1x9 or 1x10 setup

Quoted message said:

Hi all,

In the spirit of "more is NOT always better" I'm considering removing
my front derailleur and replacing my DuraAce 7410 series 8-speed cranks
with my Campy Record track crank. I'll be running my DuraAce 9-speed
rear setup for now. I have two basic questions:

Are there any issues with chainline? Does anyone know what BB spindle
length to use to get the best chainline?

The matching bottom bracket for the Record Pista crank has a 111 mm.
spindle with ISO tapers and symmetrical overhangs. The resulting
chainline is approximately 43 mm from the bike's centerline. Depending
upon the length/shape of your road frame's chainstays, chainring size
and dropout spacing, you may or may not have enough clearance between
the crank spider and/or chainring to accommodate this chainline
specification.

Quoted message said:

Will there be any issues with throwing the chain? If so, does anyone
know of any minimal, elegant solutions?

I don't know how to quantify the additional likelihood of chain
deraillment, but anecdotally there seems to be a greater chance of it
happening. Perhaps you'll be lucky and it won't be a significant
problem. The best solution of course is to restore the front
derailleur to serve as a chain keeper, but that'll compromise your
styling affectation.

-------------------------------
John Dacey
Business Cycles, Miami, Florida
http://www.businesscycles.com
Since 1983
Our catalog of track equipment: online since 1996
-------------------------------

Quoted message said:

Hi all,

In the spirit of "more is NOT always better" I'm considering removing
my front derailleur and replacing my DuraAce 7410 series 8-speed cranks
with my Campy Record track crank. I'll be running my DuraAce 9-speed
rear setup for now. I have two basic questions:

Are there any issues with chainline? Does anyone know what BB spindle
length to use to get the best chainline?

Will there be any issues with throwing the chain? If so, does anyone
know of any minimal, elegant solutions? (I've considered and decided
against using a TA 'cross-style crank with it's two chain guards.)

Thanks,

Rob

Rob:

I have used all the gears in my 9 speed cassette with my 52 teeth
chainring. So, technically, while not ideal, one chainring will be able
to work with all sprokets. However, the chain and some of the sprokets
will get more wear when the chainline is too angled.

As, John suggested, you do need to keep the front deraullier to work as
a chain guide. Otherwise, you'll probably end up dropping your chain a
lot.

Andres

Quoted message said:

Hi all,

In the spirit of "more is NOT always better" I'm considering removing
my front derailleur and replacing my DuraAce 7410 series 8-speed cranks
with my Campy Record track crank. I'll be running my DuraAce 9-speed
rear setup for now. I have two basic questions:

Are there any issues with chainline? Does anyone know what BB spindle
length to use to get the best chainline?

Will there be any issues with throwing the chain? If so, does anyone
know of any minimal, elegant solutions? (I've considered and decided
against using a TA 'cross-style crank with it's two chain guards.)

From:

http://sportsillustrated.cnn.com/cycling/news/2003/07/06/millar_prologue/

an offhand estimate of 6.5 k/derailment, approx.

"They called him Stumpy" --D-y

In article <[email hidden]>,

John Dacey said:

Quoted message said:

Hi all,

In the spirit of "more is NOT always better" I'm considering removing
my front derailleur and replacing my DuraAce 7410 series 8-speed cranks
with my Campy Record track crank. I'll be running my DuraAce 9-speed
rear setup for now. I have two basic questions:

Quoted message said:

Quoted message said:

Will there be any issues with throwing the chain? If so, does anyone
know of any minimal, elegant solutions?

I don't know how to quantify the additional likelihood of chain
deraillment, but anecdotally there seems to be a greater chance of it
happening. Perhaps you'll be lucky and it won't be a significant
problem. The best solution of course is to restore the front
derailleur to serve as a chain keeper, but that'll compromise your
styling affectation.

David Millar would probably cite a chain derailment due to not running a
front derailer as his second-worst experience as a pro cyclist.

It is a rather extreme case owing to the short chainstays, but my 1x7
BMX project is quite enthusiastic about dropping the chain unless I run
a front derailer as a guide.

One thing that might work is a chain watcher on the inside...

http://www.rei.com/product/9610812.htm
http://www.bikemannetwork.com/biking/p/CH5800

....but you may have to run a chain guard on the outside to prevent the
chain from falling off.

If you're really determined to run an aesthetically uncompromised setup,
I'd consider trying something wacky like running a chain watcher and a
single large ring that is spaced as far outboard as possible. Of course,
this will mess up your chainline for the inside cogs.

--
Ryan Cousineau [email hidden] http://www.wiredcola.com/
"I don't want kids who are thinking about going into mathematics
to think that they have to take drugs to succeed." -Paul Erdos

Quoted message said:

Hi all,

In the spirit of "more is NOT always better" I'm considering removing
my front derailleur and replacing my DuraAce 7410 series 8-speed cranks
with my Campy Record track crank. I'll be running my DuraAce 9-speed
rear setup for now. I have two basic questions:

Are there any issues with chainline? Does anyone know what BB spindle
length to use to get the best chainline?

109mm iso taper

Quoted message said:

Will there be any issues with throwing the chain? If so, does anyone
know of any minimal, elegant solutions? (I've considered and decided
against using a TA 'cross-style crank with it's two chain guards.)

yes, lots if you are going to use a rear derailleur. Also, 144mm BCD
and road ring instead of track ring, I hope. use a third eye type chain
watcher and a a front der or a guard to hold the chain on.

Quoted message said:

Thanks,

Rob

Quoted message said:

Hi all,

In the spirit of "more is NOT always better" I'm considering removing
my front derailleur and replacing my DuraAce 7410 series 8-speed cranks
with my Campy Record track crank. I'll be running my DuraAce 9-speed
rear setup for now. I have two basic questions:

Are there any issues with chainline? Does anyone know what BB spindle
length to use to get the best chainline?

Measure the distance from the centre line of the bike to the 5th
sprocket. This is the chainline you want. The Campag track crank, on
the short BB it's designed for, will probably give a track-standard
chainline of 42mm, so this should tell you how much longer the BB needs
to be.

Quoted message said:

Will there be any issues with throwing the chain? If so, does anyone
know of any minimal, elegant solutions? (I've considered and decided
against using a TA 'cross-style crank with it's two chain guards.)

There is a definite risk of throwing the chain under the light spring
tension of a modern rear derailleur, coupled with the more extreme chain
angle than, say, the 1x5 setup we rode as kids. Just ask David Millar.
I would either leave the FD in place or buy one of the "chain
watcher" devices.

Quoted message said:

Hi all,

In the spirit of "more is NOT always better" I'm considering removing
my front derailleur and replacing my DuraAce 7410 series 8-speed cranks
with my Campy Record track crank. I'll be running my DuraAce 9-speed
rear setup for now. I have two basic questions:

I did this last year on my commuter bike. Now I run a single DT lever
and read der. only.

I don't know how many teeth are on your DA big or small rings v. the
Campy single ring, but if either of the two DA rings are close to what
you want' the following may be an option.

Move the large chainring on the existing DuraAce cranks to the smaller
side of the spider (or middle position if this is a triple, which is
unlikely), or remove the large ring and use the small only. Use
shorter stack bolts to hold the one remaining ring there. Seemed to
work better for me with the one ring in the small ring position, rather
than the big ring position.

Quoted message said:

Are there any issues with chainline? Does anyone know what BB spindle
length to use to get the best chainline?

If you do the above, you won't need to change the current BB arangement
at all.

Quoted message said:

Will there be any issues with throwing the chain? If so, does anyone
know of any minimal, elegant solutions? (I've considered and decided
against using a TA 'cross-style crank with it's two chain guards.)

Yep, and it can be b****y dangerous too. Didn't seem to be related to
shifting, or to being in the top or bottom of the casette at the back -
just threw the chain from time to time.
However, I was running road rings, which are designed (ramps, pins
etc.) to pick up and throw the chain quickly and easily. You may have
a better time with the track ring on the Campy cranks. On the other
hand, the track ring may be cut to work really well with a dead
straight chainline and taut chain (per a track bike), and may be lousy
with the looser chain tension and offset chain line on the 1x9.
Probably gotta try it to find out...

I ended up buying two cheap clear plastic chainguards, and fitting them
back to back around the remaining chainring. Worked a charm, and as it
happened, soaked up the extra length in my existing tower bolts, so it
turned out to be a really cheap (2x€3 for the chainguards) and lazy
(didn't even have to pull the crank, never mind the bottom bracket)
solution. Looks OK too.

Quoted message said:

Thanks,

Rob

Just throwing out an option for consideration, HTH,

bookieb.

Quoted message said:

Hi all,

In the spirit of "more is NOT always better" I'm considering removing
my front derailleur and replacing my DuraAce 7410 series 8-speed cranks
with my Campy Record track crank. I'll be running my DuraAce 9-speed
rear setup for now. I have two basic questions:

Are there any issues with chainline? Does anyone know what BB spindle
length to use to get the best chainline?

Will there be any issues with throwing the chain? If so, does anyone
know of any minimal, elegant solutions? (I've considered and decided
against using a TA 'cross-style crank with it's two chain guards.)

http://www.peterwhitecycles.com/Cyclo-Cross.htm

You could keep your D-race crank. Looks kinda slick IMHO, and people
might ask how it works with no teeth <g>! Two 'rings plus longer bolts
worth of add'l weight. A slight overall gain (loss) with missing front
der. factored in? --D-y

Quoted message said:

Hi all,

In the spirit of "more is NOT always better" I'm considering removing
my front derailleur and replacing my DuraAce 7410 series 8-speed cranks
with my Campy Record track crank. I'll be running my DuraAce 9-speed
rear setup for now. I have two basic questions:

Are there any issues with chainline? Does anyone know what BB spindle
length to use to get the best chainline?

Will there be any issues with throwing the chain? If so, does anyone
know of any minimal, elegant solutions? (I've considered and decided
against using a TA 'cross-style crank with it's two chain guards.)

http://www.peterwhitecycles.com/Cyclo-Cross.htm

You could keep your D-race crank. Looks kinda slick IMHO, and people
might ask how it works with no teeth <g>! Two 'rings plus longer bolts
worth of add'l weight. A slight overall gain (loss) with missing front
der. factored in? --D-y