Long & short arm rear mechs

Also, for double shimano 105 chainrings, what length of BB axle would I need
(109.5?). Are all the splined shimano BB's (105, ultegra, do they do
tiagra?) interchangeable?

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

Quoted message said:

What problems might i have bodging together a 9 spd double ring shimano
road bike setup with a long arm rear mech?

Paul D said:

What problems might i have bodging together a 9 spd double ring
shimano road bike setup with a long arm rear mech?

No problems at all (as long as it's a Shimano mech). The longer cage
(arm) is to take up extra chain slack that results from from certain
triple or wide-range double gears. It doesn't matter if it's longer than
necessary.

~PB

Paul D vaguely muttered something like ...

Quoted message said:

What problems might i have bodging together a 9 spd double ring shimano
road bike setup with a long arm rear mech?

Shouldn't have any problems other than chain length. The longer arm is for
longer chains on some chainset combinations.

--
Paul ...
(8(|) Homer Rules !!!
http://www.4x4prejudice.org/index.php
"A [censored] is a [censored], no matter what mode of transport they're using."

Paul D said:

Also, for double shimano 105 chainrings, what length of BB axle would I need
(109.5?). Are all the splined shimano BB's (105, ultegra, do they do
tiagra?) interchangeable?

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

Quoted message said:

What problems might i have bodging together a 9 spd double ring shimano
road bike setup with a long arm rear mech?

No problems with the mech. My triple has 52/39/30 rings and works
perfectly on the 52/39, it doesn't know the 30 is there or not I
believe the Octalinks are interchangable, 105 and Ulty are. Ultegra 9sp
is completely interchangable with 105 9sp and it uses 109.5 for a double
chainset, something longer for triple, check the Shimano website to be sure.

Paul D <[email hidden]> wrote:
: What problems might i have bodging together a 9 spd double ring shimano road
: bike setup with a long arm rear mech?

None. Just leave the chain a little longer. This then means that if you
go somewhere really hilly you can bung a MTB 12-28 or 12-32 in to get some
low gears

Arthur

--
Arthur Clune PGP/GPG Key: http://www.clune.org/pubkey.txt
It is better to light a candle than to curse the darkness

in message <[email hidden]>, Paul D

(') said:

What problems might i have bodging together a 9 spd double ring
shimano road bike setup with a long arm rear mech?

None.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/

;; 'I think we should trust our president in every decision
;; that he makes and we should just support that'
;; Britney Spears of George W Bush, CNN 04:09:03

Paul - censored said:

Paul D vaguely muttered something like ...

Quoted message said:

What problems might i have bodging together a 9 spd double ring
shimano road bike setup with a long arm rear mech?

Shouldn't have any problems other than chain length.

That won't be a problem either. A longer mech doesn't need a longer
chain. The longer cage is to take up slack resulting from middle-ring to
smallest sprocket combination, for example, or even small-smalls.

Quoted message said:

The longer arm
is for longer chains on some chainset combinations.

No it's not really because the chain on double chainsets can be just as
long as chains used with long-cage mechs. Chain length is determined (or
should be, IMO) by the largest ring + largest sprocket combo.

~PB

I said:

the chain on double chainsets can be just
as long as chains used with long-cage mechs.

Note: That's not to imply that long cages aren't ever normally used for
double chainsets. They can be useful for wide-range doubles. I used one
with a double for years.

~PB

Pete Biggs said:

I said:

the chain on double chainsets can be just
as long as chains used with long-cage mechs.

Note: That's not to imply that long cages aren't ever normally used for
double chainsets. They can be useful for wide-range doubles. I used one
with a double for years.

~PB

Me too. (50/36 & 14-32)

MSeries said:

Pete Biggs said:

Note: That's not to imply that long cages aren't ever normally used
for double chainsets. They can be useful for wide-range doubles. I
used one with a double for years.

~PB

Me too. (50/36 & 14-32)

<AOL> (28/44 & 14-34)

--

Dave Larrington - http://www.legslarry.beerdrinkers.co.uk/
World Domination?
Just find a world that's into that kind of thing, then chain to the
floor and walk up and down on it in high heels. (Mr. Sunshine)

Pete Biggs vaguely muttered something like ...

Quoted message said:

Paul - censored said:

Paul D vaguely muttered something like ...

Quoted message said:

What problems might i have bodging together a 9 spd double ring
shimano road bike setup with a long arm rear mech?

Shouldn't have any problems other than chain length.

That won't be a problem either. A longer mech doesn't need a longer
chain. The longer cage is to take up slack resulting from middle-ring to
smallest sprocket combination, for example, or even small-smalls.

It will if the existing setup is already using a short-arm mech, which is
what it sounds like to me.

Quoted message said:

Quoted message said:

The longer arm
is for longer chains on some chainset combinations.

No it's not really because the chain on double chainsets can be just as
long as chains used with long-cage mechs. Chain length is determined (or
should be, IMO) by the largest ring + largest sprocket combo.

What if that chain length is normally used with a short-arm mech, and the
'bodger' (see OP) wants to use the same chainset, but wants to use a
long-arm mech in place of the short-arm?

That's how I see the scenario described, anyway.

--
Paul ...
(8(|) Homer Rules !!!
http://www.4x4prejudice.org/index.php
"A [censored] is a [censored], no matter what mode of transport they're using."

Paul D said:

What problems might i have bodging together a 9 spd double ring shimano road
bike setup with a long arm rear mech?

In an attempt to clairify the longer chain point.

You need to cut or extend the chain such that the mech, whatever you use
is in the correct position as defined in the instructions. Something
like: with the chain on big chainring, small sprocket the jockey wheel
centres and rear wheel centre should be vertically aligned. [CHECK THIS]
I usually find it much easier to have the jockey wheels verically
aligned and some distance in front of the wheel centre. You asked for
problems and this isn't really one.

Paul - censored said:

Pete Biggs vaguely muttered something like ...

Quoted message said:

Paul - censored said:

Paul D vaguely muttered something like ...
> What problems might i have bodging together a 9 spd double ring
> shimano road bike setup with a long arm rear mech?

Shouldn't have any problems other than chain length.

That won't be a problem either. A longer mech doesn't need a longer
chain. The longer cage is to take up slack resulting from
middle-ring to smallest sprocket combination, for example, or even
small-smalls.

It will if the existing setup is already using a short-arm mech,
which is what it sounds like to me.

No it won't. The usual advice for chain length calculation is the same
for both short and long cage mechs for the "add one link" method.

Quoted message said:

Quoted message said:

Quoted message said:

The longer arm
is for longer chains on some chainset combinations.

No it's not really because the chain on double chainsets can be just
as long as chains used with long-cage mechs. Chain length is
determined (or should be, IMO) by the largest ring + largest
sprocket combo.

What if that chain length is normally used with a short-arm mech, and
the 'bodger' (see OP) wants to use the same chainset, but wants to
use a long-arm mech in place of the short-arm?

The same chain length should do.

~PB

MSeries said:

In an attempt to clairify the longer chain point.

You need to cut or extend the chain such that the mech, whatever you
use
is in the correct position as defined in the instructions. Something
like: with the chain on big chainring, small sprocket the jockey
wheel centres and rear wheel centre should be vertically aligned.
[CHECK THIS]

That is one method but it's not the best, IMO. The Park Tools website
explains all the various methods. "Big-Big" is my favourite.

~PB

Pete Biggs <[email hidden]> wrote:

: The same chain length should do.

Indeed. I suggest using a slightly longer chain that one might with a
short cage mech since the longer cage will take the slack and it gives
more options for running big cassettes.

--
Arthur Clune PGP/GPG Key: http://www.clune.org/pubkey.txt
It is better to light a candle than to curse the darkness

Pete Biggs said:

MSeries said:

In an attempt to clairify the longer chain point.

You need to cut or extend the chain such that the mech, whatever you
use
is in the correct position as defined in the instructions. Something
like: with the chain on big chainring, small sprocket the jockey
wheel centres and rear wheel centre should be vertically aligned.
[CHECK THIS]

That is one method but it's not the best, IMO. The Park Tools website
explains all the various methods. "Big-Big" is my favourite.

~PB

It would be with a name like Biggs !!! How are you feeling today ?

in message <[email hidden]>, Pete Biggs

(') said:

I said:

the chain on double chainsets can be just
as long as chains used with long-cage mechs.

Note: That's not to imply that long cages aren't ever normally used
for
double chainsets. They can be useful for wide-range doubles. I used
one with a double for years.

Indeed. I use a 'medium cage' deraileur on my double, to give me the
option of a wide range cassette for hilly rides.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/

;; Semper in faecibus sumus, sole profundum variat.

Pete Biggs <[email hidden]> wrote:

: That is one method but it's not the best, IMO. The Park Tools website
: explains all the various methods. "Big-Big" is my favourite.

I used to use this method, but swapped to campag's new recommended method
of little-little and chain short enough so that the rear mech only just
takes up all the slack. THis gives a slightly longer chain that big-big
in many cases and I think it's improved my shifting.

Arthur

--
Arthur Clune PGP/GPG Key: http://www.clune.org/pubkey.txt
It is better to light a candle than to curse the darkness

Arthur Clune said:

Quoted message said:

That is one method but it's not the best, IMO. The Park Tools
website explains all the various methods. "Big-Big" is my favourite.

I used to use this method, but swapped to campag's new recommended
method of little-little and chain short enough so that the rear mech
only just takes up all the slack. THis gives a slightly longer chain
that big-big in many cases and I think it's improved my shifting.

That will improve perfomance and shifting in the big ring + bigger cogs.
That's fine except when pushing the mechs's capacity to and beyond the
limit, which I often do, hence my liking for having the chain as short as
I can reasonably get away with.

~PB