won't shift to granny

Mike, the DA 9-speed triple 7703 has a 53t large chainring. So, you
have 53/39/30.

I have about 3700 miles on my DA crankset and I have never had it dump
off from the middle chainring. Is this a problem that shows up with
use and wear, or if it is going to be a problem, does it happen right
from new?

One more thing to worry about?

If it works fine, don't worry about it. Shimano came out with a "new &
improved" middle chainring that was supposed to make things better and, in
many cases, it did. There was also an issue with lever action being a bit
stiff, so that the amount of body english you put into shifting was in
itself disruptive and helped derail the chain.

Make sure you replace the chain before it wears too much, and you should be
OK.

--Mike-- Chain Reaction Bicycles
www.ChainReactionBicycles.com


"Jeff Starr" wrote in message
...
On Wed, 04 May 2005 15:56:28 GMT, "Mike Jacoubowsky"
wrote:


With the DuraAce 9-speed triple (with 52/39/30), Shimano tried to get
around
this by cutting down the profile of the teeth on the middle chainring.
Unfortunately, it was/is legendary for dumping the chain off the middle
chainring as you're "just riding along." The shifting was terrible
compared
to the Ultegra 52/42/30. However, for the new Ultegra 10, they seem to
have
gotten their act together and the 52/39/30 shifts quite nicely. Dramatic
improvement. But it also has a highly-convoluted middle chainring that
would
be difficult to duplicate with your dremel tool, *and* will probably wear
out more quickly too.

Please note these problems are exacerbated by STI shifting, which doesn't
allow you to control the shifting process as much as Ergo or friction.
They're also far pickier about chain choice and, I daresay, if you're
using
an SRAM chain, you may have better results with a Shimano.

--Mike-- Chain Reaction Bicycles
www.ChainReactionBicycles.com



Mike, the DA 9-speed triple 7703 has a 53t large chainring. So, you
have 53/39/30.

I have about 3700 miles on my DA crankset and I have never had it dump
off from the middle chainring. Is this a problem that shows up with
use and wear, or if it is going to be a problem, does it happen right
from new?

One more thing to worry about?


Life is Good!
Jeff

Tim Lines wrote:
Qui si parla Campagnolo wrote:

Perhaps the 6603 front der which is designed for a 39t middle ring,
with the appropriate ramps to get the chain to the granny.


OH!

Last week I got a 6603 fd and was really surprised to find that it
was
incompatible with my old 105 triple crank and chainrings (42t
middle).
Now I know why it didn't work. Thanks!

Yep, we have diffuculty finding 6503 front ders, since the 6603, 7703,
7803 and probably the 105 level 10s triple, won't work well with their
older triple cranks...another thanks to shimano!!!

Qui si parla Campagnolo wrote:
Tim Lines wrote:

Qui si parla Campagnolo wrote:


Perhaps the 6603 front der which is designed for a 39t middle ring,
with the appropriate ramps to get the chain to the granny.


OH!

Last week I got a 6603 fd and was really surprised to find that it

was

incompatible with my old 105 triple crank and chainrings (42t

middle).

Now I know why it didn't work. Thanks!


Yep, we have diffuculty finding 6503 front ders, since the 6603, 7703,
7803 and probably the 105 level 10s triple, won't work well with their
older triple cranks...another thanks to shimano!!!


But Campy Mirage worked out fine, thanks. It was in my box-o-stuff so
that's what I ended up with.