Unusable gear combinations on a triple/9 setup?

I forgot to mention that I'm getting a 30-42-52 front, and either a 13-23 or 13-25 rear.

--
Kovie [email hidden]

"Kovie" <[email hidden]> wrote in message news:EEikb.587911$cF.256907@rwcrnsc53...

Quoted message said:

I'm sure that this is a very common question but I can't seem to find an answer to it. I'm
building up a new road bike with triple front/9 rear gearing. Are there any combinations of gears
that are either impossible,

or

Quoted message said:

at least unrecommended due to excessive chain flex, derailleur rub or

wear,

Quoted message said:

chainstay rub, etc.? I know that on my old 2x7 road bike the extreme combinations were effectively
unusable, but I'm wondering how this works with a 3x9.

Also, does it make a difference as to which make and model of cranks, cassette, chain and
derailleurs one uses? I'm most likely going to go with Shimano Ultergras, but there's a chance
I'll go with Campy Chorus or Centaur.

If there are online resources that answer this sort of question, that

would

Quoted message said:

be great too.

Thanks!

--
Kovie [email hidden]

Quoted message said:

From: "Kovie"

Quoted message said:

If there are online resources that answer this sort of question, that would

Quoted message said:

be great too

<groups.google.comgroups.google.comOpen ↗ >

Looking at "triple chainrings" in a search of rec.bicycles.tech:

<groups.google.comgroupsOpen ↗
ch&hl=en&lr=&ie=UTF-8&group=rec.bicycles.tech&scoring=d>

for starters. ("Arrange by date"😉

Suggest you chart out your prospective gears, compare to your experience with what ratios
you've used.

Campy levers are rebuildable, Ultegra not. The biggest "Italy v. Japan" difference in use is the
actuating lever arrangement. It might be a good idea to try out both to see which one you like best
if you haven't yet done so.

The idea of not running a crossed-over chain remains the same. You'll have more usable gears, and
more "duplicates" or combinations that are close to the same gear ratio. --Tom Paterson

"Kovie" <[email hidden]> wrote in message news:EEikb.587911$cF.256907@rwcrnsc53...

Quoted message said:

I'm sure that this is a very common question but I can't

seem to find an

Quoted message said:

answer to it. I'm building up a new road bike with triple

front/9 rear

Quoted message said:

gearing. Are there any combinations of gears that are

either impossible, or

Quoted message said:

at least unrecommended due to excessive chain flex,

derailleur rub or wear,

Quoted message said:

chainstay rub, etc.? I know that on my old 2x7 road bike

the extreme

Quoted message said:

combinations were effectively unusable, but I'm wondering

how this works

Quoted message said:

with a 3x9.

Also, does it make a difference as to which make and model

of cranks,

Quoted message said:

cassette, chain and derailleurs one uses? I'm most likely

going to go with

Quoted message said:

Shimano Ultergras, but there's a chance I'll go with Campy

Chorus or

Quoted message said:

Centaur.

If there are online resources that answer this sort of

question, that would

Quoted message said:

be great too.

Stay away from extremes - big/big and small/small - you may be able to use them if your bike is set
up properly, but not recommended because of increased wear.

Shimano nine speed triples have a 'trim' position between granny and middle, so you can use
pretty well the whole range in the middle ring, and all but one or two of the small sprockets in
the granny.

Don't know a lot about Campagnolo, but I believe the front shifter provides multiple trim positions.

There's an excellent gear-inch and shifting pattern calculator at http://www.panix.com/~jbarrm/cycal/cycal.30f.html
which will show you your best progression through your ratios, particularly where there's overlap or very small difference between ratios. I understand the extremes where ahain is "crossed" are a bit more pronounced with a triple and are to be avoided.

Quoted post said:

Originally posted by Kovie
I'm sure that this is a very common question but I can't seem to find an answer to it. I'm building
up a new road bike with triple front/9 rear gearing. Are there any combinations of gears that are
either impossible, or at least unrecommended due to excessive chain flex, derailleur rub or wear,
chainstay rub, etc.? I know that on my old 2x7 road bike the extreme combinations were effectively
unusable, but I'm wondering how this works with a 3x9.

Also, does it make a difference as to which make and model of cranks, cassette, chain and
derailleurs one uses? I'm most likely going to go with Shimano Ultergras, but there's a chance I'll
go with Campy Chorus or Centaur.

If there are online resources that answer this sort of question, that would be great too.

Thanks!

--
Kovie [email hidden]

Thanks, but I've already written such a calculator for myself with MS Excel. All I really wanted to
know was which combos were to be avoided, not which combos were available.

--
Kovie [email hidden]

"armchair_spacem" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Kovie said:

I'm sure that this is a very common question but I can't seem to find

an

Quoted message said:

Quoted message said:

answer to it. I'm building up a new road bike with triple front/9 rear gearing. Are there any
combinations of gears that are either

impossible,

Quoted message said:

Quoted message said:

or at least unrecommended due to excessive chain flex, derailleur rub

or

Quoted message said:

Quoted message said:

wear, chainstay rub, etc.? I know that on my old 2x7 road bike the extreme combinations were
effectively unusable, but I'm wondering how this works with a 3x9. Also, does it make a
difference as to which make and model of cranks, cassette, chain and derailleurs one uses? I'm
most likely going to go with Shimano Ultergras, but there's a chance I'll go with Campy Chorus
or Centaur. If there are online resources that answer this sort of question, that would be
great too. Thanks!
--
Kovie [email hidden]

There's an excellent gear-inch and shifting pattern calculator at
panix.comcycal.30f.htmlOpen ↗ which will show you your best progression
through your ratios, particularly where there's overlap or very small difference between ratios. I
understand the extremes where ahain is "crossed" are a bit more pronounced with a triple and are
to be avoided.

--

Quoted message said:

--------------------------<

Posted via cyclingforums.com cyclingforums.comcyclingforums.comOpen ↗

Quoted post said:

Originally posted by Kovie
I'm sure that this is a very common question but I can't seem to find an answer to it. I'm building
up a new road bike with triple front/9 rear gearing. Are there any combinations of gears that are
either impossible, or at least unrecommended due to excessive chain flex, derailleur rub or wear,
chainstay rub, etc.? I know that on my old 2x7 road bike the extreme combinations were effectively
unusable, but I'm wondering how this works with a 3x9.

Also, does it make a difference as to which make and model of cranks, cassette, chain and
derailleurs one uses? I'm most likely going to go with Shimano Ultergras, but there's a chance I'll
go with Campy Chorus or Centaur.

If there are online resources that answer this sort of question, that would be great too.

Thanks!

--
Kovie [email hidden]

Given trim positions in the front shifter, and chainstays that aren't too short, all combinations could be usable.However you should not be in the samll/small or big/big, and as the granny ring is often considered a bailout there is really little need for several of the smallest cogs when in the granny. it does not maatter which brand you use,but stick with one manufacturer, although cranksets can be interchanged with the appropriate BB. I prefer Campy triple shifting as it uses a fine ratchet on the front shifter which allows more derailer trim and is less critical of adjustment than the shimano index system.

Kovie said:

All I really wanted to know was which combos were to be avoided, not which combos were available.

Depends on angle of chain - which depends on bike, chain stay length, bottom bracket, cranks,
wheels, etc - and on how much you dislike the friction the "bad" gears cause.

On my 9sp road triples, I tend to avoid:

- inner chainring with smallest 4 rear cogs
- middle with largest and smallest cogs (for long)
- outer with largest 3 or 4 cogs

~PB

Thanks. I'm leaning towards making is as all-Campy as possible, but my Shimano-compatible wheels
(Mavic Cosmos) require either a Shimano cassette, or a Shimano-Campy conversion cassette. None of
this should affect your advice, though, I assume.

--
Kovie [email hidden]

"boudreaux" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Kovie said:

I'm sure that this is a very common question but I can't seem to find

an

Quoted message said:

Quoted message said:

answer to it. I'm building up a new road bike with triple front/9 rear gearing. Are there any
combinations of gears that are either

impossible,

Quoted message said:

Quoted message said:

or at least unrecommended due to excessive chain flex, derailleur rub

or

Quoted message said:

Quoted message said:

wear, chainstay rub, etc.? I know that on my old 2x7 road bike the extreme combinations were
effectively unusable, but I'm wondering how this works with a 3x9. Also, does it make a
difference as to which make and model of cranks, cassette, chain and derailleurs one uses? I'm
most likely going to go with Shimano Ultergras, but there's a chance I'll go with Campy Chorus
or Centaur. If there are online resources that answer this sort of question, that would be
great too. Thanks!
--
Kovie [email hidden]

Given trim positions in the front shifter, and chainstays that aren't too short, all combinations
could be usable.However you should not be in the samll/small or big/big, and as the granny ring
is often considered a bailout there is really little need for several of the smallest cogs when
in the granny. it does not maatter which brand you use,but stick with one manufacturer, although
cranksets can be interchanged with the appropriate BB. I prefer Campy triple shifting as it uses
a fine ratchet on the front shifter which allows more derailer trim and is less critical of
adjustment than the shimano index system.

--

Quoted message said:

--------------------------<

Posted via cyclingforums.com cyclingforums.comcyclingforums.comOpen ↗