Gear Question ( 9 speed )

I have a Road bike, with 9 speed Shimano 105 group set.

Coming from a cheap bike, I wanted to ask about the gears.

Can I use all the gears ?
Ie the big front ring to the smallest rear ring ?

Does this stuff the chain big time or what ?

What should I set as the limits ?

............
Thankyou kindly for much needed advice.

Robbie Hewson Wrote:
I have a Road bike, with 9 speed Shimano 105 group set.

Coming from a cheap bike, I wanted to ask about the gears.

Can I use all the gears ?
Ie the big front ring to the smallest rear ring ?

Does this stuff the chain big time or what ?

What should I set as the limits ?

............
Thankyou kindly for much needed advice.

Depending on the trimming of the derailers, you may find that you can't
use all of the ratios. Specifically, the chain might rub against the
front derailer in either or both of the large/large and small/small
combinations because the chain-line becomes less straight when viewed
from above. The large/small combination should be fine if set up
correctly.

As for my own set-up, I like to use 7 out of the 9 in each front ring
so there is plenty of overlap.

Ritch


--
ritcho

ritcho Wrote:
Depending on the trimming of the derailers, you may find that you can't
use all of the ratios. Specifically, the chain might rub against the
front derailer in either or both of the large/large and small/small
combinations because the chain-line becomes less straight when viewed
from above. The large/small combination should be fine if set up
correctly.

As for my own set-up, I like to use 7 out of the 9 in each front ring
so there is plenty of overlap.

Ritch
avoid if you can the big-big, and small-small combos. chainline is too
extreme andyour derailleur aint gonna like that big-big one


--
flyingdutch

"flyingdutch" wrote in
message ...

ritcho Wrote:
Depending on the trimming of the derailers, you may find that you can't
use all of the ratios. Specifically, the chain might rub against the
front derailer in either or both of the large/large and small/small
combinations because the chain-line becomes less straight when viewed
from above. The large/small combination should be fine if set up
correctly.

As for my own set-up, I like to use 7 out of the 9 in each front ring
so there is plenty of overlap.

Ritch
avoid if you can the big-big, and small-small combos. chainline is too
extreme andyour derailleur aint gonna like that big-big one


--
flyingdutch




Sometimes you might end up going big to big but it's better to change chain
rings before that happens. As the others said, it's not desireable, but at
the same time it won't cause your bike to self destruct. As long as the
chain is not too short things will be ok.

Marty

Sometimes you might end up going big to big but it's better
to change chain rings before that happens. As the others said,
it's not desireable, but at the same time it won't cause your
bike to self destruct. As long as the chain is not too short
things will be ok.

And the standard argument is also that small-small must be
avoided at all costs, because it has the highest chain-to-tooth
contact pressure, and hence will cause rapid wear. But ask
for data supporting that, even from guru Sheldon, and you'll
get zip. Personally, I doubt there is really much in it.

But then, my road bike has gears that were probably made by
Brinell himself.

Glen F Wrote:
Sometimes you might end up going big to big but it's better
to change chain rings before that happens. As the others said,
it's not desireable, but at the same time it won't cause your
bike to self destruct. As long as the chain is not too short
things will be ok.

And the standard argument is also that small-small must be
avoided at all costs, because it has the highest chain-to-tooth
contact pressure, and hence will cause rapid wear. But ask
for data supporting that, even from guru Sheldon, and you'll
get zip. Personally, I doubt there is really much in it.

But then, my road bike has gears that were probably made by
Brinell himself.
shimano is fairly notorius for front derailleur noise in the
small-small combo.
Of course such things NEVER happen with campag! (yeah, right!)


--
flyingdutch

"Glen F" wrote in message
...

But then, my road bike has gears that were probably made by
Brinell himself.



Who is Brinell?

Marty

Marty Wallace Wrote:
Who is Brinell?


J.A. Brinell

http://www.instron.com/applications/...ss/brinell.asp


--
aeek

"Glen F" wrote in message

Sometimes you might end up going big to big but it's better
to change chain rings before that happens. As the others said,
it's not desireable, but at the same time it won't cause your
bike to self destruct. As long as the chain is not too short
things will be ok.

And the standard argument is also that small-small must be
avoided at all costs, because it has the highest chain-to-tooth
contact pressure, and hence will cause rapid wear. But ask
for data supporting that, even from guru Sheldon, and you'll
get zip. Personally, I doubt there is really much in it.

It's one of those old ideas that just won't die. It comes from the Good Old
Days when your average 10-speed was bleeding edge. It's much, much less of
an issue with modern drivetrains.

--

A: Top-posters.
Q: What is the most annoying thing on Usenet?

DRS Wrote:
"Glen F" wrote in message
It's one of those old ideas that just won't die. It comes from the
Good Old
Days when your average 10-speed was bleeding edge. It's much, much
less of
an issue with modern drivetrains.

--

A: Top-posters.
Q: What is the most annoying thing on Usenet?

Have you asked your poor old chain that? "Owww, sideplate friction
(wear) increasing as it comes off the chainring!!! angular load on the
pins increasing!!! WHAT?!?!?! you want to SPRINT in that gear?!?!?!
AAAGGGHHHHH!!!!! POP!"

Neutral chainline (i.e. no bend) falls ideally between 4 and 6 (8/9/10
spd)at the back (hypothetical chainline between chainrings). You have
deflection of about 22mm from this to top cog on 9 speed. Add about 4mm
for small/small combo, and you've got about 26 mm of deflection - over
410mm average chainstay length. With two significant friction points
where the chain bends. On 650C triple c/set bikes I have built with
x-short chainstays, I tell the owners definitely NOT to load up the
small/small gear combo, or at least take a chain tool with them to
salvage the inevitable breakage.

M"singlespeeds don't mess my head"H


--
mfhor