wrote:

:Yes you can. Derailleurs don't care. The indexing is done in the shifter.

For 9 speed and less, that's pretty much true, as long as your
shifters are the same brand as the derailleur. 10 and 11, not so
much. The indexing is done in the shfiter, yes, but how much swing a
mm of cable pull (which is how the shifters index) gets you changes.

Sheldon's been dead for 7 years, things change.

Strange then that I've used the same rear derailer for cassettes
ranging from 7 to 10 speed with no problems what so ever.
--

Cheers,

John B.

:Yes you can. Derailleurs don't care. The indexing is done in the shifter.

For 9 speed and less, that's pretty much true, as long as your
shifters are the same brand as the derailleur. 10 and 11, not so
much. The indexing is done in the shfiter, yes, but how much swing a
mm of cable pull (which is how the shifters index) gets you changes.

Sheldon's been dead for 7 years, things change.

Fortunately the stock suntour derailleur on the aforementioned bike dates from when he was alive.

On 12/3/2015 5:49 PM, John B. wrote:
On Thu, 3 Dec 2015 21:41:43 +0000 (UTC), David Scheidt
wrote:

Doug Landau wrote:
:On Thursday, December 3, 2015 at 10:51:09 AM UTC-8, wrote:

:Yes you can. Derailleurs don't care. The indexing is done in the shifter.

For 9 speed and less, that's pretty much true, as long as your
shifters are the same brand as the derailleur. 10 and 11, not so
much. The indexing is done in the shfiter, yes, but how much swing a
mm of cable pull (which is how the shifters index) gets you changes.

Sheldon's been dead for 7 years, things change.

Strange then that I've used the same rear derailer for cassettes
ranging from 7 to 10 speed with no problems what so ever.
--

Cheers,

John B.


For many (not all) Shimano products that's true. Throw in a
different rear changer geometry and things are very different.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

On Fri, 04 Dec 2015 07:41:21 -0600, AMuzi wrote:

On 12/3/2015 5:49 PM, John B. wrote:
On Thu, 3 Dec 2015 21:41:43 +0000 (UTC), David Scheidt
wrote:

Doug Landau wrote:
:On Thursday, December 3, 2015 at 10:51:09 AM UTC-8, wrote:

:Yes you can. Derailleurs don't care. The indexing is done in the shifter.

For 9 speed and less, that's pretty much true, as long as your
shifters are the same brand as the derailleur. 10 and 11, not so
much. The indexing is done in the shfiter, yes, but how much swing a
mm of cable pull (which is how the shifters index) gets you changes.

Sheldon's been dead for 7 years, things change.

Strange then that I've used the same rear derailer for cassettes
ranging from 7 to 10 speed with no problems what so ever.
--

Cheers,

John B.


For many (not all) Shimano products that's true. Throw in a
different rear changer geometry and things are very different.

grin Years and years ago I built a new bike in Singapore and decided
on this new innovation "indexed shifting". While talking to the bike
shop owner about the group set, I was leaning toward the Italian
Brand, the Bike shop guy said, "if you want it to click use Shimano".
I did and it did and I've used Shimano ever since :-)

Although I did mourn the "spiffy" Italian brakes (which I later
learned that while sexy looking didn't stop especially well).
--

Cheers,

John B.