please explain "trim" feature on front derailer

What about on the DuraAce? I have a DA triple fdr and I *think* I have a
working trim??? Either that, or something needs adjusting possibly.

Sorry, didn't want to confuse the original poster by pointing out that
DuraAce triple has "trim" on all three chainrings, while the rest of the
line only has it on the smaller two. So yes, you have even more "trim" than
the others.

--Mike-- Chain Reaction Bicycles
http://www.ChainReactionBicycles.com

What about my Conti's which have both "Recommended" pressures (95psi)
and max (120 psi) pressures? I run them at 115 for everyday riding
and really like the way they feel (I weigh 185).

If you're talking 23c, 120psi absolutely. On a 25c tire, probably no big
deal at 115 (but I'd still run at full rated pressure), and on a 28c tire
you'll have a bit of a safe range.

The "recommended" pressure is an absolute minimum, and also, I believe,
one-half the tested blow-off psi (in other words, it may be determined for
safety reasons that have nothing to do with normal riding).

--Mike-- Chain Reaction Bicycles
http://www.ChainReactionBicycles.com

Mike Jacoubowsky wrote:

What about on the DuraAce? I have a DA triple fdr and I *think* I have a
working trim??? Either that, or something needs adjusting possibly.

Sorry, didn't want to confuse the original poster by pointing out that
DuraAce triple has "trim" on all three chainrings, while the rest of the
line only has it on the smaller two. So yes, you have even more "trim" than
the others.

Does this work well enough so that you don't get chain-to-cage rub in
any of the 3x9 gear combinations, even the cross-chain ones like largest
chainring to large rear cog, or smallest chainring to smallest rear
cog? I don't use these, but I'm thinking about Dura-Ace triple for my
next bike, and I would like to *eliminate* chain rub entirely if I'm
going to be laying out that kind of $$$. I hate chain rub.

Dave

In article m,
says...
What about my Conti's which have both "Recommended" pressures (95psi)
and max (120 psi) pressures? I run them at 115 for everyday riding
and really like the way they feel (I weigh 185).

If you're talking 23c, 120psi absolutely. On a 25c tire, probably no big
deal at 115 (but I'd still run at full rated pressure), and on a 28c tire
you'll have a bit of a safe range.

These are 700x25c. I just put them on a couple of days ago, so I
wanted to be sure everything was seated properly before I ran them all
the way up, but they feel very nice at 115, so I may leave them there
until I get to the race next month. Except for the very slight
vibration from the surface texture of the pavement, they seem to be
just as smooth at that pressure as the older 32's did at 80 psi
(over small bumps, manhole covers, etc). They are certainly quieter
than the old ones were. Maybe because of a stiffer casing on the
32's?


The "recommended" pressure is an absolute minimum, and also, I believe,

OK. That's kind of they way I was approaching it, but wasn't sure.


one-half the tested blow-off psi (in other words, it may be determined for
safety reasons that have nothing to do with normal riding).

--
Dave Kerber
Fight spam: remove the ns_ from the return address before replying!

REAL programmers write self-modifying code.

On Wed, 17 Sep 2003 17:02:32 GMT, Dave Stallard
wrote:

Mike Jacoubowsky wrote:

What about on the DuraAce? I have a DA triple fdr and I *think* I have a
working trim??? Either that, or something needs adjusting possibly.

Sorry, didn't want to confuse the original poster by pointing out that
DuraAce triple has "trim" on all three chainrings, while the rest of the
line only has it on the smaller two. So yes, you have even more "trim" than
the others.

Does this work well enough so that you don't get chain-to-cage rub in
any of the 3x9 gear combinations, even the cross-chain ones like largest
chainring to large rear cog, or smallest chainring to smallest rear
cog? I don't use these, but I'm thinking about Dura-Ace triple for my
next bike, and I would like to *eliminate* chain rub entirely if I'm
going to be laying out that kind of $$$. I hate chain rub.

ride down-tube friction shifters...!

*ducks*

-Luigi


Dave

"Mike Jacoubowsky" wrote in message
.com...
What about on the DuraAce? I have a DA triple fdr and I *think* I have
a
working trim??? Either that, or something needs adjusting possibly.

Sorry, didn't want to confuse the original poster by pointing out that
DuraAce triple has "trim" on all three chainrings, while the rest of the
line only has it on the smaller two. So yes, you have even more "trim"
than
the others.

Whew!

Thanks

The trimming function is a capability of the left shifter and not the
front derailleur. FD's are designed to work over a smooth range,
without intermediate stops.
Dura-Ace triple shifters DO have a trimming capability. I use it
daily. The shifter might have a different number of trim positions
than other Shimano models. Not that this matters, in my experience.
There is a related thread on this subject recently on
rec.bicyles.tech.

r.b.

"Gary Mishler" wrote in message news:fkX9b.486975$uu5.83706@sccrnsc04...
"Mike Jacoubowsky" wrote in message
...

The "trim" function on nearly all Shimano triple road groups (with the
exception of DuraAce and Sora) works the same way.

What about on the DuraAce? I have a DA triple fdr and I *think* I have a
working trim??? Either that, or something needs adjusting possibly.

Why would not there be a trim on DA, but there is on others?

Thanks,
Mish

Sorry, didn't want to confuse the original poster by pointing out that
DuraAce triple has "trim" on all three chainrings, while the rest of the
line only has it on the smaller two. So yes, you have even more "trim"
than
the others.

Whew!

Is that a reference to the movie "48 Hours?"

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

"Gary Mishler" wrote in message
news:rS3ab.486312$YN5.329493@sccrnsc01...

"Mike Jacoubowsky" wrote in message
.com...
What about on the DuraAce? I have a DA triple fdr and I *think* I
have
a
working trim??? Either that, or something needs adjusting possibly.

Sorry, didn't want to confuse the original poster by pointing out that
DuraAce triple has "trim" on all three chainrings, while the rest of the
line only has it on the smaller two. So yes, you have even more "trim"
than
the others.

Whew!

Thanks