Campy Compact Report

Cat Dailey said:

I put on the new Record compact crank (34-50), bottom bracket, and compact
specific front derailleur. VOILA! Great chainline, perfect shifting across
all the gears without chainrub anywhere (even cross-chained), and I CANNOT
get the darned chain to fall off (I am curious to know if you can pick it
back up with the front derailleur, since I couldn't with the FSA setup...I'd
have to get off of the bike to do it).

I'd like to guess that if you took the Campy 50t ring and put it on
the FSA cranks, that the chain would not drop either. I don't think
that the front derailleur would pick up the dropped chain either.
That's easy enough to test.

I'm guessing that the placement and length of the shift pins on the
FSA ring are the culprit in both the ring being rubbed when crossed
with the small ring and hanging onto the chain for a fraction of a
second too long.

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

Quoted message said:

Cat Dailey said:

I put on the new Record compact crank (34-50), bottom bracket, and

compact

Quoted message said:

Quoted message said:

specific front derailleur. VOILA! Great chainline, perfect shifting

across

Quoted message said:

Quoted message said:

all the gears without chainrub anywhere (even cross-chained), and I

CANNOT

Quoted message said:

Quoted message said:

get the darned chain to fall off (I am curious to know if you can pick it
back up with the front derailleur, since I couldn't with the FSA

setup...I'd

Quoted message said:

Quoted message said:

have to get off of the bike to do it).

I'd like to guess that if you took the Campy 50t ring and put it on
the FSA cranks, that the chain would not drop either. I don't think
that the front derailleur would pick up the dropped chain either.
That's easy enough to test.

I'm guessing that the placement and length of the shift pins on the
FSA ring are the culprit in both the ring being rubbed when crossed
with the small ring and hanging onto the chain for a fraction of a
second too long.

Nope, it was the chainline. FSA acknowledged as much and said it was "a
problem" with short chainstay bikes like mine. For some reason, the drive
side crank sits too far away from the bb.

Cat

Cat Dailey said:

For those of you who are interested in how the Campy Record Compact
with compact front derailleur works:

I had an FSA bottom bracket and FSA compact crank with regular Record
front derailleur. As many others here experienced, the chain would
often drop off to the inside, despite many, many adjustments. Also,
I could not use the 34-23 combination without having bad chainrub.
FSA told me that my short chainstays were to blame for the crappy
chainline and that they didn't have a solution.

I put on the new Record compact crank (34-50), bottom bracket, and
compact specific front derailleur. VOILA! Great chainline, perfect
shifting across all the gears without chainrub anywhere (even
cross-chained), and I CANNOT get the darned chain to fall off (I am
curious to know if you can pick it back up with the front derailleur,
since I couldn't with the FSA setup...I'd have to get off of the bike
to do it).

While I think the FSA carbon crank is more aesthetically pleasing
than the Record one, I just had to have better performance.

I wonder if there's a difference in chainline between these two setups. Have
you measured it? Perhaps the FSA would have worked better with a different BB,
giving the same chainline as the Campy.

Matt O.

"Matt O'Toole" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Cat Dailey said:

For those of you who are interested in how the Campy Record Compact
with compact front derailleur works:

I had an FSA bottom bracket and FSA compact crank with regular Record
front derailleur. As many others here experienced, the chain would
often drop off to the inside, despite many, many adjustments. Also,
I could not use the 34-23 combination without having bad chainrub.
FSA told me that my short chainstays were to blame for the crappy
chainline and that they didn't have a solution.

I put on the new Record compact crank (34-50), bottom bracket, and
compact specific front derailleur. VOILA! Great chainline, perfect
shifting across all the gears without chainrub anywhere (even
cross-chained), and I CANNOT get the darned chain to fall off (I am
curious to know if you can pick it back up with the front derailleur,
since I couldn't with the FSA setup...I'd have to get off of the bike
to do it).

While I think the FSA carbon crank is more aesthetically pleasing
than the Record one, I just had to have better performance.

I wonder if there's a difference in chainline between these two setups.

Have

Quoted message said:

you measured it? Perhaps the FSA would have worked better with a

different BB,

Quoted message said:

giving the same chainline as the Campy.

Matt O.

Maybe, but I used the FSA bb that was supposed to go with the FSA crank.
Some people have suggested that the chainline is supposed to be identical,
but even I could see that the drive side crank sat further away from the
frame on the FSA cranks than the campy cranks.

Cat

Cat Dailey said:

Maybe, but I used the FSA bb that was supposed to go with the FSA
crank. Some people have suggested that the chainline is supposed to
be identical, but even I could see that the drive side crank sat
further away from the frame on the FSA cranks than the campy cranks.

So they're trying to blame it on your frame, when they've moved the chainline
further out. They need to revise their BB axle length. Their fault.

Matt O.

Matt O'Toole said:

Cat Dailey said:

Maybe, but I used the FSA bb that was supposed to go with the FSA
crank. Some people have suggested that the chainline is supposed to
be identical, but even I could see that the drive side crank sat
further away from the frame on the FSA cranks than the campy

cranks.

Quoted message said:

So they're trying to blame it on your frame, when they've moved the

chainline

Quoted message said:

further out. They need to revise their BB axle length. Their fault.

Matt O.

I'm pretty sure that the FSA cranks mentioned by Cat are designed
around the ISIS standard - 108mm BB. If I understand the ISIS
licensing agreement correctly, in order to comply, you need to conform
- redesigning the BB is not an option. Curiously, ISTR that the
chainline is also part of the standard (but I am very likely mistaken
in this).

SYJ

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

Quoted message said:

For those of you who are interested in how the Campy Record Compact with
compact front derailleur works:

I had an FSA bottom bracket and FSA compact crank with regular Record

front

Quoted message said:

derailleur. As many others here experienced, the chain would often drop

off

Quoted message said:

to the inside, despite many, many adjustments. Also, I could not use the
34-23 combination without having bad chainrub. FSA told me that my short
chainstays were to blame for the crappy chainline and that they didn't

have

Quoted message said:

a solution.

I put on the new Record compact crank (34-50), bottom bracket, and compact
specific front derailleur. VOILA! Great chainline, perfect shifting

across

Quoted message said:

all the gears without chainrub anywhere (even cross-chained), and I CANNOT
get the darned chain to fall off (I am curious to know if you can pick it
back up with the front derailleur, since I couldn't with the FSA

setup...I'd

Quoted message said:

have to get off of the bike to do it).

While I think the FSA carbon crank is more aesthetically pleasing than the
Record one, I just had to have better performance.

Cat
who is thrilled that it was SIXTY DEGREES near Philly today after having
ridden tow or three times in the twenties in the last week ;>

I'm looking to get a Campy setup but using the FSA Compact Cranks instead of
the Campy ones because of lower cost that FSA adheres to the 110 BCD
standard. I was speaking with the guy from www.GVHbikes.com and he told me
they have tried the new Campy compact front deraileur with the FSA SL-K
Compact Megaexo, and it didn't work well at all. They were strongly
recommending using the regular Campy front derailuer. I believe the Megaexo
is an entirely different setup than ISIS, so that may create a difference as
well.

Quoted message said:

I'm pretty sure that the FSA cranks mentioned by Cat are designed
around the ISIS standard - 108mm BB. If I understand the ISIS
licensing agreement correctly, in order to comply, you need to conform
- redesigning the BB is not an option. Curiously, ISTR that the
chainline is also part of the standard (but I am very likely mistaken
in this).

I'm a bit suspect of FSA. Their square taper crank needed a "103" bb.
People were searching around for the Shimano 103 JIS, which became
almost unobtainium, and used 107 JIS. At the crank hole on the back
of the crank were the letters, ISO. Turns out a Campy 102 bb was a
perfect match. The cranks were 130 bolt pattern but I think they came
in 135 also.

I wonder how much retooling that they did when they went for a 108
ISIS fitting?

Cat Dailey said:

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

Quoted message said:

Cat Dailey said:

I put on the new Record compact crank (34-50), bottom bracket, and

compact

Quoted message said:

Quoted message said:

specific front derailleur. VOILA! Great chainline, perfect shifting

across

Quoted message said:

Quoted message said:

all the gears without chainrub anywhere (even cross-chained), and I

CANNOT

Quoted message said:

Quoted message said:

get the darned chain to fall off (I am curious to know if you can pick it
back up with the front derailleur, since I couldn't with the FSA

setup...I'd

Quoted message said:

Quoted message said:

have to get off of the bike to do it).

I'd like to guess that if you took the Campy 50t ring and put it on
the FSA cranks, that the chain would not drop either. I don't think
that the front derailleur would pick up the dropped chain either.
That's easy enough to test.

I'm guessing that the placement and length of the shift pins on the
FSA ring are the culprit in both the ring being rubbed when crossed
with the small ring and hanging onto the chain for a fraction of a
second too long.

Nope, it was the chainline. FSA acknowledged as much and said it was "a
problem" with short chainstay bikes like mine. For some reason, the drive
side crank sits too far away from the bb.

Cat

Thanks for the posting... I have had the problem w/ the chain dropping
off the inside as well. I am running the FSA carbon compact crank w/ the
FSA Platinum BB (108)on a meduim Giant TCR frame (short chainstay). I
just put the Campy compact specific front derraileur on and the shifting
appears to be much better and the chain has yet to drop. I will be
making a longer ride over the weekend to make sure. The trimming of the
derraileur when on the large chain ring appears to be a bit more
finicky, but I may need to make an adjustment here.