Triple Front Der Rub

BarryG' bg at albany.net said:

I'm running an Ultegra triple setup and getting chain rub in the lowest gear (small chainring/large
sprocket) with the braze-on FD adjusted to the limit. Would appreciate advice - is it possible to
shim out the crank a couple of mm? Use a Campy FD (they seem to swing closer to the frame)? Live
with the noise on steep climbs? . . .

Thanks, Barry

Check to see what prevents the derailer from moving inward more. On some derailers there is a small
bump in the casting which serves as a stop. I have had sucess using a dremel tool to grind this down
and gain a littel more inward travel.

Alternatively, you could get a shim for the BB.

Bob

Barry-<< I'm running an Ultegra triple setup and getting chain rub in the lowest gear (small
chainring/large sprocket) with the braze-on FD adjusted to the limit.

Big seattube is my guess(34.9mm diameter?). Unfortunately, not a lot you can
do. I wouldn't move the BB to the right, it will affect your chainline adversly and make your crank
arms offcenter.

Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302
(303)440-3535 vecchios.comvecchios.comOpen ↗ "Ruote convenzionali costruite eccezionalmente bene"

Qui si parla Campagnolo said:

Barry-<< I'm running an Ultegra triple setup and getting chain rub in the lowest gear (small
chainring/large sprocket) with the braze-on FD adjusted to the limit.

Big seattube is my guess(34.9mm diameter?). Unfortunately, not a lot you can
do. I wouldn't move the BB to the right, it will affect your chainline adversly and make your
crank arms offcenter.

Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302
(303)440-3535 vecchios.comvecchios.comOpen ↗ "Ruote convenzionali costruite eccezionalmente bene"

Yes, shimming it'll do the above. But, if it shifts and doesn't rub -- what's the problem? I'd try
it -- assuming that he has enough threads to do so safely -- that'd be my worry.

David

BarryG said:

I'm running an Ultegra triple setup and getting chain rub in the lowest gear (small
chainring/large sprocket) with the braze-on FD adjusted to the limit. Would appreciate advice - is
it possible to shim out the crank a couple of mm? Use a Campy FD (they seem to swing closer to the
frame)? Live with the noise on steep climbs? . . .

Thanks, Barry

You may be able to cure it by carefully bending the cage.

Barry

Quoted message said:

I'm running an Ultegra triple setup and getting chain rub in the lowest gear

Quoted message said:

(small chainring/large sprocket) with the braze-on FD adjusted to the

limit.

Barry,

You might take a look at the tension on your front derailleur cable. If there isn't enough slack the
"low end stop will not be allowed to adjust to its limit causing the problem you mentioned. Also
check to make sure the inner cage plate is parallel to the chain.

Jim Toth